i5 4670k Temp Questions and Potential of OC

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Buffalufacus

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So I have been sitting on my 4670k stock for awhile now (3.4GHz/1.2v). I installed a Corsair H100i and finally have time to tinker and begin the OC process with this CPU. Before I start I wanted to make sure that my temps are ok, because they seem generally high. My idle temps at desktop are around 40c. While playing games (SWTOR, Wildstar) I seem to be around 55% load and ~55C. I tried a basic Prime95 test and under 100% load I was hitting high 90's and even touched 100C. Granted I only ran the test for about 10 minutes, the temps seemed too high for me to want to run it longer. Right now I have a Corsair 500r case with two front intake fans, 1 back exhaust, 2 top exhaust on my H100i, one Side 200mm intake fan, power supply faced down, and two R9 280x cards in crossfire.

So again, before I OC are these normal, safe temps? or should I consider doing a clean of my system, a reapply of thermal paste and retest? I'm really new to overclocking so maybe this is may be a dumb question.
 
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menetlaus

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Something is wrong with those temps.

Stock clocks you shouldn't be hitting above 70C (best guess) with that cooler.

Could be your monitoring software is giving bad results and it could be poor thermal connection between CPU and H100i
 
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Buffalufacus

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I was using corsair link, cupid hwmonitor and RealTemp and they all showed the same temps. So my guess would be the included thermal paste was bad or I just failed at installing it. Any recommendations on thermal paste ?
 
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menetlaus

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Recommendations - If you think there isn't enough thermal compound on the CPU before installing the waterblock - then you have too much there. If the fit is good between the CPU and waterblock it really doesn't take much.

There are lots of reviews and guides available for thermal compound.

I'd recommend you stay away from the ceramic stuff. Arctic MX-2 through MX-5 or arctic silver 5 are couple ones that stick out in my head as decent performance/$ and not too bad for a novice.


 
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Buffalufacus

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I think I might just order some Arctic MX-4 and clean/reapply the thermal paste to the CPU/H100i and see if there's any difference under 100% load. Right now with my case open i'm idle at 32C, but even wide open my 100% was in the high 90's. I guess this is a wait and see game now.
 
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Buffalufacus

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Ok So I redid the Thermal Paste, and ran a 10 minute test on LinX and my peak temp was 78C, idle temps around the 30's. All in all much better. On Prime 95 blend test, I was going in the low 60's for 100% load. The prime95 Small FFT test I was maxing around 87C. Obviously these numbers are better than before. As I pulled off the H100i i noticed that the center didn't have any contact with the thermal paste, which was why my numbers were so high. Now my coverage should be better. The real question is, again, what's my potential to OC with these temperatures. I'm sure I can do a bit, but will I be able to handle a big push with these temperature improvements on stock? Should I try to OC and if it gets too crazy, do another thermal application? or just stop asking questions and see what happens?
 
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Buffalufacus

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After reading some i5 4670k OC results and guides I went for broke and tried to find how good my chip is. Went for 4.6GHz/1.25V and it made it to the desktop then BSOD. Dialed it back down to 4.3GHz/1.2V and it made it through a LinX test with max temp 83C, which seems pretty good. Prime95 Blend test took it to 87C a few times, Small FFT test hit 91C . I think that's about my limit for OCing unless I do something about the heat. I see people getting "60-70C" in Prime95 which means I'm clearly doing something wrong here.
 
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