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Help with steep Temperature Variance

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  • Intel i7
  • Temperature
  • CPUs
Last response: in CPUs
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June 18, 2014 8:15:31 PM

Is it normal for the temperature to vary steeply between cores? I have a Core i7 4930k OC'd to 4.5ghz with a Corsair h100i cooler. Temps vary sometimes over 10 degrees between cores! Is this normal? I've included a screenshot of my coretemp gadget for reference.



As you can see, there is a 9 degree difference between core 0 and 3. BTW, like most ppl, I have my CPU set to auto down-throttle when idling to save power, which is why its only clocked at 1.2ghz in the picture.

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June 18, 2014 9:37:27 PM

All quite normal. This is explained in the Intel Temperature Guide - http://www.tomshardware.com/forum/id-1800828/intel-temp...

From the Guide:

"(2) 3rd and 4th generation processors use Thermal Interface Material (TIM) between the top of the Die and the underside of the IHS instead of fluxless solder, which was used in 2nd generation and earlier processors, so heat transfer is again less efficient.

Since the bonding material which seals the perimeter of the IHS to the package is slightly too thick, this tends to increase the space between the underside of the IHS and the Die, which can cause the TIM to compress unevenly. The effect of this manufacturing procedure is that many processors show a wide variation between Core temperatures, or one Core which runs much hotter than it's neighbors. This has encouraged some enthusiasts to "de-lid" or remove their processor's IHS, which basically involves thoroughly removing the bonding material, replacing only the TIM and then restoring the IHS.

Typical results are significantly lower Core temperatures and less variation between Cores. There are a few excellent YouTube videos detailing the methods used, but beware that it will of course void your warranty, and it is not at all difficult to damage or destroy your processor.

However, Intel has addressed these thermal issues in their Haswell refresh. The Devil's Canyon processors, i5 4690K and i7 4790K, have an improved IHS and TIM, both of which increase thermal efficiency."

CT :sol: 
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June 18, 2014 9:58:36 PM

Is it hard to de-lid the CPU? is it as easy as it sounds? just pop the lid off, use some arctic silver on it and then stick it back on?
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June 19, 2014 10:03:42 AM

"There are a few excellent YouTube videos detailing the methods used, but beware that it will of course void your warranty, and it is not at all difficult to damage or destroy your processor".
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June 19, 2014 7:40:00 PM

Yes, I know how to read. I'm asking if anyone has personal experience. A how-to video isnt a good source for polling user experience. Has anyone actually tried/successfully completed the de-lidding process? Is it really worth it? Performance gains noticeable? etc, etc...
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June 19, 2014 8:25:36 PM

Fixing Haswell and Ivy Bridge CPU temps: IHS removal - http://www.youtube.com/watch?v=XXs0I5kuoX4

This video is the best I've seen. If it doesn't answer your questions, then perhaps you may want to start a new thread specific to de-lidding.

CT :sol: 
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