[mythtv-users] CPU power (was Possible small HD frontend)

Henry A Harper III hah at alumni.rice.edu
Sat Mar 22 17:01:38 UTC 2008


> So slowing the clock is just a thermal issue? The same amount of work
> over a longer time would require heat to be removed at a slower rate,
> thus allowing slower fans?
>
> Slowing the clock is certainly touted as "green" in a lot of circles,
> but it wouldn't surprise me if it is marketing and not engineering. I
> seriously doubt the power saved by slowing the fan(s) would be
> significant.

The power savings comes not from fan slowing, but from also lowering the
CPU's core voltage in tandem with the frequency slowdown. P=VI.
http://www.amd.com/us-en/assets/content_type/DownloadableAssets/Cool_N_Quiet
_Installation_Guide3.pdf
http://www.silentpcreview.com/article172-page1.html
http://en.wikipedia.org/wiki/Cool'n'Quiet




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