CPU running hot after re applying thermal paste and changing cooler

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x3zzi40z

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Nov 9, 2012
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I recently changed the stock cooler in my system for a H80i which i had on my other system, temps used to reach around 70-80c after long gaming sessions but they are now reaching 80c constantly. I cleaned the CPU using the akasa cleaning kit then used the paste provided using the dot method. I have done this twice thinking it was my error at first but no better the second time.

After running prime95 for around 20 minutes the CPU temp maxed out at 94C.

System specs:

Mobo - MSI Z87M-G43
CPU - i5 4670k
CPU Cooler - H80i
GPU - XFX 290
RAM - 8GB Corsair vengeance
Case - Aero cool cube case (think this may be the problem)
Operating system - Windows 7 64bit
PSU - Corsair CX600M

Any help is appreciated
 
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synphul

synphul

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Mar 11, 2011
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Have you checked that both of the tubes in and out of the cpu block are warm? (to ensure it's cycling through properly). What version of prime95 are you running? I'm assuming you tightened it down in an alternating pattern to get it mounted nice and flat to the cpu. How high is it overclocked or is that at stock speeds? 70-80c sounds really high for gaming use although I'm not familiar with 'normal' temps for the h80i. Maybe it's just reaching it's cooling capacity limits?
 
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x3zzi40z

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Nov 9, 2012
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- Just checked both pipes, they are both warm
- I am using prime95 28.5
- I tightened one corner then the opposite, repeating of the other 2 just doing a little at a time
- 70-80c was after gaming sessions of around 12hours and in the middle of summer(not tested during winter)
 
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synphul

synphul

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Mar 11, 2011
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I guess depending on the room and case temps, it might be normal to hit 70-80 during gaming in summer. It's a water cooler but doesn't really have the efficiency or capacity to cool the way people associate with watercooling under load because of it's relatively small size. Seems to be a typical problem with single radiator aio coolers (they don't really cool any better than air and air coolers sometimes cool better). The smaller aio's have an advantage when moving the case around (lan parties and things like that) due to a little less stress on the motherboard.

Try prime 95 v26.6 and use small fft's and see if your temps change.
http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html

Newer versions of prime95 invoke avx instructions that overwork the haswell and devil's canyon cpu's and tends to report a higher than reasonable temp since it loads the cpu way more than max (and normal use/gaming max load should still be under max stress test).
 
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synphul

synphul

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Mar 11, 2011
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I'm not sure about that one, and it depends on your overclock. For a mild overclock, a hyper 212+ or evo would do decent and they're cheap, along with a cryorig h5 or scythe kotetsu. For a bigger overclock you may want to look into the phanteks tc14pe or a noctua nh-d14, cryorig r1, be quiet dark rock 3/pro 3 etc for air cooling or a dual radiator cooler like an h100i if your case has room for it. If your case has room for it, for around the $55 range the thermalright true spirit 140 power has some pretty impressive results but it's quite tall at 170mm (vs other tower air coolers that typically stay around 160mm or less). Cooler height affects how far it sticks out and whether or not it will interfere with the side panel closing.
 
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x3zzi40z

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Nov 9, 2012
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Im not really looking to overclock at the minute, the stock speeds seem to do fine for the games i am playing.

I have just re ran prime95 using the version that you suggested and using the small fft's test, temperatures have dropped to around 70c at max now. Do these represent what i will be getting while gaming?
 
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synphul

synphul

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Mar 11, 2011
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Under gaming you should be seeing less than with prime95. The purpose of stress tests like prime95, occt, intel burn test etc is to really push the limits as a worst case scenario. Ideally normal max usage situations like games shouldn't be as stressful and will often times make for lower temps. 70c sounds more normal for stress testing, under gaming you'll probably hit no more than 60-65, possibly even in the high 50's even with the cpu at 100%. It would be interesting to see. If you have a program like hwmonitor or hwinfo64, try opening it up and get a feel for where your temps are at under stress (prime) and at idle. I know with hwinfo64 you can clear the values and let it begin working from a clean slate. Try gaming for 30min to an hour and check to see what the max temp reached is.
 
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x3zzi40z

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Nov 9, 2012
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I have hardware monitor downloaded and have been using it to monitor my temperatures throughout testing with prime95, temperatures stay around 30c on idle, rising to around 40c when simply browsing, rising to 60-70c (68c being highest registered) while playing H1Z1 for an hour or two.
 
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