i5-4690K hitting 100c in Prime95

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drambit

drambit

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Sep 23, 2011
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I don't think my story as any different than anyone elses so I will just include as much information as possible.

MoBo: MSI z97s-SLI
CPU: i5-4790K
Heatsink: Hyper 212 EVO with AS5 paste applied with a pea sized glob pressed with the heatsink.

Ambient Temp: ~23C
Core Speed: 4.4GHZ
VCore: 1.250 volts
Memory speed: 1600hz
(Other settings are basically the same as the popular "Quick and Dirty 4.4ghz 4690K" guide.)

With all of the above I typically get about 80-90c in Prime95 (according to HWmonitor,) at certain points it goes to 100C though, and stays there until I stop the software. All 4 cores float around 40C on idle.

Obviously this temperature is obnoxiously high and I need to change something no matter what, but what is likely the cause here?

I've heard about a ton of potential variables, such as bad luck with the chip performance, bad TIM application, bad heatsink mounting, bad case cooling, bad settings, and simply the fact that haswell tends to run hot. I think out of all of those the most likely things that are going wrong are that it is a chip that is not performing well, my settings are not quite right, or the thermal paste isn't right, but I'm not sure how to rule things out in order to start optimizing my setup.

Thanks in advance for any help.

 
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uthvag

uthvag

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Oct 5, 2014
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although it is a bit high

90C is acceptable while on prime95 and is actually a bit decent wile on an OC

they are called stress tests for a reason

for a more realistic test , try running games / using uniengine heaven
 
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I

i7Baby

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"Obviously this temperature is obnoxiously high and I need to change something no matter what, but what is likely the cause here?"

The temp is high because you're using Prime 95. It's too stressful. The most you should use is Prime 95 v 26.6. It shouldn't get over 80C
 
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drambit

drambit

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Sep 23, 2011
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It can't be too stressful, that's not how it works as far as I know. Prime95 puts your CPU to the absolute limit, and the absolute limit is supposed to be far, far lower than 100C. Doesn't really matter if in games I never see that temp. How does changing the version change stress anyway?
 
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drambit

drambit

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Sep 23, 2011
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Oh wow I wasn't expecting the difference between software versions to be anywhere near that significant. I went from hitting 100s for long periods of time to averaging about 80c across all cores. Knowing that this 80c is only in the most extreme of circumstances actually is pretty damn good IMO, way cooler than I was expecting coming from 100.

Another question though, my idle temps hover just around 40C, which although is okay and doesn't really cause any problems, IMO it is a bit high (I heard it is supposed to be in the lower have of 30C on idle.) Is there anything I can do to lower that without having to be super picky about the way the thermal paste is spread or minute details like that? I am happy with my 100% load temps just not really satisfied with my idle temps. Of course idle temps don't really matter though.
 
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RunLuke

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Dec 8, 2014
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How well is your case cooled? Supposedly the heat sink on the 4790K (that I have) is better than yours - AFAIK.

These are my temps with 2 x 140mm and 2 x 120mm fans fans and an h100i

Capture4.PNG
 
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drambit

drambit

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Sep 23, 2011
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Water cooling is generally better than even the best of air cooling, and I don't even have high end air cooling so it is no shock that you have much better temps with that (as far as I know.) My case cooling isn't all that great, it's one stock 120mm intake, one stock 120mm exhaust, one 120mm on my H212, and the two smaller fans that are on the heatsink of my GPU. My case (Corsair 200R) has spots for two 200mm fans on the top and two 120s on the side, but all four of those spots are empty. That could very well be the reason for high idle temps, but I don't think most people have insane case cooling.
 
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drambit

drambit

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Sep 23, 2011
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That logic is silly dude. First of all; I'm not complaining that 40c is insanely high or anything, I am just not very satisfied with the idle temps because typically they are about 7c lower, which ties nicely into my second point which is that the reason I know my temps are slightly unusually high is because plenty of people with the same heatsink and CPU as me usually have lower temps. It isn't the coolers fault, probably just a large number of very small factors that vary a lot.

 
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