New Kaby Lake CPU running hot

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Felix_Sonderkammer

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Jun 7, 2017
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I just built a new PC with an i5-7600K CPU, and my core temperatures when running the small FFT test are Prime 95 is 68-71 C. These temperatures seem high to me when I have an aftermarket cooler and four case fans (see below). Turboboost is activated, and the CPU clock is at 4.2 GHz. I was planning on overclocking, but I currently have very little headroom to do that. Ambient temperature is 25 C. Idle temperature is in the high 30s C.

I have reapplied the thermal paste twice (one drop in the middle a few millimeters long, let the heatsink do the spreading) and haven't gotten better temperatures.

Are these temperatures a problem? The temperatures would be even higher if I didn't have a huge heatsink and four case fans. Did I just have bad luck in the silicon lottery?

Cooler: Noctua NH-U14S
Thermal paste: Noctua NT-H1
Motherboard: MSI Gaming M3
RAM: 2x8GB DDR4-3200 MHz Ripjaws G.Skill
Power supply: Seasonic Prime Titanium 650W
Case: Fractal Design Define R5
Case fans: 4x140mm (3 intake, 1 exhaust)
 
Solution
Pauuuuulix
Quoting user CompuTronix:
Do NOT run any versions of Prime95 later than 26.6. Here's why:

Core i 2nd, 3rd, 4th, 5th and 6th Generation CPU's have AVX (Advanced Vector Extension) instruction sets. Recent versions of Prime95, such as 28.5, run AVX code on the Floating Point Unit (FPU) math coprocessor, which produces unrealistically high temperatures. The FPU test in the utility AIDA64 shows similar results.

Source: http://www.tomshardware.co.uk/answers/id-2772371/4690-stock-cooler-degrees-celsius-prime95.html
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Felix_Sonderkammer

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Jun 7, 2017
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I downloaded it and ran the CPU benchmarks. They didn't take very long to do, and my temperatures didn't seem to get above the fifties C.

Thanks for letting me know that recent versions of Prime 95 result in unusually high temperatures. When I run SETI@Home, my temperatures have been much lower (55-63 C).
 
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Pauuuuulix

Pauuuuulix

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Jun 19, 2014
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Quoting user CompuTronix:
Do NOT run any versions of Prime95 later than 26.6. Here's why:

Core i 2nd, 3rd, 4th, 5th and 6th Generation CPU's have AVX (Advanced Vector Extension) instruction sets. Recent versions of Prime95, such as 28.5, run AVX code on the Floating Point Unit (FPU) math coprocessor, which produces unrealistically high temperatures. The FPU test in the utility AIDA64 shows similar results.

Source: http://www.tomshardware.co.uk/answers/id-2772371/4690-stock-cooler-degrees-celsius-prime95.html
 
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