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E8500 core 0 to 1 differ by 18Deg C ???

post #1 of 5
Thread Starter 
Got this mobo/cpu/fansink already assembled a while back and thought maybe the TIM was unevenly spread or partially missing so today I re-installed the fansink with AS5 applied.


This is a SS of HWM after running a WEI test. Stock clocks and volts.




The cooler is a Zalman CNPS9700LED

I shimmed the retainer bracket to get more pressure to the cpu which helped temps 4-7 deg C but the weird temperature differential between cores still persists. I haven't expeienced this with other C2D cpu's.

Any ideas?
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post #2 of 5
Instal Real Temp and then report back.
Could be bad thermal paste spread as well.
Core could be unstable so its not working at 100% but 0 and generates 0 heat while other core is at 100% and generates heat.
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post #3 of 5
Thread Starter 
Core temp after a WEI test.



Bad TIM application is ruled out since I did it myself again today. I can run P95 to see if I can get one of the cores to error.
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post #4 of 5
Thread Starter 
Stressed each core separately with Prime95 and no instability on either. Core 0 just runs hotter by the same amount no matter what. I'm wondering if its false reporting from the ITE super IO chip or the hotter core has less affinity to the integrated heat spreader. Thanks for taking a look.
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post #5 of 5
Is this a C0 stepping CPU, by any chance?

My old Core 2 Duo E8400 C0 stepping acted in a similar fashion. The CPU was one temperature, the first core was ~10C warmer, and the second core ~10C warmer still. The variance was there on two different heatsinks (Arctic Cooling Freezer 7 Pro and Xigmatek HDT s1283), and was there regardless of how I tried applying the thermal compound and heatsink, or how I had the CPU configured.

My Core 2 Duo E8600 (all of which are E0 stepping) is seemingly much more consistent, as all three temperatures are nearly exactly the same (assuming similar load level).

The sensors in many early Wolfdale CPUs were known to be iffy, but especially so for the C0 stepping ones. If your CPU is an E0 stepping, it's still probably the same thing.
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