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Underclocking an i7 920?

post #1 of 3
Thread Starter 
Hey guys so i was thinking of underclocking an extra i7 920 i have (to save the money of buying a new processor also since i have a mobo too) to use in a server/media center.

I was wondering if i underclock it would it save a good amount of power, if i was to underclock it to say 1.33ghz would it consume 50% less power or would it be 15-25%?

Also from what i read online it sounds safe to underclock, but i just wanted to confirm that it shouldn't damage anything.

Thanks for the help!
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post #2 of 3
Well, it depends how much voltage it takes to underclock it to 1.33Ghz.

A stock i7 920 at ~1.1V consumes 103W at idle and 196W at full load.
So refer back to your stock voltage, and whatever percentage of your stock voltage you're using, you are consuming less by that amount.

Here's an example:
(I do not know the voltages for underclocking, you need to find it out by trial and error)
But say, you need 0.5V for 1.33Ghz, then you have reduced your power consumption by 55% (1 -0.5V/1.1V) and you're running the CPU at 45% of the stock voltage. Consequently, your processor would consume 46W at idle and 88W at full load (45% of stock figures since you're only applying 45% of the stock voltage).

I hope this makes sense. Also, underclocking will not damage any of your components, actually it is much safer than overclocking.
Edited by born2bwild - 2/14/11 at 4:31pm
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post #3 of 3
Thread Starter 
Quote:
Originally Posted by born2bwild View Post
Well, it depends how much voltage it takes to underclock it to 1.33Ghz.

A stock i7 920 at ~1.1V consumes 103W at idle and 196W at full load.
So refer back to your stock voltage, and whatever percentage of your stock voltage you're using, you are consuming less by that amount.

Here's an example:
(I do not know the voltages for underclocking, you need to find it out by trial and error)
But say, you need 0.5V for 1.33Ghz, then you have reduced your power consumption by 55% (1 -0.5V/1.1V) and so you're running it at 45% of the stock voltage. Consequently, your processor would consume 46W at idle and 88W at full load (45% of stock figures since you're only applying 45% of the stock voltage).

I hope this makes sense.
ah okay so it has to do with the voltage, i know this cpu takes a few more volts (1.38 to get to 4ghz) so i guess ill have to see later what it needs
Thanks + rep
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