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Effective undervolting/clocking - how?

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  • CPUs
  • Power Consumption
  • Overclocking
Last response: in Overclocking
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December 7, 2011 11:59:01 AM

Hola,
I have a server (E5200 + GA-G41M-ES2L + 2 HDDs) – naturally in this case, speed is much less important than power consumption. So I thought it would be a good idea to toy around voltages: I whipped out my cheap power consumption meter, and entered the BIOS.

I found very little usable info on how to effectively do this, so what I did was simply lower the multiplier to the minimum and lower the vCore step by step. I've gone down to 0.85 (from the default 1.2), but – while the system was stabile, I found no traces of lower consumption.

Before the system idled at around 48W, after the setting it was like 45-46W. As I have a cheap measuring device (with a fault rate of prop. 3-4W), this could be next to nothing.

Is there something I did wrong? What is the lowest Watt rate one can get via such settings?
Thanks

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December 8, 2011 6:04:00 AM

What are you using to measure power?

Intel CPU's are pretty efficient when idling. Undervolting will not save that much power.
December 8, 2011 8:06:34 AM

this: http://tinyurl.com/d2t7a2h
cheap and not that much accurate but it can give you a rough estimate.

I realised the same thing, by throwing out useless case fans I've managed to get down to 40W idling. Not bad for this setup... Even so, next time I build a server I'd consider a mobo that supports Atom CPU.
!