6700k gets over 90°c when using prime95

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Nathan_947

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Nov 24, 2016
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Hello,

A few days ago I build my own gaming PC. Everything went well.

Only thing is when stress testing my Intel 6700k with over 90°c. I used HWMonitor for measuring and Prime95 for stress testing.

When my idle the CPU is around 24°c. When playing it will be 65°c max. I tested with ARK on Epic settings and Rust on the highest settings.

For cooling I use the Cooler Master TX3 Evo. First time I installed it I used too much thermal paste(it was coming out the sides) so a day later I replaced the cooler and cleaned the heatsink and cpu with a toilet paper and alcohol (70%)

Then I put it back in with a pea-sized drop of thermal paste and put the heatsink on and put the pins in using the push-twist clockwise method.

After that the temps dropped to 90°c when testing (was 100°c before).

What is going on?
 
Solution
CompuTronix
Nathan_947,

On behalf of Tom's Moderator Team, welcome aboard!

Concerning Prime95, it's likely that you ran one of the latest versions. Just in case you didn't get the Memo, Intel recommends that you do NOT run any versions of Prime95 later than 26.6. Here's why:

Core i 2nd through 6th Generation CPU's have AVX (Advanced Vector Extension) instruction sets. Recent versions of Prime95, such as 28.9, run AVX code on the Floating Point Unit (FPU) math coprocessor, which produces unrealistically high temperatures. The FPU test in the utility AIDA64 shows similar results.

Prime95 v26.6 produces temperatures on 3rd through 6th Generation processors more consistent with 2nd Generation, which also have AVX...
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CompuTronix

CompuTronix

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Nov 13, 2006
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Nathan_947,

On behalf of Tom's Moderator Team, welcome aboard!

Concerning Prime95, it's likely that you ran one of the latest versions. Just in case you didn't get the Memo, Intel recommends that you do NOT run any versions of Prime95 later than 26.6. Here's why:

Core i 2nd through 6th Generation CPU's have AVX (Advanced Vector Extension) instruction sets. Recent versions of Prime95, such as 28.9, run AVX code on the Floating Point Unit (FPU) math coprocessor, which produces unrealistically high temperatures. The FPU test in the utility AIDA64 shows similar results.

Prime95 v26.6 produces temperatures on 3rd through 6th Generation processors more consistent with 2nd Generation, which also have AVX instructions, but do not suffer from thermal extremes due to having a soldered Integrated Heat Spreader and a significantly larger Die.

Please download Prime95 version 26.6 - http://windows-downloads-center.blogspot.com/2011/04/prime95-266.html

Run only Small FFT’s for 10 minutes.

Use Core Temp to measure your temperatures - http://www.alcpu.com/CoreTemp

Your Core temperatures will test 10 to 20C lower with v26.6 than with v28.9.

Also, at the top of each of our Forums you will see "Stickies" which are references permanently available for everyone's benefit. Near the top of this Forum (CPU's) you will see this Sticky: Intel Temperature Guide - http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html

You might want to give it a read.

CT :sol:
 
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xFeaRDom

xFeaRDom

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Jul 28, 2016
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Adding onto what @CompuTronix said, there are other programs that you can use that can provide somewhat realistic temperatues.

Something such as Intel Extreme Tuning Utility, this of which is my favourite for CPU testing, as from what I've seen, it stresses your CPU really similarly to when you're gaming or doing other intensive things, and I always guess my CPU temperatures close to correctly.

So you can back up your confidence with CPU temperatures using this, I have also used something called OCCT, which also seems like a really nice software to use and test your CPU with, not sure if there's any issues with the more updated versions though.
 
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xFeaRDom

xFeaRDom

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Jul 28, 2016
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No worries, just wanted to add an extra suggestion to ensure that you believe the temperatures are correct, and you can more or less wind it down to a specific temperature. In your case it will probably be around 70c, probably lower as you said.
 
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Nathan_947

Commendable
Nov 24, 2016
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Yeah, It worked. now it won't go over 80 degrees and it usually stays around 76 degrees while testing. Thanks so much! I worried 2 days for nothing! :D

 
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