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Question about overclocked Core i7 920 CPU/Core Temps

Last response: in Overclocking
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September 25, 2009 2:22:18 PM

I am currently running an i7 920 overclocked to 3.3 ghz on an EVGA x58 LE board. Using the Zalman CNPS10X Extreme(linked below), my maximum load temperatures are usually about 50c cpu temp, and 62-64c core temperatures as read from the EVGA Eleet tool. Every thread I have read about overclocking this processor says it's core temps should only be about 5c higher than the CPU temperature. Can anybody tell me why my cores run 10-12c hotter than the cpu? I am hesitant to overclock this thing any more because of those core temps.

Thanks a lot in advance.


system specs:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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September 25, 2009 6:32:36 PM

BranC85 said:
i7 920 overclocked to 3.3 ghz ... maximum load temperatures are usually about 50c cpu temp, and 62-64c core temperatures as read from the EVGA Eleet tool ... core temps should only be about 5c higher than the CPU temperature. Can anybody tell me why my cores run 10-12c hotter than the cpu? I am hesitant to overclock this thing any more because of those core temps.

Please be more specific.

What case?

What ambient?

What Vcore?

Which load test?

For how long?

Have you tried flashing your BIOS?

Have you tried SpeedFan and Real Temp for comparisons?

If the Gradient between CPU temperature and "mean" (average) Core temperature is not ~ 5c during Prime95 Small FFT's, then it's most likely that BIOS is miscoded, which affects the accuracy of CPU temperature only. Core temperatures on i7 variants are typically accurate to within a few degrees, however, you'll probably find that if you follow the Test Setup in Section 9 of the Temperature Guide, (linked in my signature), that your CPU temperature will idle below ambient, which is clearly wrong, and will prove that BIOS is miscoded. CPU temperature and Core temperatures can be individually calibrated in SpeedFan by following Section 11 in the Temperature Guide.

Comp :sol: 
September 28, 2009 7:31:30 PM

CompuTronix said:
Please be more specific.

What case?

What ambient?

What Vcore?

Which load test?

For how long?

Have you tried flashing your BIOS?

Have you tried SpeedFan and Real Temp for comparisons?

If the Gradient between CPU temperature and "mean" (average) Core temperature is not ~ 5c during Prime95 Small FFT's, then it's most likely that BIOS is miscoded, which affects the accuracy of CPU temperature only. Core temperatures on i7 variants are typically accurate to within a few degrees, however, you'll probably find that if you follow the Test Setup in Section 9 of the Temperature Guide, (linked in my signature), that your CPU temperature will idle below ambient, which is clearly wrong, and will prove that BIOS is miscoded. CPU temperature and Core temperatures can be individually calibrated in SpeedFan by following Section 11 in the Temperature Guide.

Comp :sol: 



My case is here: http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I also have a thermaltake case fan that moves a lot of air so I do not think airflow is an issue. Ambient is approximately 22c. I have not flashed my BIOS but I have not heard of anybody having this issue on the EVGA forums for the LE board. I haven't used Speedfan yet, although if ELEET is relatively accurate as you said for measuring core temperatures, isnt 64c still rather hot for 3.3 ghz?

My Vcore is 1.32, it is automatically set by the board when using the dummy OC feature. I used that for now because I have not overclocked before and did not want to take any risks with a new system. Is that too much voltage?

Does running at a higher clock speed with the same voltage increase the heat much? Or is the heat mostly generated by the voltage?

Thanks again.
!