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Reached 3.8Ghz, but have a question !

post #1 of 4
Thread Starter 
Ok, i've finally reached 3.8Ghz with my CPU and stable, with 1.256V and cpu differential amplitude to 800mV

But my IMC Voltage from the BIOS cranked up to 1.219V

Isn't that voltage too high ?

On stock cpu frequency that voltage is set to 1.1V


So that voltage is ok, or i need to reduce it a little ?
Edited by CalinTM - 11/16/11 at 1:56pm
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post #2 of 4
The intel lynnfield spec max vtt is 1.4v, so you are well under that. I need 1.23v vtt for my 3.8Ghz 860 OC and it's still going strong after nearly two years. As for 'safe' vtt, intel recommend no more that 5% beyond nonimal, which is 1.155v.
post #3 of 4
Thread Starter 
Why no more than 1.155V

If i overclock the CPU that voltage bumps from 1.1V to 1.219V
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post #4 of 4
The Intel spec recommends using no more that 1.155v vtt to assure maximum reliablity and longevity. When using a vtt beyond that you'll possibly have less than max R & L (according to Intel); how much the loss is no one really knows, but beyond the 1.4v max spec vtt you will most likely damage your chip sooner or later. So there's the OC dilemma: do you want max R & L, or max performance? You have to decide.

OC tools, which I'm guessing is what you are using, are tuned to hit stable OC's using voltages are reliable for the desired OC. Beware that OC tools usually use excessive voltages for all voltage settings. Your computer might not really need 1.21v vtt, but it's tried and true for that tool. Direct BIOS OC tuning is the best way to go (but maybe you already know this).
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