Has anybody ever stacked two CPU coolers?...

On Sun, 26 Jul 2020 17:25:16 +0100, Ricketty C <gnuarm.deletethisbit@gmail.com> wrote:

On Sunday, July 26, 2020 at 10:42:49 AM UTC-4, Commander Kinsey wrote:
On Sun, 26 Jul 2020 10:43:46 +0100, Martin Brown <\'\'\'newspam\'\'\'@nezumi.demon.co.uk> wrote:

On 25/07/2020 22:39, Commander Kinsey wrote:
On Sat, 25 Jul 2020 21:09:52 +0100, legg <legg@nospam.magma.ca> wrote:

Stacking CPU coolers will have a huge impedance mismatch on the second
one - essentially wasting most of its capability.

Since the heatpipes of each would be very close, the length of normal steel would be minimal.

WTF are you talking about \"normal steel\"???

I mean metal that isn\'t a heatpipe.

> Each heat pipe can only carry a small amount of heat, that\'s why they use many. Otherwise they would just use one pipe snaked along the fins.

I assumed snaking would be harder to make. Anyway since the original heatpipes are still almost as hot at the top as the bottom, I\'m sure they could carry more if the top of them was cooled by another heatsink.

It would be an odd construction - that had so much free real estate in
that particular direction, away from the heat source.

If you mean the computer case, it\'s not in one, the motherboard sits on
a bookshelf. It\'s a research machine sat in my garage made out of spare
parts, and no case was the right shape to fit a dual server board into.

It is antisocial to operate a fast PC outside an enclosure other than
for testing because it is a broadband emitter of RF interference to GHz.

I don\'t give a fuck. And that does explain why the monitor jumps a bit. There are 5 such open cased machines there. I wonder if that\'s why my neighbour has installed some kind of WiFi repeater in his garden :) Pissed him off without even trying!

You are starting to sound like a dick who used to post here under another name that I can\'t recall. What was it? You used to blow up stuff and get mad at the people who made it.

I set fire to a strimmer once. I haven\'t blown much up, unless you call smashing the spark plugs in a Renault engine \"blowing up\". All I did as overrev it, assuming that all modern cars had a rev limiter. but then the French are a bit lackadaisical.

You\'d get a better result with a bigger mounting interface to the heat
source,

Can\'t be done, the CPU is a specific size that cannot be changed.

You can get oversize heatsinks using heatpipes to shift more heat from
the CPU to the finned metal.

But the interface between the CPU and the block would be the same size - the area of the CPU.

Yes, you are very definitely not understanding what is going on. If the interface to the CPU was the limiting factor in heat conduction, then you would not get better performance by stacking your heat sinks either.

Bullshit. It\'s not as simple as traffic on a road, where one junction is the bottleneck and no changes to surrounding roads makes that junction any faster. If the interface to the CPU is limiting heat transfer, and say producing a temperature difference of 20C between the CPU and heatsink block, and then you make the heatsink colder by a bigger fan or a bigger heatsink, you could increase that 20C difference, causing more heat to flow through your so-called \"bottleneck\". Think of it like a garden hose, the width of the hose is limiting the water transfer. But if you increase the pressure, more gets through.

Larger fans are quieter too. If all else
fails water cool the thing which is what the serious overclockers do.

Expensive, hassle, leakages....

And serious overclockers use liquid nitrogen, or submerse the whole thing in oil!

So you just want to do something lame and pathetic?

I want to make it run cooler without expense or time.

coupling the heatpipes to it in parallel, rather in series,
or just by pushing more air.

Heatpipes only work if the temperature of the source exceeds a certain
level.

The top of the current single one feels pretty hot, so the bottom of the
new one would also be.

The way to cool it is use a larger heatsink designed to match the CPU
surface and use the right compound to make the best thermal joint.

I just replaced the fan with a faster one. Lost 20C. I\'d forgotten how shit some fans are. 1100rpm to 4000rpm!

Yeah, it\'s not uncommon for people to rush to a solution before they have all the facts. Still wanting to stack heat sinks?

I\'ll correct that for you, \"it\'s common for people....\" You do like to do things the longwinded way don\'t you? Stacking the heatsink was the easiest way to fix the problem.
 
On Sun, 26 Jul 2020 17:14:59 +0100, Ricketty C <gnuarm.deletethisbit@gmail.com> wrote:

On Sunday, July 26, 2020 at 5:43:51 AM UTC-4, Martin Brown wrote:
On 25/07/2020 22:39, Commander Kinsey wrote:
On Sat, 25 Jul 2020 21:09:52 +0100, legg <legg@nospam.magma.ca> wrote:


Stacking CPU coolers will have a huge impedance mismatch on the second
one - essentially wasting most of its capability.

A highly faulty analysis.

People often think the best match for power is equal impedance, but that is not the case when the impedance of the load is fixed.

It is in stereos.

In that case the lowest possible impedance in the supply provides for the optimum power transfer. That\'s why power supplies are designed with very low output impedances. Same thing here, only the guy is trying to optimize his costs, rather than ultimate effectiveness of the cooling.

I have no idea what his heat sinks look like or how he plans to attach them, but adding a second heat sink will most likely improve his cooling. The only question is by how much.

Ah so now you admit my idea was sensible.

> That can\'t be answered without more information. He talks about \"a\" heat pipe being near the top of the heat sink,

There\'s 4 running from the block through the fins to the top.

> but any one heat pipe has limited heat capacity, so still insufficient info.

The top is almost as hot as the bottom, the pipes are not a limiting factor.
 
On Sunday, July 26, 2020 at 1:01:31 PM UTC-4, Commander Kinsey wrote:
On Sun, 26 Jul 2020 17:25:16 +0100, Ricketty C <gnuarm.deletethisbit@gmail.com> wrote:

On Sunday, July 26, 2020 at 10:42:49 AM UTC-4, Commander Kinsey wrote:
On Sun, 26 Jul 2020 10:43:46 +0100, Martin Brown <\'\'\'newspam\'\'\'@nezumi..demon.co.uk> wrote:

On 25/07/2020 22:39, Commander Kinsey wrote:
On Sat, 25 Jul 2020 21:09:52 +0100, legg <legg@nospam.magma.ca> wrote:

Stacking CPU coolers will have a huge impedance mismatch on the second
one - essentially wasting most of its capability.

Since the heatpipes of each would be very close, the length of normal steel would be minimal.

WTF are you talking about \"normal steel\"???

I mean metal that isn\'t a heatpipe.

Each heat pipe can only carry a small amount of heat, that\'s why they use many. Otherwise they would just use one pipe snaked along the fins.

