8700k OC - what Prime95 small fft CPU temps to tolerate?

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itisisntit123

Feb 24, 2018
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Hi guys,

First PC build.

I've got an 8700k OC'd to 4.7ghz, be quiet! Dark Rock 3 cooler, Asus ROG STRIX Z370e, 16gb DDR4 2333mhz RAM, 250gb SSD, 2TB 7200rpm HD, and an EVGA GTX 1080 sc coming in the mail tomorrow (EXCITED!!!).

MCE off, vcore set in the bios as 1.235 (vdroop to 1.216 under load), LLC 6 due to crazy Vdroop issues. CPUz benchmark hits a high of 67C and XTU stress test hits a high of 65-68. Prime95 26.6 Small fft (non-ATX) will hit an average temp of anywhere between 83-85. CPU idles at 26-30.

To go to 4.8ghz stably with Prime95 small fft, I need a vcore of of 1.27-1.28, but temps for small fft will average 90-93. Obviously temps under other stress programs and Prime95 blender are more tolerable.

So my question is, considering the above information, do I:

A. stay at 4.7ghz with comfortable temps.

or

B. up to 4.8ghz and tolerate high small fft temps, which will probably never be emulated in anything else I do on this PC (gaming)?

Thanks for being patient with a newbie, folks!
 
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mdd1963

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Jan 14, 2006
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Unless you are playing on a 144 Hz monitor at 1080P, you are likely to be GPU-limited if/when playing most games anyway, where an extra 100-300 MHz on CPU clockspeed is of little consequence...

If your livelihood depends on time/results limited by your CPU, that's another story. But, an 8700K even at stock speeds (especially with MCE on) is unlikely to be dethroned anytime soon, and, it would probably be 3-5 years before anyone begins describing it as just 'adequate' for gaming.

Battlefield 1, for example, can only be rendered at 135-140 fps with today's GPUs at 1080P max, and, the 8700K achieves 2-3 fps over the 7700K, as we are GPU limited.
 
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I

itisisntit123

Feb 24, 2018
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Oh I'm not overclocking to gain any more performance. I know the difference between 4.7ghz and 5ghz is inconsequential. I just want to see how far I can push things safely.
 
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4Ryan6

4Ryan6

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Apr 14, 2002
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ROFL :lol:

Gaining performance is why I overclock and risk the CPU or GPU I invested my money in. There may not be much gain from overclocking when it comes to gaming that the games are GPU dependent, but there are other gains besides that. But games that are not GPU dependent Flight Simulator 10 show tremendous gains from overclocking the CPU, especially a 6 core CPU.

There's quite the significant difference between 4.7ghz and 5ghz on the 8700K especially if you can keep it cool enough that there's no performance loss from the CPU protecting itself.



 
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itisisntit123

Feb 24, 2018
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As per my intended use, it's inconsequential.

Look, with my current setup, a stable 83 degrees in small fft is what is holding me to 4.7ghz. You're the first person to recommend prioritizing overclock, so then you're at liberty of answering my original question.

Do you think pushing to 4.8ghz warrants tolerating small fft temperatures in the late 80s to early 90s with temps pretty much tolerable (to my threshold) in every other application or stress test I use?

I'm asking because I've searched around and observed two schools of thought on the matter:

A. prime fft stability is required, but recognize that temps may go to 90 on a non-delidded chip and as long as temps are fine everywhere else, go for it.

B. prime fft stability is required, but you should keep temps there reasonable for some headroom in future applications that might push the CPU.
 
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4Ryan6

4Ryan6

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Apr 14, 2002
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Regarding A and B, regular applications are not going to push temperatures anywhere near what stress testing does and you only run stress testing to discover a state of stability, so really you should use your most taxing applications and see where your temperatures are running?

Then decide what to do, I don't like my application temperatures anywhere near danger concerns they're mostly around 40c, and that's for a 5ghz OC of my 8700K.
 
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I

itisisntit123

Feb 24, 2018
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I tightened a screw on my CPU's backplate and decreased temperatures by about 5C. Small fft now averages a package temp of 77-78 with 4.7. Tested Destiny 2 maxed out + streaming to a friend with Twitch and temps stayed mid to high 60s on average. Idle temps are now like 23-25.

Unfortunately, an OC to 4.8ghz that doesn't freeze Intel XTU benchmark requires a 1.285 vCore which ups temps by about 10 degrees, and considering load temps right now, don't think I'm willing to go there.

I think I'll stick to 4.7ghz for now considering my setup and maybe look into building a custom loop in a few months (there's huge dead space in my case that'd be perfect for it). Maybe even a delid if I can withstand the pucker factor.

Thanks for your advice.



 
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