Adjustable ATX P/S.

[Maurie Daly]

Anyone know of there are any ATX supplies available where you can
adjust the +5V rail slightly (ie like up to about 5.5 V.)
Ive got a power hungry M/B which seems to be sensitive to low volts on
the +5V rail, and whilst the P/S makes +5 V exactly on its PCB , by
the time you get to the molex plug on the M/B the volts are down to
4.7 V .
Ideally , a P/S which sensed the +5V rail at the M/B plug would be the
ideal fix, but Ive not found any that do this.

tnx

 

[amstereo - matt2]

ur pulling too much power throguh either the 3.3 or 5v line for the psu -
athlon/duron system?

get a higher quality psu, codegen are cheap and reliable as hell ~$40ish
"Maurie Daly" <mauried@tpg.com.au> wrote in message
news:3fa8ea86.50309084@dnews.tpgi.com.au...

Anyone know of there are any ATX supplies available where you can
adjust the +5V rail slightly (ie like up to about 5.5 V.)
Ive got a power hungry M/B which seems to be sensitive to low volts on
the +5V rail, and whilst the P/S makes +5 V exactly on its PCB , by
the time you get to the molex plug on the M/B the volts are down to
4.7 V .
Ideally , a P/S which sensed the +5V rail at the M/B plug would be the
ideal fix, but Ive not found any that do this.

tnx

 

[Rod Speed]

Maurie Daly <mauried@tpg.com.au> wrote in message
news:3fa8ea86.50309084@dnews.tpgi.com.au...

Anyone know of there are any ATX supplies available where
you can adjust the +5V rail slightly (ie like up to about 5.5 V.)

Yes, they do exist.
http://www.pccasegear.com.au/prod835.htm

Ive got a power hungry M/B which seems to be sensitive
to low volts on the +5V rail, and whilst the P/S makes
+5 V exactly on its PCB , by the time you get to the
molex plug on the M/B the volts are down to 4.7 V .

You'd be better just replacing that power supply
with one that does allow for that effect by running
the 5V rail a tad higher by default. Much cheaper.

Ideally , a P/S which sensed the +5V rail at the M/B plug
would be the ideal fix, but Ive not found any that do this.

Yeah, remote sensing was never used in the ATX design.
Modern motherboards basically just develop the high current
supplys from the 12V rails, doing the regulation on board.
Thats what the little square 'P4' power connector is about.

There's also the other 6 pin Aux connector too.

 

[GM]

"Rod Speed" <rod_speed@yahoo.com> wrote in message
news:bobn2v$1c8jn3$1@ID-69072.news.uni-berlin.de...

Maurie Daly <mauried@tpg.com.au> wrote in message
news:3fa8ea86.50309084@dnews.tpgi.com.au...

Anyone know of there are any ATX supplies available where
you can adjust the +5V rail slightly (ie like up to about 5.5 V.)

Yes, they do exist.
http://www.pccasegear.com.au/prod835.htm

What is so good about these supplies that they cost big dollars? Do they

have better spike /overvoltage protection than the cheapie chinese ones -
are they worth it etc etc ?

 

[Rod Speed]

GM <nospam_hathill2000@yahoo.com.au> wrote in
message news:3fa977f8$1@news.rivernet.com.au...

Rod Speed <rod_speed@yahoo.com> wrote
Maurie Daly <mauried@tpg.com.au> wrote

Anyone know of there are any ATX supplies available where
you can adjust the +5V rail slightly (ie like up to about 5.5 V.)

Yes, they do exist.
http://www.pccasegear.com.au/prod835.htm

What is so good about these supplies that they cost big dollars?

Nothing. Its just the usual tiny niche market effect.

Do they have better spike /overvoltage protection than
the cheapie chinese ones - are they worth it etc etc ?

In theory at least, they do.

In practice Macase claimed that too and one of their models
was notorious for dying very spectacularly indeed and frying
everything powered from it in its death throws.

