Good temp for i7 8700k 5GHz overclock?

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willo101

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Feb 11, 2018
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Hi, I built a new rig and tried overclocking for the first time. I overclocked my new I7 8700k to 5GHz. At full load on Prime95 it hit 79 degrees for a second and stayed at around 77 degrees most of the time. Never over 79 degrees. Is this normal temperature?
My Vcore is at 1.3v. Computer is:

I7 8700k
Evga CLC 280 liquid cooler
Gigabyte Z370 Auros Gaming 7
Evga GTX 1080 SC
Evga 850BQ Bronze 80 Plus
 
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Karadjgne
Depends on your settings and which Prime95 you used. For p95 26.6 or prior, it doesn't use AVX instructions, so on small fft gives a clean 100% load. 77°C in that case would be great. However, after 26.6 p95 does use AVX. This is where problems start. If you haven't done it yet, look for the AVX offset in bios. Make sure it's set for at least 2. That's 200MHz. What'll happen is when the cpu uses AVX, it'll downgrade the OC accordingly, so at 2 your OC on p95 28.6 would read 4.8GHz at 1.3v instead.
If you used blend or large fft, that'll use your ram as well as the cpu, so expect as little as 80% loads, so the 77°C at 4.8GHz 1.3v isn't as good.
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Karadjgne

Karadjgne

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Depends on your settings and which Prime95 you used. For p95 26.6 or prior, it doesn't use AVX instructions, so on small fft gives a clean 100% load. 77°C in that case would be great. However, after 26.6 p95 does use AVX. This is where problems start. If you haven't done it yet, look for the AVX offset in bios. Make sure it's set for at least 2. That's 200MHz. What'll happen is when the cpu uses AVX, it'll downgrade the OC accordingly, so at 2 your OC on p95 28.6 would read 4.8GHz at 1.3v instead.
If you used blend or large fft, that'll use your ram as well as the cpu, so expect as little as 80% loads, so the 77°C at 4.8GHz 1.3v isn't as good.
 
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urbancamper

urbancamper

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Apr 10, 2011
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It is an excellent overclock. It is highly unlikely that any app you use that needs avx instructions is going to stress your system to 100% load. Therefore the temps will not get outrageously high. Just leave it the way it is. Again, an excellent overclock congrats on getting a good cpu.

 
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Maxsupertweaker

Maxsupertweaker

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May 29, 2014
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That AIO is working beautifully for you. My Noctua D15 allows for 5GHz but during gaming the temps do spike into the 80's. That's not too hot but I like to see the CPU Package fluctuate between 55 and 75 during gaming and 30 to 45 when idle.

Just remember to backup your OC Profile from BIOS to a USB2.0 Flash Drive.
 
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