I assumed snaking would be harder to make. Anyway since the original heatpipes are still almost as hot at the top as the bottom, I\'m sure they could carry more if the top of them was cooled by another heatsink.

Did you measure? I\'m sure stacking heat sinks will improve the heat flow. The issue is how much. I expect it will be a lot less than the original heat sink.


It would be an odd construction - that had so much free real estate in
that particular direction, away from the heat source.

If you mean the computer case, it\'s not in one, the motherboard sits on
a bookshelf. It\'s a research machine sat in my garage made out of spare
parts, and no case was the right shape to fit a dual server board into.

It is antisocial to operate a fast PC outside an enclosure other than
for testing because it is a broadband emitter of RF interference to GHz.

I don\'t give a fuck. And that does explain why the monitor jumps a bit. There are 5 such open cased machines there. I wonder if that\'s why my neighbour has installed some kind of WiFi repeater in his garden :) Pissed him off without even trying!

You are starting to sound like a dick who used to post here under another name that I can\'t recall. What was it? You used to blow up stuff and get mad at the people who made it.

I set fire to a strimmer once. I haven\'t blown much up, unless you call smashing the spark plugs in a Renault engine \"blowing up\". All I did as overrev it, assuming that all modern cars had a rev limiter. but then the French are a bit lackadaisical.

Maybe you aren\'t guy I\'m thinking about. He would do goofy stuff and end up ruining computers and components.


You\'d get a better result with a bigger mounting interface to the heat
source,

Can\'t be done, the CPU is a specific size that cannot be changed.

You can get oversize heatsinks using heatpipes to shift more heat from
the CPU to the finned metal.

But the interface between the CPU and the block would be the same size - the area of the CPU.

Yes, you are very definitely not understanding what is going on. If the interface to the CPU was the limiting factor in heat conduction, then you would not get better performance by stacking your heat sinks either.

Bullshit. It\'s not as simple as traffic on a road, where one junction is the bottleneck and no changes to surrounding roads makes that junction any faster. If the interface to the CPU is limiting heat transfer, and say producing a temperature difference of 20C between the CPU and heatsink block, and then you make the heatsink colder by a bigger fan or a bigger heatsink, you could increase that 20C difference, causing more heat to flow through your so-called \"bottleneck\". Think of it like a garden hose, the width of the hose is limiting the water transfer. But if you increase the pressure, more gets through.

That\'s true, but you are the one talking about the limitation imposed by the area of contact to the CPU.


Larger fans are quieter too. If all else
fails water cool the thing which is what the serious overclockers do..

Expensive, hassle, leakages....

And serious overclockers use liquid nitrogen, or submerse the whole thing in oil!

So you just want to do something lame and pathetic?

I want to make it run cooler without expense or time.

How much expense? Everything has expense and time.


coupling the heatpipes to it in parallel, rather in series,
or just by pushing more air.

Heatpipes only work if the temperature of the source exceeds a certain
level.

The top of the current single one feels pretty hot, so the bottom of the
new one would also be.

The way to cool it is use a larger heatsink designed to match the CPU
surface and use the right compound to make the best thermal joint.

I just replaced the fan with a faster one. Lost 20C. I\'d forgotten how shit some fans are. 1100rpm to 4000rpm!

Yeah, it\'s not uncommon for people to rush to a solution before they have all the facts. Still wanting to stack heat sinks?

I\'ll correct that for you, \"it\'s common for people....\" You do like to do things the longwinded way don\'t you? Stacking the heatsink was the easiest way to fix the problem.

No need to correct anything, it was perfectly correct the first time and you now have altered the meaning. So what name did you used to post under? You didn\'t answer that.


Stacking heat sinks is not likely to \"fix\" anything. It may gain you some minimal reduction of temperature at the CPU but I expect \"minimal\" to be the important word there.

In the end you have found the real problem that needed to be \"fixed\", a defective fan. Since the original heat sink was not working correctly, stacking another heat sink very possibly would have improved the heat flow enough to be useful and you would have declared it \"fixed\" even though you had not found the real source of trouble.

It doesn\'t take a PhD to realize the stacking thing was a bad idea from the start.

--

Rick C.

+- Get 1,000 miles of free Supercharging
+- Tesla referral code - https://ts.la/richard11209
 
On Sunday, July 26, 2020 at 1:03:55 PM UTC-4, Commander Kinsey wrote:
On Sun, 26 Jul 2020 17:14:59 +0100, Ricketty C <gnuarm.deletethisbit@gmail.com> wrote:

On Sunday, July 26, 2020 at 5:43:51 AM UTC-4, Martin Brown wrote:
On 25/07/2020 22:39, Commander Kinsey wrote:
On Sat, 25 Jul 2020 21:09:52 +0100, legg <legg@nospam.magma.ca> wrote:


Stacking CPU coolers will have a huge impedance mismatch on the second
one - essentially wasting most of its capability.

A highly faulty analysis.

People often think the best match for power is equal impedance, but that is not the case when the impedance of the load is fixed.

It is in stereos.

That shows you didn\'t understand anything I wrote.


In that case the lowest possible impedance in the supply provides for the optimum power transfer. That\'s why power supplies are designed with very low output impedances. Same thing here, only the guy is trying to optimize his costs, rather than ultimate effectiveness of the cooling.

I have no idea what his heat sinks look like or how he plans to attach them, but adding a second heat sink will most likely improve his cooling. The only question is by how much.

Ah so now you admit my idea was sensible.

No, again, you don\'t understand what I wrote. I can make a car go faster from a start by dumping the clutch. Doesn\'t mean it\'s a good idea or \"sensible\". Read what I wrote... carefully.


That can\'t be answered without more information. He talks about \"a\" heat pipe being near the top of the heat sink,

There\'s 4 running from the block through the fins to the top.

but any one heat pipe has limited heat capacity, so still insufficient info.

The top is almost as hot as the bottom, the pipes are not a limiting factor.

Not in your case where the fan was not working correctly.

--

Rick C.

++ Get 1,000 miles of free Supercharging
++ Tesla referral code - https://ts.la/richard11209
 
On Sat, 25 Jul 2020 22:39:38 +0100, \"Commander Kinsey\"
<CFKinsey@military.org.jp> wrote:

On Sat, 25 Jul 2020 21:09:52 +0100, legg <legg@nospam.magma.ca> wrote:

On Sat, 25 Jul 2020 20:06:20 +0100, \"Commander Kinsey\"
CFKinsey@military.org.jp> wrote:

On Sat, 25 Jul 2020 19:21:25 +0100, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2020-07-25 14:01, Commander Kinsey wrote:
Has anybody ever stacked two CPU coolers? First one fitted normally,
then the second welded on top of it. Theoretically, you have twice the
cooling, if it conducts through the first fast enough. I\'m referring to
the type with the fan on the side.

