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i7 920 d0 @ 4Ghz. Higher Temps at lower Vcore ??

post #1 of 12
Thread Starter 
I am currently finishing my 4.0Ghz overclock on my i7 920 d0.

I got it stable at 4.0Ghz with:
1.24375V Vcore
1.19500V VTT
Max temps: 76 oC

But I also got it stable at
1.23750V Vcore
1.21500V VTT
Max temps: 79oC

Room ambient temp. was the same in both conditions.
How can I get higher temps on a lower Vcore ? Is that even possible :S ?

Thanks !
post #2 of 12
Quote:
Originally Posted by Freekers View Post
I am currently finishing my 4.0Ghz overclock on my i7 920 d0.

I got it stable at 4.0Ghz with:
1.24375V Vcore
1.19500V VTT
Max temps: 76 oC

But I also got it stable at
1.23750V Vcore
1.21500V VTT
Max temps: 79oC

Room ambient temp. was the same in both conditions.
How can I get higher temps on a lower Vcore ? Is that even possible :S ?

Thanks !
Lower your vtt and report back on the temps
post #3 of 12
Thread Starter 
Quote:
Originally Posted by konspiracy View Post
Lower your vtt and report back on the temps
I cannot lower the VTT any more, else the overclock becomes unstable.
post #4 of 12
It'll be an anomaly in the results, my guess is that it isn't accurate.

I'd test it a few times and get an average - test it at different times of the day and accurately record the ambient each time you do so. There is no reason it would get hotter with a lower vcore besides the case (and room) being hotter at the time of testing.
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post #5 of 12
Why would you want higher temps?
    
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post #6 of 12
Does your mobo supprt loadline calibration? lowering the voltage to much might cause spikes.
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post #7 of 12
Thread Starter 
Quote:
Originally Posted by jNSK View Post
It'll be an anomaly in the results, my guess is that it isn't accurate.

I'd test it a few times and get an average - test it at different times of the day and accurately record the ambient each time you do so. There is no reason it would get hotter with a lower vcore besides the case (and room) being hotter at the time of testing.
Thanks for the tip !

Quote:
Originally Posted by Vipr3 View Post
Why would you want higher temps?
I don't. That's why I am lowering my Vcore, since (usually) lower Vcore, means lower temps.. but now, I am seeing the opposite. That's why I ask here if it's normal.

Quote:
Originally Posted by Vap0r87 View Post
Does your mobo supprt loadline calibration? lowering the voltage to much might cause spikes.
Yes, it supports LLC. I have it set to level 2 (moderatly adjust Vdroop).
That might be plausible what you are saying there ! Thanks for the input !
post #8 of 12
Even though its less vcore/vtt its not really a big enough change to make any difference. Sounds more like heatsoak like an air to air car intercooler suffers from after heavy runs in the same ambient. Give it some time to cool down before making another attempt.
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post #9 of 12
If there is no difference in clock speed or ambient temps, less voltage should always mean lower CPU temperature.

Unless you were doing something that was taking cycles away from the stress test in the higher voltage test, or it was so unstable that errors were interfering with load, it's a fluke.
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post #10 of 12
Thread Starter 
Thanks for the replies guys !
Apparantly, I spoke to soon. The overclock at 1.23750Vcore and 1.215V VTT just failed after 149 linx runs so it means the overclock just wasn't stable and that was causing the higher temps I guess

Quote:
Originally Posted by Blameless View Post
or it was so unstable that errors were interfering with load
Yup, apparantly, you were right

I know enough guys ! Thanks for the input
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