Possibly defective CPU?

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Yuksek

Yuksek

Honorable
Mar 3, 2013
18
0
10,520
Hi all,

I got an i7-6700k as well as all new parts for a new PC.
I am using the H115i cooler.

I have had issues with heat ever since I built this PC. On prime95, I was getting temps of 75C relatively quick and rising. This is with stock clocks, 75F room temp, and a good air-flow case (H440). Gaming, temps are going around 65-70C after a while, but start around 50C

I am on my 2nd H115i since I thought I had a faulty cooler.

Also I have tried reseating and reapplying thermal paste on the 1st cooler a few times with same results. The thermal paste was spread out thin and evenly.

At this point I can't even overclock because temps will be too high. And with this cooler, my temps should be much lower.

Could the CPU be reading too high temps? The cooler does not feel to be as hot as the CPU reads.

Any thoughts? TIA

PS. Package temp is higher than core temps ALWAYS.
 
Solution
Ecky
For what it's worth, recent Intel CPUs can safely run at much higher "reported" temperatures than older ones. They don't throttle until 100c, and laptop versions (same physical chip) typically run at 80-90c for years without problem.

Be aware that you can't compare the temperatures on two different CPUs. An i7 6700K's temperature sensor is much closer to the hottest parts of the CPU than on older LGA775 CPUs or AMD FX CPUs, so "80c" on your i7 may well be cooler than "55c" on an FX. All you can tell is that at 75c, you're still 25c away from throttling, and 55c away from shutdown temperatures.
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RoyalRope

Reputable
Aug 22, 2014
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4,560
Skylake runs hot. Those are beastly processors. I've seen several people with temps in high 80's. I think those temps are completely normal for that cpu and you can run hotter still. I wouldn't go much over 85 though.
 
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Ecky

Ecky

Illustrious
Feb 3, 2013
7,592
2
38,960
Temperatures sound within reason, and 75c is perfectly safe and normal for that CPU under stress testing. How warm does it get under non-AVX loads, and typical desktop usage? Unless you plan to run Prime95 every day, I wouldn't worry much about temps when running Prime95.

You would probably have been better served with a high-end air cooler; performance tends to be better than AiO watercoolers:

http://www.relaxedtech.com/reviews/noctua/nh-d15-versus-closed-loop-liquid-coolers/2
 
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Yuksek

Yuksek

Honorable
Mar 3, 2013
18
0
10,520


I have had great results with previous liquid coolers, which is why it is a bit of a shock for me now.

I get fine idle temps core temps around 18-21C and package temp around 24-26C.
Light usage (chrome, opening stuff etc) can reach around 50C but normally around 45C. I would say. Gaming is around 65C.

I used 2 version of prime95. Newer one spikes it to 62C instantly, steadily going up to 80+. Older one spikes to 55C and goes up to 70s.

I have seen this CPU normally run around 55-60C stock under full load, not 80C+

I also now just noticed that Corsair link says Im running 2.9K RPM for the pump, but BIOS and CPUFAN in HWMonitor show 1.4K. BIOS is set for full speed, maybe an issue?
 
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Ecky

Ecky

Illustrious
Feb 3, 2013
7,592
2
38,960
For what it's worth, recent Intel CPUs can safely run at much higher "reported" temperatures than older ones. They don't throttle until 100c, and laptop versions (same physical chip) typically run at 80-90c for years without problem.

Be aware that you can't compare the temperatures on two different CPUs. An i7 6700K's temperature sensor is much closer to the hottest parts of the CPU than on older LGA775 CPUs or AMD FX CPUs, so "80c" on your i7 may well be cooler than "55c" on an FX. All you can tell is that at 75c, you're still 25c away from throttling, and 55c away from shutdown temperatures.
 
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