Stacked TECs are an old technology. They work at some level if you\'re
careful, but the inefficiency of the earlier stages produces a huge heat
load on the later ones, so the available delta-T is generally disappointing.

I wasn\'t considering peltier. Just a finned lump of metal with a fan on the side. Like this:
http://www.shoppingexpress.com.au/assets/full/CL-P039-AL12BL-A.jpg
Now consider another of those clamped to the top of that one. If enough heat is transferred to the top of the first one, and the one I have is hot to touch on the top, then that heat could be conducted away by the second one.

It would be an odd construction - that had so much free real estate in
that particular direction, away from the heat source.

If you mean the computer case, it\'s not in one, the motherboard sits on a bookshelf. It\'s a research machine sat in my garage made out of spare parts, and no case was the right shape to fit a dual server board into.

You\'d get a better result with a bigger mounting interface to the heat
source,

Can\'t be done, the CPU is a specific size that cannot be changed.

Use a heat spreader on the chip.

RL
 
On Sun, 26 Jul 2020 18:33:23 +0100, Ricketty C <gnuarm.deletethisbit@gmail.com> wrote:

On Sunday, July 26, 2020 at 1:01:31 PM UTC-4, Commander Kinsey wrote:
On Sun, 26 Jul 2020 17:25:16 +0100, Ricketty C <gnuarm.deletethisbit@gmail.com> wrote:

On Sunday, July 26, 2020 at 10:42:49 AM UTC-4, Commander Kinsey wrote:
On Sun, 26 Jul 2020 10:43:46 +0100, Martin Brown <\'\'\'newspam\'\'\'@nezumi.demon.co.uk> wrote:

On 25/07/2020 22:39, Commander Kinsey wrote:
On Sat, 25 Jul 2020 21:09:52 +0100, legg <legg@nospam.magma.ca> wrote:

Stacking CPU coolers will have a huge impedance mismatch on the second
one - essentially wasting most of its capability.

Since the heatpipes of each would be very close, the length of normal steel would be minimal.

WTF are you talking about \"normal steel\"???

I mean metal that isn\'t a heatpipe.

Each heat pipe can only carry a small amount of heat, that\'s why they use many. Otherwise they would just use one pipe snaked along the fins.

I assumed snaking would be harder to make. Anyway since the original heatpipes are still almost as hot at the top as the bottom, I\'m sure they could carry more if the top of them was cooled by another heatsink.

Did you measure? I\'m sure stacking heat sinks will improve the heat flow. The issue is how much. I expect it will be a lot less than the original heat sink.

I did measure, with the very accurate sensor built into my fingertip. How long can you keep your finger on the surface before saying ouch, is pretty accurate to compare one thing to another. Plumbers actually use it to make sure a central heating system is heating the radiators to a sensible temperature.

It would be an odd construction - that had so much free real estate in
that particular direction, away from the heat source.

If you mean the computer case, it\'s not in one, the motherboard sits on
a bookshelf. It\'s a research machine sat in my garage made out of spare
parts, and no case was the right shape to fit a dual server board into.

It is antisocial to operate a fast PC outside an enclosure other than
for testing because it is a broadband emitter of RF interference to GHz.

I don\'t give a fuck. And that does explain why the monitor jumps a bit. There are 5 such open cased machines there. I wonder if that\'s why my neighbour has installed some kind of WiFi repeater in his garden :) Pissed him off without even trying!

You are starting to sound like a dick who used to post here under another name that I can\'t recall. What was it? You used to blow up stuff and get mad at the people who made it.

I set fire to a strimmer once. I haven\'t blown much up, unless you call smashing the spark plugs in a Renault engine \"blowing up\". All I did as overrev it, assuming that all modern cars had a rev limiter. but then the French are a bit lackadaisical.

Maybe you aren\'t guy I\'m thinking about. He would do goofy stuff and end up ruining computers and components.

I am goofy, but not with computers. I usually break cars. Ever seen a tractor with the front half on the other side of the road, and the back half tipped over with the driver yelling abuse?

You\'d get a better result with a bigger mounting interface to the heat
source,

Can\'t be done, the CPU is a specific size that cannot be changed.

You can get oversize heatsinks using heatpipes to shift more heat from
the CPU to the finned metal.

But the interface between the CPU and the block would be the same size - the area of the CPU.

Yes, you are very definitely not understanding what is going on. If the interface to the CPU was the limiting factor in heat conduction, then you would not get better performance by stacking your heat sinks either.

Bullshit. It\'s not as simple as traffic on a road, where one junction is the bottleneck and no changes to surrounding roads makes that junction any faster. If the interface to the CPU is limiting heat transfer, and say producing a temperature difference of 20C between the CPU and heatsink block, and then you make the heatsink colder by a bigger fan or a bigger heatsink, you could increase that 20C difference, causing more heat to flow through your so-called \"bottleneck\". Think of it like a garden hose, the width of the hose is limiting the water transfer. But if you increase the pressure, more gets through.

That\'s true, but you are the one talking about the limitation imposed by the area of contact to the CPU.

The \"limitation\" I mentioned was the size of the CPU area. So you cannot increase that without changing the CPU.

Larger fans are quieter too. If all else
fails water cool the thing which is what the serious overclockers do.

Expensive, hassle, leakages....

And serious overclockers use liquid nitrogen, or submerse the whole thing in oil!

So you just want to do something lame and pathetic?

I want to make it run cooler without expense or time.

How much expense? Everything has expense and time.

It\'s a £7 CPU. A £50 cooler is absurd.

coupling the heatpipes to it in parallel, rather in series,
or just by pushing more air.

Heatpipes only work if the temperature of the source exceeds a certain
level.

The top of the current single one feels pretty hot, so the bottom of the
new one would also be.

The way to cool it is use a larger heatsink designed to match the CPU
surface and use the right compound to make the best thermal joint.

I just replaced the fan with a faster one. Lost 20C. I\'d forgotten how shit some fans are. 1100rpm to 4000rpm!

Yeah, it\'s not uncommon for people to rush to a solution before they have all the facts. Still wanting to stack heat sinks?

I\'ll correct that for you, \"it\'s common for people....\" You do like to do things the longwinded way don\'t you? Stacking the heatsink was the easiest way to fix the problem.

No need to correct anything, it was perfectly correct the first time and you now have altered the meaning.

No. It meant precisely what you did. I removed two negatives. As any mathematician will tell you, two negatives make a positive. Eg., \"I don\'t doubt it\" means \"I think so\".