For some reason you dont see Macase listed much anymore |-)

 

[amstereo - matt2]

you cant really tell from the out side what a power supply is like. i use
the codegen power supplies which (appart from being cheap) are extra low RF
output, that is, no interference on an AM radio 1 meter away, when the power
supply overloads or receives a short, goes to instant shut down preventling
system damage, stable voltages and 3YR wty.

i judge a power supply by its emitted RF and its ability to cope with split
second power differences.

 

[amstereo - matt2]

and failure rate (2 out of 200 is good) ritmo / sato PSU's are buckets.

 

[Rod Speed]

amstereo - matt2 <amstereo@optusINTERnetDOT.comDOT.auSTRALIA>
wrote in message news:3faa62aa$0$9282$afc38c87@news.optusnet.com.au...

you cant really tell from the out side what a power supply is like.

No one ever said you could.

i use the codegen power supplies which (appart from being cheap)
are extra low RF output, that is, no interference on an AM radio 1
meter away, when the power supply overloads or receives a short,
goes to instant shut down preventling system damage,

All ATX power supplys are supposed to do that.

Doesnt always happen in reality tho, particularly when the supply dies.

stable voltages and 3YR wty.

Does the warranty cover what gets killed when the supply dies ?

i judge a power supply by its emitted RF

Completely useless as far as what most care about, the
supply frying what its supposed to be powering when it dies.

and its ability to cope with split second power differences.

They all do that pretty adequately.

 

[amstereo - matt2]

te fact that the two that i have seen fail (one just a dodgy fan, the other
one blew a cap) have not resulted in ANY damage to the system componants
behind it, it shut of a second before the cap went bang, so it knew somthing
was up prior to somthing happened.
"Rod Speed" <rod_speed@yahoo.com> wrote in message
news:boe8er$1cncr1$1@ID-69072.news.uni-berlin.de...

amstereo - matt2 <amstereo@optusINTERnetDOT.comDOT.auSTRALIA
wrote in message news:3faa62aa$0$9282$afc38c87@news.optusnet.com.au...

you cant really tell from the out side what a power supply is like.

No one ever said you could.

i use the codegen power supplies which (appart from being cheap)
are extra low RF output, that is, no interference on an AM radio 1
meter away, when the power supply overloads or receives a short,
goes to instant shut down preventling system damage,

All ATX power supplys are supposed to do that.

Doesnt always happen in reality tho, particularly when the supply dies.

stable voltages and 3YR wty.

Does the warranty cover what gets killed when the supply dies ?

i judge a power supply by its emitted RF

Completely useless as far as what most care about, the
supply frying what its supposed to be powering when it dies.

and its ability to cope with split second power differences.

They all do that pretty adequately.

 

[Rod Speed]

amstereo - matt2 <amstereo@optusINTERnetDOT.comDOT.auSTRALIA>
wrote in message news:3faaf49d$0$3504$afc38c87@news.optusnet.com.au...

te fact that the two that i have seen fail (one just a dodgy fan, the
other one blew a cap) have not resulted in ANY damage to the system
componants behind it, it shut of a second before the cap went bang,

A properly designed power supply is supposed to have
an independant shutdown mechanism that prevents
the output rails being over voltaged on any failure.

The problem is that sometimes that designed in protection doesnt always work.

so it knew somthing was up prior to somthing happened.

"Rod Speed" <rod_speed@yahoo.com> wrote in message
news:boe8er$1cncr1$1@ID-69072.news.uni-berlin.de...

amstereo - matt2 <amstereo@optusINTERnetDOT.comDOT.auSTRALIA
wrote in message news:3faa62aa$0$9282$afc38c87@news.optusnet.com.au...

you cant really tell from the out side what a power supply is like.

No one ever said you could.

i use the codegen power supplies which (appart from being cheap)
are extra low RF output, that is, no interference on an AM radio 1
meter away, when the power supply overloads or receives a short,
goes to instant shut down preventling system damage,

All ATX power supplys are supposed to do that.

Doesnt always happen in reality tho, particularly when the supply dies.

stable voltages and 3YR wty.

Does the warranty cover what gets killed when the supply dies ?

i judge a power supply by its emitted RF

Completely useless as far as what most care about, the
supply frying what its supposed to be powering when it dies.

and its ability to cope with split second power differences.

They all do that pretty adequately.