Prime 95 Overheating (4790k)

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M

Montreux

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Dec 30, 2013
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Hi,

I was just running some stress test at stock speed with the 4790k on an Asus VII hero motherboard. The cooler Im using is the corsair h100i.

When under 100% load, the CPU temperature ramps up to 95~100C on core 1,2 and 3, but when idling, all cores at at ~30ish. The ambient temperature is about 18~20C.

I have already tried multiple times to remount and reapply the thermal paste, but the results are still the same....so whats wrong?

thanks
 
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Andrew Buck

Andrew Buck

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Jan 28, 2014
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You should be fine. The reasoning for that is that Haswell doesn't like Prime95. I am the same way with Prime95 with my 4770K, but with AIDA64 (http://www.aida64.com/downloads) I do not get close.
 
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Y

Y0GI

Splendid
Jul 22, 2013
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I must disagree with this.

I ran Prime 95 at 4.6 GHz OC and my max temp after 3 hrs. was 82*C on CoreTemp.

If the OP is going up to 100*C. then something is not right.

Yogi

 
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Andrew Buck

Andrew Buck

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Jan 28, 2014
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My 4770K does the same thing. Try running AIDA64 stress test and see what happens there.
 
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M

Montreux

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Dec 30, 2013
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Just an update. The problem has been resolved!

Turns out it was the backplate of the h100i being too loose and I had to find some rubber washers (from the hdd tray...lol) to secure the installation. Prime 95 now runs at 65C tops!

Thanks everyone for your help!
 
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Andrew Buck

Andrew Buck

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Jan 28, 2014
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Damn. I need to try to tighten my cooler.
 
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T

titanHUNTER

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Jun 24, 2014
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LMAO...Ha Ha ha there goes that expert judgment! Let's try NOT to generalize about an entire family of CPUs (ALL of them do not like Prime95???) without first checking out the issues.
 
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Andrew Buck

Andrew Buck

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Jan 28, 2014
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Haswell just usually doesn't like Prime95. The instruction set it uses is very intensive on Haswell Processors.
 
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Andrew Buck

Andrew Buck

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Jan 28, 2014
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How can you judge my knowledge from my previous post? Prime95 uses the AVX2 (Advanced Vector Extensions 2) instruction set, which is very demanding on Haswell chips and it utilizes part of the chip that does not transfer heat away quite as efficiently. I could have explained it if you asked instead of questioning my knowledge.
 
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A

A very old guy

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Oct 30, 2014
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It is just like a slap on the face isn't it lol
Sorry for digging out the old thread but Andrew I must agree with you
Certain version of prime 95 just doesn't go with at least some 4790K, it is happening around me.
I finished my z97 build while you guys start this thread and it is the same story again and again to me and 7 others I know.

I think Op is one of the 50% lucky Haswell consumer

 
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R

Ryan Boyle

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Dec 24, 2014
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Certain motherboards for the haswell refresh are incompatible with certain heatsinks, even the stock heatsink that comes with the i7-4790K. The heatsink will have a hairline gap on one side causing you to have abnormally high temps.
 
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CompuTronix

CompuTronix

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Nov 13, 2006
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Andy,

Respectfully sir, you are misinformed, and are spreading misinformation. Please stop. There's no best answer for misinformation. You have therefore been unselected.

Guys,

Please read this Tom's Sticky: Intel Temperature Guide - http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html

From Section 12:

" ... Core i 2nd, 3rd and 4th Generation CPU's have AVX (Advanced Vector Extension) instruction sets. Recent versions of Prime95 run AVX code on the Floating Point Unit (FPU) math coprocessor, which produces unrealistically high temperatures. The FPU test in the software utility AIDA64 shows the same results.

Prime95 v26.6 produces temperatures on 3rd and 4th 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 35% larger Die. ... "

This is a 22 nanometer problem common to 3rd generation Ivy Bridge and 4th generation Haswell / Devil's Canyon processors.

For those of you who need proof, seeing is believing. Please download Prime95 version 26.6 - http://windows-downloads-center.blogspot.com/2011/04/prime95-266.html

Run Small FFT's for 10 minutes then compare your core temperatures with P95's latest version, 28.5.

Your core temperatures will test 10 to 20C lower.

CT :sol:
 
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