> So what name did you used to post under? You didn\'t answer that.

Several. Offhand I can think of Lieutenant Scott and Uncle Peter.

Stacking heat sinks is not likely to \"fix\" anything. It may gain you some minimal reduction of temperature at the CPU but I expect \"minimal\" to be the important word there.

In the end you have found the real problem that needed to be \"fixed\", a defective fan.

Not defective per se, just shit. Strangely the same model of fan and heatsink cools the other three CPUs ok. Either one CPU runs hotter as it\'s buggered, or the motherboard voltage regulation for it is off, or that area has warmer air in it.

Since the original heat sink was not working correctly, stacking another heat sink very possibly would have improved the heat flow enough to be useful and you would have declared it \"fixed\" even though you had not found the real source of trouble.

It doesn\'t take a PhD to realize the stacking thing was a bad idea from the start.

No, since the fan was insufficient, stacking two together would have worked well, doubling the number of fans (therefore the airflow), and doubling the surface area of fins to transfer heat to the air.
 
On Sun, 26 Jul 2020 18:37:23 +0100, Ricketty C <gnuarm.deletethisbit@gmail.com> wrote:

On Sunday, July 26, 2020 at 1:03:55 PM UTC-4, Commander Kinsey wrote:
On Sun, 26 Jul 2020 17:14:59 +0100, Ricketty C <gnuarm.deletethisbit@gmail.com> wrote:

On Sunday, July 26, 2020 at 5:43:51 AM UTC-4, Martin Brown wrote:
On 25/07/2020 22:39, Commander Kinsey wrote:
On Sat, 25 Jul 2020 21:09:52 +0100, legg <legg@nospam.magma.ca> wrote:


Stacking CPU coolers will have a huge impedance mismatch on the second
one - essentially wasting most of its capability.

A highly faulty analysis.

People often think the best match for power is equal impedance, but that is not the case when the impedance of the load is fixed.

It is in stereos.

That shows you didn\'t understand anything I wrote.

I understood it perfectly. I was pointing out that you were not correct in all cases. In a stereo the impedance of the load is fixed, the speaker doesn\'t change.

In that case the lowest possible impedance in the supply provides for the optimum power transfer. That\'s why power supplies are designed with very low output impedances. Same thing here, only the guy is trying to optimize his costs, rather than ultimate effectiveness of the cooling.

I have no idea what his heat sinks look like or how he plans to attach them, but adding a second heat sink will most likely improve his cooling. The only question is by how much.

Ah so now you admit my idea was sensible.

No, again, you don\'t understand what I wrote. I can make a car go faster from a start by dumping the clutch. Doesn\'t mean it\'s a good idea or \"sensible\". Read what I wrote... carefully.

Dumping the clutch causes damage, my idea would not.
 
On Sunday, July 26, 2020 at 2:52:16 PM UTC-4, Commander Kinsey wrote:
On Sun, 26 Jul 2020 18:33:23 +0100, Ricketty C <gnuarm.deletethisbit@gmail.com> wrote:

On Sunday, July 26, 2020 at 1:01:31 PM UTC-4, Commander Kinsey wrote:
On Sun, 26 Jul 2020 17:25:16 +0100, Ricketty C <gnuarm.deletethisbit@gmail.com> wrote:

On Sunday, July 26, 2020 at 10:42:49 AM UTC-4, Commander Kinsey wrote:
On Sun, 26 Jul 2020 10:43:46 +0100, Martin Brown <\'\'\'newspam\'\'\'@nezumi.demon.co.uk> wrote:

On 25/07/2020 22:39, Commander Kinsey wrote:
On Sat, 25 Jul 2020 21:09:52 +0100, legg <legg@nospam.magma.ca> wrote:

Stacking CPU coolers will have a huge impedance mismatch on the second
one - essentially wasting most of its capability.

Since the heatpipes of each would be very close, the length of normal steel would be minimal.

WTF are you talking about \"normal steel\"???

I mean metal that isn\'t a heatpipe.

Each heat pipe can only carry a small amount of heat, that\'s why they use many. Otherwise they would just use one pipe snaked along the fins.

I assumed snaking would be harder to make. Anyway since the original heatpipes are still almost as hot at the top as the bottom, I\'m sure they could carry more if the top of them was cooled by another heatsink.

Did you measure? I\'m sure stacking heat sinks will improve the heat flow. The issue is how much. I expect it will be a lot less than the original heat sink.

I did measure, with the very accurate sensor built into my fingertip. How long can you keep your finger on the surface before saying ouch, is pretty accurate to compare one thing to another. Plumbers actually use it to make sure a central heating system is heating the radiators to a sensible temperature.

And yet you failed to recognize the lack of heat flow because of the bad fan.


It would be an odd construction - that had so much free real estate in
that particular direction, away from the heat source.

If you mean the computer case, it\'s not in one, the motherboard sits on
a bookshelf. It\'s a research machine sat in my garage made out of spare
parts, and no case was the right shape to fit a dual server board into.

It is antisocial to operate a fast PC outside an enclosure other than
for testing because it is a broadband emitter of RF interference to GHz.

I don\'t give a fuck. And that does explain why the monitor jumps a bit. There are 5 such open cased machines there. I wonder if that\'s why my neighbour has installed some kind of WiFi repeater in his garden :) Pissed him off without even trying!

You are starting to sound like a dick who used to post here under another name that I can\'t recall. What was it? You used to blow up stuff and get mad at the people who made it.

I set fire to a strimmer once. I haven\'t blown much up, unless you call smashing the spark plugs in a Renault engine \"blowing up\". All I did as overrev it, assuming that all modern cars had a rev limiter. but then the French are a bit lackadaisical.

Maybe you aren\'t guy I\'m thinking about. He would do goofy stuff and end up ruining computers and components.

I am goofy, but not with computers. I usually break cars. Ever seen a tractor with the front half on the other side of the road, and the back half tipped over with the driver yelling abuse?

You\'d get a better result with a bigger mounting interface to the heat
source,

Can\'t be done, the CPU is a specific size that cannot be changed..

You can get oversize heatsinks using heatpipes to shift more heat from
the CPU to the finned metal.

But the interface between the CPU and the block would be the same size - the area of the CPU.

Yes, you are very definitely not understanding what is going on. If the interface to the CPU was the limiting factor in heat conduction, then you would not get better performance by stacking your heat sinks either.

Bullshit. It\'s not as simple as traffic on a road, where one junction is the bottleneck and no changes to surrounding roads makes that junction any faster. If the interface to the CPU is limiting heat transfer, and say producing a temperature difference of 20C between the CPU and heatsink block, and then you make the heatsink colder by a bigger fan or a bigger heatsink, you could increase that 20C difference, causing more heat to flow through your so-called \"bottleneck\". Think of it like a garden hose, the width of the hose is limiting the water transfer. But if you increase the pressure, more gets through.

