How do I calculate this?

If an AMD processor with no special power-saving features is drawing 200 Watts
while running at 2 GHz with a 200Mhz Front side buss, How many watts will it
draw while running at 1 GHz with a 100Mhz FFB? 100W? Is that the formula,
half the frequency means half the heat generated? Or is it more complicated
than that?

 

[Larry Brasfield]

"Paul Keinanen" <keinanen@sci.fi> wrote in message
newsqof61l8ivddnsf0thb1cohjaeemigtr4l@4ax.com...

On Thu, 21 Apr 2005 10:02:30 -0700, "Larry Brasfield"
donotspam_larry_brasfield@hotmail.com> wrote:

I.Hope.The. Pope@Purges.The.Pedophiles> wrote in message
news:116fmgvf5bq55e7@news.supernews.com...

If an AMD processor with no special power-saving features is drawing 200 Watts
while running at 2 GHz with a 200Mhz Front side buss, How many watts will it
draw while running at 1 GHz with a 100Mhz FFB? 100W? Is that the formula,
half the frequency means half the heat generated?

That is very close for CMOS logic, such as
comprises most of modern microprocessors.

Or is it more complicated than that?

Not enough so to worry about.

Except that at 1 GHz, the processor would be able to run at a lower
core voltage. The power dissipation is proportional to the core
voltage squared.

The OP strongly implied that unmentioned variables
were unchanged. His question makes little sense
otherwise. If we must mention all those variables,
we should include loading on the uP pins, nature
of the code being run, its time dependencies, etc.

--
--Larry Brasfield
email: donotspam_larry_brasfield@hotmail.com
Above views may belong only to me.