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Does aggressive CPU cooling allow lower VCore?

post #1 of 14
Thread Starter 
A tech question really...we cool to achieve a maximum overclock frequency, or to achieve the lowest temperature for a given OC frequency, but...

wondering if I were to pursue every means known to man to cool my CPU (e.g. lapping, water with fatter rads, higher RPM/CFM fans, top-shelf TIM, even piping in cool Canadian winter air!), would the resulting lower temperatures allow for the *same* overclock frequency to be achieved but at a lower VCore? In otherwords, could I lower my VCore and still achieve prime95 stability that I did with more VCore and higher temps?

Or is VCore a function of the chip only and not its temperature?


T.

core i7 860 @4.2 GHz 1.41V, 16 GB DDR3 @2000 MHz 9-9-9-24, Corsair H70 modded with res, Gigabyte P55A-UD3P
Edited by tfoss - 4/4/11 at 9:14pm
post #2 of 14
No it does not. all it does is cool the chip err the cooling I mean
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post #3 of 14
Just the opposite, the cooler it is the more voltage you can add!!
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post #4 of 14
Actually during february when it was really cold i experimented and found that i could lower the vcore a small amount the colder it got. I have not been able to figure out why but it did. Not a large movement something like 1.33 to 1.31 but that small amount did intrigue me. right now. 1.31 will not be stable on my system at all. I still dont understand it.
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post #5 of 14
Lower cpu temps mean there is less resistance inside the cpu (The wires' resistance gets higher the hotter they are), with less resistance you could use less voltage. (Also a more stable PSU could do it another way as the voltage you set fluctuates up and down, so we have to raise it so that the lowest dip in it still has it stable, but with less fluctuation we can set the overall voltage lower, with out its ups and downs going below what is needed for a stable overclock)
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post #6 of 14
cooler= lower resistance in the silicon alloy. This means you can push more voltage through the transistors without bursting through the gates. Or you can yes use a lower vcore, it is possible and i have done it.
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post #7 of 14
Quote:
Originally Posted by Sin0822 View Post
cooler= lower resistance in the silicon alloy. This means you can push more voltage through the transistors without bursting through the gates. Or you can yes use a lower vcore, it is possible and i have done it.
I always thought with heat, electron migration was the issue? Sry, been up late so I could be wrong, but I the overall statement of yes you can lower vcore with better cooling, is true .
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post #8 of 14
Thread Starter 
Donkru et al.;
This kinda makes sense to me, from my naive understanding of Ohm's law. Lower temps mean lower resistance, which means to drive a fixed current through a circuit then requires less voltage to achieve. I too experimented with piped-in winter air and while I didn't quantify the results, found that a slightly lower VCore could be used for prime95 stability. But mainly I was using the winter air to prevent my VRMs from catching fire in my unsinked P55M-UD2 board (they used to get quite toasty and smell while prime was running).
Edited by tfoss - 4/4/11 at 9:26pm
post #9 of 14
in short yes it does.
    
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post #10 of 14
Thread Starter 
Reason I'm asking is I've got my i7860 singing at 4.2 GHz 24/7, after upgrading to 16 Gb of RAM drove up my VCore and VTT by one or two notches to get all four sticks stable at 2 GHz. Now I've got VCore at 1.41V just a tad higher than Intel's absolute max, so I thought I'd pursue cooling options more and see if I can get things stable at 1.4V or under that way. I think 4.2GHz is the max I'll achieve within this absolute limit.
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