That\'s true, but you are the one talking about the limitation imposed by the area of contact to the CPU.

The \"limitation\" I mentioned was the size of the CPU area. So you cannot increase that without changing the CPU.

Which is nothing anyone was talking about other than you. Like most rational people it was pointed out that the obvious solution was to use a better heat sink rather than trying to jury rig something. You failed to mention your financial constraints initially.


Larger fans are quieter too. If all else
fails water cool the thing which is what the serious overclockers do.

Expensive, hassle, leakages....

And serious overclockers use liquid nitrogen, or submerse the whole thing in oil!

So you just want to do something lame and pathetic?

I want to make it run cooler without expense or time.

How much expense? Everything has expense and time.

It\'s a £7 CPU. A £50 cooler is absurd.

Actually it\'s not. If that is the best way to repair something, then the comparison is the value of the repaired item vs. the value of the broken item. You didn\'t discuss any of this initially.


coupling the heatpipes to it in parallel, rather in series,
or just by pushing more air.

Heatpipes only work if the temperature of the source exceeds a certain
level.

The top of the current single one feels pretty hot, so the bottom of the
new one would also be.

The way to cool it is use a larger heatsink designed to match the CPU
surface and use the right compound to make the best thermal joint..

I just replaced the fan with a faster one. Lost 20C. I\'d forgotten how shit some fans are. 1100rpm to 4000rpm!

Yeah, it\'s not uncommon for people to rush to a solution before they have all the facts. Still wanting to stack heat sinks?

I\'ll correct that for you, \"it\'s common for people....\" You do like to do things the longwinded way don\'t you? Stacking the heatsink was the easiest way to fix the problem.

No need to correct anything, it was perfectly correct the first time and you now have altered the meaning.

No. It meant precisely what you did. I removed two negatives. As any mathematician will tell you, two negatives make a positive. Eg., \"I don\'t doubt it\" means \"I think so\".

Not really. You altered the meaning because you are limiting your thinking to a binary choice. It\'s not binary.


So what name did you used to post under? You didn\'t answer that.

Several. Offhand I can think of Lieutenant Scott and Uncle Peter.

Ok, then you aren\'t the guy I was thinking of.


Stacking heat sinks is not likely to \"fix\" anything. It may gain you some minimal reduction of temperature at the CPU but I expect \"minimal\" to be the important word there.

In the end you have found the real problem that needed to be \"fixed\", a defective fan.

Not defective per se, just shit. Strangely the same model of fan and heatsink cools the other three CPUs ok. Either one CPU runs hotter as it\'s buggered, or the motherboard voltage regulation for it is off, or that area has warmer air in it.

Yes, defective. You said it ran slower than the others, so not working correctly. A fan is a very simple device. Hard to say it\'s not working right without being \"defective\".


Since the original heat sink was not working correctly, stacking another heat sink very possibly would have improved the heat flow enough to be useful and you would have declared it \"fixed\" even though you had not found the real source of trouble.

It doesn\'t take a PhD to realize the stacking thing was a bad idea from the start.

No, since the fan was insufficient, stacking two together would have worked well, doubling the number of fans (therefore the airflow), and doubling the surface area of fins to transfer heat to the air.

Your jury rig would have partially compensated for the broken fan, but the fact remains that you did not pay attention to what was going on and diagnose the failed fan. So the stacked heat sink would have been doubly bad, still not working like it should and covering up the actual failure.

--

Rick C.

--- Get 1,000 miles of free Supercharging
--- Tesla referral code - https://ts.la/richard11209
 
On Sunday, July 26, 2020 at 2:54:10 PM UTC-4, Commander Kinsey wrote:
On Sun, 26 Jul 2020 18:37:23 +0100, Ricketty C <gnuarm.deletethisbit@gmail.com> wrote:

On Sunday, July 26, 2020 at 1:03:55 PM UTC-4, Commander Kinsey wrote:
On Sun, 26 Jul 2020 17:14:59 +0100, Ricketty C <gnuarm.deletethisbit@gmail.com> wrote:

On Sunday, July 26, 2020 at 5:43:51 AM UTC-4, Martin Brown wrote:
On 25/07/2020 22:39, Commander Kinsey wrote:
On Sat, 25 Jul 2020 21:09:52 +0100, legg <legg@nospam.magma.ca> wrote:


Stacking CPU coolers will have a huge impedance mismatch on the second
one - essentially wasting most of its capability.

A highly faulty analysis.

People often think the best match for power is equal impedance, but that is not the case when the impedance of the load is fixed.

It is in stereos.

That shows you didn\'t understand anything I wrote.

I understood it perfectly. I was pointing out that you were not correct in all cases. In a stereo the impedance of the load is fixed, the speaker doesn\'t change.

If you fix the load impedance, what do you change? If you can\'t change anything there is nothing to compare. So again, you fail to understand what I wrote.


In that case the lowest possible impedance in the supply provides for the optimum power transfer. That\'s why power supplies are designed with very low output impedances. Same thing here, only the guy is trying to optimize his costs, rather than ultimate effectiveness of the cooling.

I have no idea what his heat sinks look like or how he plans to attach them, but adding a second heat sink will most likely improve his cooling.. The only question is by how much.

Ah so now you admit my idea was sensible.

No, again, you don\'t understand what I wrote. I can make a car go faster from a start by dumping the clutch. Doesn\'t mean it\'s a good idea or \"sensible\". Read what I wrote... carefully.

Dumping the clutch causes damage, my idea would not.

That doesn\'t equate to sensible. It was a lame idea that you came up with because of a failure to diagnose the real problem, lack of air movement. Clearly the idea of fixing a lame fan by adding another heat sink is a lame idea.

--

Rick C.

--+ Get 1,000 miles of free Supercharging
--+ Tesla referral code - https://ts.la/richard11209
 
On Sun, 26 Jul 2020 20:18:46 +0100, Ricketty C <gnuarm.deletethisbit@gmail.com> wrote:

On Sunday, July 26, 2020 at 2:54:10 PM UTC-4, Commander Kinsey wrote:
On Sun, 26 Jul 2020 18:37:23 +0100, Ricketty C <gnuarm.deletethisbit@gmail.com> wrote:

On Sunday, July 26, 2020 at 1:03:55 PM UTC-4, Commander Kinsey wrote:
On Sun, 26 Jul 2020 17:14:59 +0100, Ricketty C <gnuarm.deletethisbit@gmail.com> wrote:

On Sunday, July 26, 2020 at 5:43:51 AM UTC-4, Martin Brown wrote:
On 25/07/2020 22:39, Commander Kinsey wrote:
On Sat, 25 Jul 2020 21:09:52 +0100, legg <legg@nospam.magma.ca> wrote:


Stacking CPU coolers will have a huge impedance mismatch on the second
one - essentially wasting most of its capability.

A highly faulty analysis.

People often think the best match for power is equal impedance, but that is not the case when the impedance of the load is fixed.

It is in stereos.

That shows you didn\'t understand anything I wrote.

I understood it perfectly. I was pointing out that you were not correct in all cases. In a stereo the impedance of the load is fixed, the speaker doesn\'t change.

If you fix the load impedance, what do you change? If you can\'t change anything there is nothing to compare. So again, you fail to understand what I wrote.

You compare different source impedances duh. That\'s the only variable left.

In that case the lowest possible impedance in the supply provides for the optimum power transfer. That\'s why power supplies are designed with very low output impedances. Same thing here, only the guy is trying to optimize his costs, rather than ultimate effectiveness of the cooling.

I have no idea what his heat sinks look like or how he plans to attach them, but adding a second heat sink will most likely improve his cooling. The only question is by how much.

Ah so now you admit my idea was sensible.

No, again, you don\'t understand what I wrote. I can make a car go faster from a start by dumping the clutch. Doesn\'t mean it\'s a good idea or \"sensible\". Read what I wrote... carefully.

Dumping the clutch causes damage, my idea would not.

That doesn\'t equate to sensible. It was a lame idea that you came up with because of a failure to diagnose the real problem, lack of air movement. Clearly the idea of fixing a lame fan by adding another heat sink is a lame idea.

No, because it would have worked, and would have been quieter than a powerful fan.
 
Silly troll...

--
\"Commander Kinsey\" <CFKinsey@military.org.jp> wrote:

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From: \"Commander Kinsey\" <CFKinsey@military.org.jp
Newsgroups: sci.electronics.design
Subject: Has anybody ever stacked two CPU coolers?
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Has anybody ever stacked two CPU coolers? First one fitted normally, then the second welded on top of it. Theoretically, you have twice the cooling, if it conducts through the first fast enough. I\'m referring to the type with the fan on the side.
 
The obvious answer is...

Since the foundation of a heatsink is designed to suck the same amount
of heat the heatsink can dissipate, the foundation will be a bottleneck.

Get a good CPU cooler, instead.
 
On Sunday, July 26, 2020 at 5:19:03 PM UTC-4, Commander Kinsey wrote:
On Sun, 26 Jul 2020 20:18:46 +0100, Ricketty C <gnuarm.deletethisbit@gmail.com> wrote:

On Sunday, July 26, 2020 at 2:54:10 PM UTC-4, Commander Kinsey wrote:
On Sun, 26 Jul 2020 18:37:23 +0100, Ricketty C <gnuarm.deletethisbit@gmail.com> wrote:

On Sunday, July 26, 2020 at 1:03:55 PM UTC-4, Commander Kinsey wrote:
On Sun, 26 Jul 2020 17:14:59 +0100, Ricketty C <gnuarm.deletethisbit@gmail.com> wrote:

On Sunday, July 26, 2020 at 5:43:51 AM UTC-4, Martin Brown wrote:
On 25/07/2020 22:39, Commander Kinsey wrote:
On Sat, 25 Jul 2020 21:09:52 +0100, legg <legg@nospam.magma.ca> wrote:


Stacking CPU coolers will have a huge impedance mismatch on the second
one - essentially wasting most of its capability.

A highly faulty analysis.

People often think the best match for power is equal impedance, but that is not the case when the impedance of the load is fixed.

It is in stereos.

That shows you didn\'t understand anything I wrote.

I understood it perfectly. I was pointing out that you were not correct in all cases. In a stereo the impedance of the load is fixed, the speaker doesn\'t change.

If you fix the load impedance, what do you change? If you can\'t change anything there is nothing to compare. So again, you fail to understand what I wrote.

You compare different source impedances duh. That\'s the only variable left.

So what happens as you lower the source impedance? At what point do you get the most power into the load?


In that case the lowest possible impedance in the supply provides for the optimum power transfer. That\'s why power supplies are designed with very low output impedances. Same thing here, only the guy is trying to optimize his costs, rather than ultimate effectiveness of the cooling.

I have no idea what his heat sinks look like or how he plans to attach them, but adding a second heat sink will most likely improve his cooling. The only question is by how much.

Ah so now you admit my idea was sensible.

No, again, you don\'t understand what I wrote. I can make a car go faster from a start by dumping the clutch. Doesn\'t mean it\'s a good idea or \"sensible\". Read what I wrote... carefully.

Dumping the clutch causes damage, my idea would not.

That doesn\'t equate to sensible. It was a lame idea that you came up with because of a failure to diagnose the real problem, lack of air movement.. Clearly the idea of fixing a lame fan by adding another heat sink is a lame idea.

No, because it would have worked, and would have been quieter than a powerful fan.

1) You don\'t know if it would have worked because you have no idea how much heat would have found it\'s way into the second heat sink.

2) You said \"quiet\" didn\'t matter because the rig is in the garage.

I don\'t know why you keep going on about this. You eventually diagnosed the real problem and got a fix. The idea of stacking heat sinks is not very practical and may or may not have \"worked\" since there is no clear definition of \"worked\".

--

Rick C.

-+- Get 1,000 miles of free Supercharging
-+- Tesla referral code - https://ts.la/richard11209
 
On Sunday, July 26, 2020 at 7:11:28 PM UTC-4, John Doe wrote:
The obvious answer is...

Since the foundation of a heatsink is designed to suck the same amount
of heat the heatsink can dissipate, the foundation will be a bottleneck.

That is not at all evident. The junction to the CPU is an added resistance to heat flow. It is what it is. It is not likely to be much of a factor in the overall cooling even if you draw more power. Keep in mind he was seeing many degrees of temperature rise above ambient. Virtually anything would have improved his heat flow.

--

Rick C.

-++ Get 1,000 miles of free Supercharging
-++ Tesla referral code - https://ts.la/richard11209
 
On 2020-07-26, Ricketty C <gnuarm.deletethisbit@gmail.com> wrote:

You are starting to sound like a dick who used to post here under another name that I can\'t recall. What was it? You used to blow up stuff and get mad at the people who made it.

I set fire to a strimmer once. I haven\'t blown much up, unless you call smashing the spark plugs in a Renault engine \"blowing up\". All I did as overrev it, assuming that all modern cars had a rev limiter. but then the French are a bit lackadaisical.

Maybe you aren\'t guy I\'m thinking about. He would do goofy stuff and end up ruining computers and components.

That would be \"Skybuck flying High\"

--
Jasen.
 
On Sat, 25 Jul 2020 19:58:50 -0700 (PDT), Bill Sloman
<bill.sloman@ieee.org> wrote:

On Sunday, July 26, 2020 at 6:04:10 AM UTC+10, legg wrote:
On Sat, 25 Jul 2020 20:06:20 +0100, \"Commander Kinsey\"
CFKinsey@military.org.jp> wrote:

On Sat, 25 Jul 2020 19:21:25 +0100, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2020-07-25 14:01, Commander Kinsey wrote:
Has anybody ever stacked two CPU coolers? First one fitted normally,
then the second welded on top of it. Theoretically, you have twice the
cooling, if it conducts through the first fast enough. I\'m referring to
the type with the fan on the side.

Stacked TECs are an old technology. They work at some level if you\'re
careful, but the inefficiency of the earlier stages produces a huge heat
load on the later ones, so the available delta-T is generally disappointing.

I wasn\'t considering peltier. Just a finned lump of metal with a fan on the side. Like this:
http://www.shoppingexpress.com.au/assets/full/CL-P039-AL12BL-A.jpg
Now consider another of those clamped to the top of that one. If enough heat is transferred to the top of the first one, and the one I have is hot to touch on the top, then that heat could be conducted away by the second one.

It would be an odd construction - that had so much free real estate in
that particular direction, away from the heat source.

You\'d get a better result with a bigger mounting interface to the heat
source, coupling the heatpipes to it in parallel, rather in series,
or just by pushing more air.

Heatpipes only work if the temperature of the source exceeds a certain
level.

Wrong, if the heat-pipe has been properly evacuated before it was sealed off.

We ran into this, and had to set up a test rig to make sure that the heat pipes we had got had been properly evacuated. We only had to send back a few before we stopped get parts that failed the test.

Sloman A.W., Buggs P., Molloy J., and Stewart D. “A microcontroller-based driver to stabilise the temperature of an optical stage to 1mK in the range 4C to 38C, using a Peltier heat pump and a thermistor sensor” Measurement Science and Technology, 7 1653-64 (1996)

The problem comes if there\'s enough pressure of non-condensible gas in the heatpipe to slow the evaporation at hot end, and - more important - to slow down the evaporating vapour on its way to heat-dissipating end.

If there\'s no non-condensible gas to get in the way, the vapour can flow very fast.

You\'re right, but for copper/water pipes, not much is going to happen
below ambient +5C. You need a deltaT to get things moving.

RL
 
On Monday, July 27, 2020 at 1:32:42 AM UTC-4, Jasen Betts wrote:
On 2020-07-26, Ricketty C <gnuarm.deletethisbit@gmail.com> wrote:

You are starting to sound like a dick who used to post here under another name that I can\'t recall. What was it? You used to blow up stuff and get mad at the people who made it.

I set fire to a strimmer once. I haven\'t blown much up, unless you call smashing the spark plugs in a Renault engine \"blowing up\". All I did as overrev it, assuming that all modern cars had a rev limiter. but then the French are a bit lackadaisical.

Maybe you aren\'t guy I\'m thinking about. He would do goofy stuff and end up ruining computers and components.

That would be \"Skybuck flying High\"

Maybe I\'m thinking of Skybuck, but he was always very recognizable because of the spaces between Skybuck and whatever he said.

--

Rick C.

+-- Get 1,000 miles of free Supercharging
+-- Tesla referral code - https://ts.la/richard11209
 
On Sun, 26 Jul 2020 19:20:56 +0100, legg <legg@nospam.magma.ca> wrote:

On Sat, 25 Jul 2020 22:39:38 +0100, \"Commander Kinsey\"
CFKinsey@military.org.jp> wrote:

On Sat, 25 Jul 2020 21:09:52 +0100, legg <legg@nospam.magma.ca> wrote:

On Sat, 25 Jul 2020 20:06:20 +0100, \"Commander Kinsey\"
CFKinsey@military.org.jp> wrote:

On Sat, 25 Jul 2020 19:21:25 +0100, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

On 2020-07-25 14:01, Commander Kinsey wrote:
Has anybody ever stacked two CPU coolers? First one fitted normally,
then the second welded on top of it. Theoretically, you have twice the
cooling, if it conducts through the first fast enough. I\'m referring to
the type with the fan on the side.

Stacked TECs are an old technology. They work at some level if you\'re
careful, but the inefficiency of the earlier stages produces a huge heat
load on the later ones, so the available delta-T is generally disappointing.

I wasn\'t considering peltier. Just a finned lump of metal with a fan on the side. Like this:
http://www.shoppingexpress.com.au/assets/full/CL-P039-AL12BL-A.jpg
Now consider another of those clamped to the top of that one. If enough heat is transferred to the top of the first one, and the one I have is hot to touch on the top, then that heat could be conducted away by the second one.

It would be an odd construction - that had so much free real estate in
that particular direction, away from the heat source.

If you mean the computer case, it\'s not in one, the motherboard sits on a bookshelf. It\'s a research machine sat in my garage made out of spare parts, and no case was the right shape to fit a dual server board into.

You\'d get a better result with a bigger mounting interface to the heat
source,

Can\'t be done, the CPU is a specific size that cannot be changed.

Use a heat spreader on the chip.

You\'re still limited by the contact area of the chip touching the same area of heat spreader.
 
On Sun, 26 Jul 2020 20:14:11 +0100, Ricketty C <gnuarm.deletethisbit@gmail.com> wrote:

On Sunday, July 26, 2020 at 2:52:16 PM UTC-4, Commander Kinsey wrote:
On Sun, 26 Jul 2020 18:33:23 +0100, Ricketty C <gnuarm.deletethisbit@gmail.com> wrote:

On Sunday, July 26, 2020 at 1:01:31 PM UTC-4, Commander Kinsey wrote:
On Sun, 26 Jul 2020 17:25:16 +0100, Ricketty C <gnuarm.deletethisbit@gmail.com> wrote:

On Sunday, July 26, 2020 at 10:42:49 AM UTC-4, Commander Kinsey wrote:
On Sun, 26 Jul 2020 10:43:46 +0100, Martin Brown <\'\'\'newspam\'\'\'@nezumi.demon.co.uk> wrote:

On 25/07/2020 22:39, Commander Kinsey wrote:
On Sat, 25 Jul 2020 21:09:52 +0100, legg <legg@nospam.magma.ca> wrote:

Stacking CPU coolers will have a huge impedance mismatch on the second
one - essentially wasting most of its capability.

