i7 8700K high voltage/temps

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ProudXPhil

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Sep 8, 2016
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Hi,

I've installed my new 8700K in my Asrock Z370 Professional i7 and I really like the new system so far. Since the performance is enough for me at the moment, I decided not to overclock for now. However, I noticed one problem.

The CPU is cooled by a Noctua NH-D15 and runs at around 33 to 45°C (stock, idle). In my opinion that's already pretty hot considering that's idle. Sometimes there are 50°C peaks on some cores. As soon as I looked it up in HW monitor I realised that the Vcore went up. The first 15 minutes of doing Windows settings stuff it didn't exceed around 0.8V but right now it's CONSTANTLY around 1.2V (lowest 1.17V) while I'm only downloading a game from Origin.

Now I looked up the speed and it's running at 4.3 GHz - the all core turbo of the 8700K as far as I know. I'm wondering why it boosts like that while there's just around 8% CPU usage (download, