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Uneven core temps, any ideas?

post #1 of 8
Thread Starter 
Whenever I run benchmarking and 'Real Temp' I always notice that cores 1 & 4 seem to operate at temps 9-10C higher than cores 2 & 3...

420

See the maximum values after a run I did, 69/60/60/70. Even at idle you can see a small difference between each core especially on core 4.

Any ideas that could be causing this? I use a Hydro H100 Liquid Cooler but I did use some 4 year old Arctic Silver paste when I fitted it (it's all I had at the time), could this be the issue? Do I need to 'lap' my Heatsink?

Before anyone asks all the BIOS settings are the same for each core and I have the latest BIOS version.
post #2 of 8
This is normal..1 core is generally 9-11c cooler..no big whoop.
 
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Thuban Powah!
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post #3 of 8
Thread Starter 
Cheers Schmucky. I've just read the following on another board...
Quote:
It's normal.

For 1 the these "temp" sensors are not designed for reading temps anyway. They are for thermal protection shutdown. And for this purpose they are very accurate around the 100*C mark. The further you get from that, though, the less accurate they become.

Interesting, you learn something new everyday!
post #4 of 8
Quote:
Originally Posted by estebanrey View Post

Cheers Schmucky. I've just read the following on another board...
Quote:
It's normal.
For 1 the these "temp" sensors are not designed for reading temps anyway. They are for thermal protection shutdown. And for this purpose they are very accurate around the 100*C mark. The further you get from that, though, the less accurate they become.
Interesting, you learn something new everyday!

Also, I would assume the middle two are hotter because they are surrounded by other heat producing cores, compared to the outer two....
post #5 of 8
Schmuckley is right. I have an i7 920 and the temps do pretty much the same thing. I've heard that it can be caused by how thick or thin the thermal paste is over that core but I cannot confirm or deny that.

Only way you need to worry is if any of them go crazy high (100c).
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post #6 of 8
Thread Starter 
Quote:
Originally Posted by Klinkey View Post

Also, I would assume the middle two are hotter because they are surrounded by other heat producing cores, compared to the outer two....

The middle two cores are cooler, not hotter so that blows you theory wink.gif
post #7 of 8
you will always have 1 core hotter than the other one due to turbo boost. It constantly has core 1 on my 950 clocked higher so its always 2-5c higher than my other cores. If ya want more even temps turn off turbo boost lol.
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post #8 of 8
Intel uses temperature sensors that are only accurate to +/- 5C so some sensors might read up to 5C too high and some other cores might read up to 5C too low. The end result is that a spread of 10C between cores is completely meaningless.

Prime95 Small FFTs used to be the best test to work the cores equally and consistently but you will still see a large spread simply due to sensor error.

Intel uses sensors that are only designed and intended to be used for thermal throttle and thermal shutdown control. They are not good enough to provide 100% accurate core temperatures from idle to full load.
Edited by unclewebb - 4/12/12 at 9:38pm
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