Since the heatpipes of each would be very close, the length of normal steel would be minimal.

WTF are you talking about \"normal steel\"???

I mean metal that isn\'t a heatpipe.

Each heat pipe can only carry a small amount of heat, that\'s why they use many. Otherwise they would just use one pipe snaked along the fins.

I assumed snaking would be harder to make. Anyway since the original heatpipes are still almost as hot at the top as the bottom, I\'m sure they could carry more if the top of them was cooled by another heatsink..

Did you measure? I\'m sure stacking heat sinks will improve the heat flow. The issue is how much. I expect it will be a lot less than the original heat sink.

I did measure, with the very accurate sensor built into my fingertip. How long can you keep your finger on the surface before saying ouch, is pretty accurate to compare one thing to another. Plumbers actually use it to make sure a central heating system is heating the radiators to a sensible temperature.

And yet you failed to recognize the lack of heat flow because of the bad fan.

The fan wasn\'t bad, it just wasn\'t a turbo super fast one.

And since the whole heatsink was hot, taking that heat away to another one would have helped.

It would be an odd construction - that had so much free real estate in
that particular direction, away from the heat source.

If you mean the computer case, it\'s not in one, the motherboard sits on
a bookshelf. It\'s a research machine sat in my garage made out of spare
parts, and no case was the right shape to fit a dual server board into.

It is antisocial to operate a fast PC outside an enclosure other than
for testing because it is a broadband emitter of RF interference to GHz.

I don\'t give a fuck. And that does explain why the monitor jumps a bit. There are 5 such open cased machines there. I wonder if that\'s why my neighbour has installed some kind of WiFi repeater in his garden :) Pissed him off without even trying!

You are starting to sound like a dick who used to post here under another name that I can\'t recall. What was it? You used to blow up stuff and get mad at the people who made it.

I set fire to a strimmer once. I haven\'t blown much up, unless you call smashing the spark plugs in a Renault engine \"blowing up\". All I did as overrev it, assuming that all modern cars had a rev limiter. but then the French are a bit lackadaisical.

Maybe you aren\'t guy I\'m thinking about. He would do goofy stuff and end up ruining computers and components.

I am goofy, but not with computers. I usually break cars. Ever seen a tractor with the front half on the other side of the road, and the back half tipped over with the driver yelling abuse?

You\'d get a better result with a bigger mounting interface to the heat
source,

Can\'t be done, the CPU is a specific size that cannot be changed.

You can get oversize heatsinks using heatpipes to shift more heat from
the CPU to the finned metal.

But the interface between the CPU and the block would be the same size - the area of the CPU.

Yes, you are very definitely not understanding what is going on. If the interface to the CPU was the limiting factor in heat conduction, then you would not get better performance by stacking your heat sinks either.

Bullshit. It\'s not as simple as traffic on a road, where one junction is the bottleneck and no changes to surrounding roads makes that junction any faster. If the interface to the CPU is limiting heat transfer, and say producing a temperature difference of 20C between the CPU and heatsink block, and then you make the heatsink colder by a bigger fan or a bigger heatsink, you could increase that 20C difference, causing more heat to flow through your so-called \"bottleneck\". Think of it like a garden hose, the width of the hose is limiting the water transfer. But if you increase the pressure, more gets through.

That\'s true, but you are the one talking about the limitation imposed by the area of contact to the CPU.

The \"limitation\" I mentioned was the size of the CPU area. So you cannot increase that without changing the CPU.

Which is nothing anyone was talking about other than you.

No, people were saying to increase the contact area with the heat source.. Not possible. The heat source is the CPU and is a fixed size.

> Like most rational people it was pointed out that the obvious solution was to use a better heat sink rather than trying to jury rig

Jerry rig.

> something. You failed to mention your financial constraints initially..

I see no point in buying something when you own something already that will serve the purpose.

Larger fans are quieter too. If all else
fails water cool the thing which is what the serious overclockers do.

Expensive, hassle, leakages....

And serious overclockers use liquid nitrogen, or submerse the whole thing in oil!

So you just want to do something lame and pathetic?

I want to make it run cooler without expense or time.

How much expense? Everything has expense and time.

It\'s a £7 CPU. A £50 cooler is absurd.

Actually it\'s not. If that is the best way to repair something, then the comparison is the value of the repaired item vs. the value of the broken item.

I guess you\'d buy a £500 car and spend three grand doing it up. Oh dear.

> You didn\'t discuss any of this initially.

Didn\'t discuss what?

coupling the heatpipes to it in parallel, rather in series,
or just by pushing more air.

Heatpipes only work if the temperature of the source exceeds a certain
level.

The top of the current single one feels pretty hot, so the bottom of the
new one would also be.

The way to cool it is use a larger heatsink designed to match the CPU
surface and use the right compound to make the best thermal joint.

I just replaced the fan with a faster one. Lost 20C. I\'d forgotten how shit some fans are. 1100rpm to 4000rpm!

Yeah, it\'s not uncommon for people to rush to a solution before they have all the facts. Still wanting to stack heat sinks?

I\'ll correct that for you, \"it\'s common for people....\" You do like to do things the longwinded way don\'t you? Stacking the heatsink was the easiest way to fix the problem.

No need to correct anything, it was perfectly correct the first time and you now have altered the meaning.

No. It meant precisely what you did. I removed two negatives. As any mathematician will tell you, two negatives make a positive. Eg., \"I don\'t doubt it\" means \"I think so\".

Not really. You altered the meaning because you are limiting your thinking to a binary choice. It\'s not binary.

English is not precise like maths. \"Uncommon\" could be 1% or 5%.

So what name did you used to post under? You didn\'t answer that.

Several. Offhand I can think of Lieutenant Scott and Uncle Peter.

Ok, then you aren\'t the guy I was thinking of.

Stacking heat sinks is not likely to \"fix\" anything. It may gain you some minimal reduction of temperature at the CPU but I expect \"minimal\" to be the important word there.

In the end you have found the real problem that needed to be \"fixed\", a defective fan.

Not defective per se, just shit. Strangely the same model of fan and heatsink cools the other three CPUs ok. Either one CPU runs hotter as it\'s buggered, or the motherboard voltage regulation for it is off, or that area has warmer air in it.

Yes, defective. You said it ran slower than the others, so not working correctly. A fan is a very simple device. Hard to say it\'s not working right without being \"defective\".

I never said the fan was slower. Four brand new identical fans, all appear the same.
 
On Mon, 27 Jul 2020 00:04:16 +0100, John Doe <always.look@message.header> wrote:

> Silly troll...

Learn to use a killfile.
 

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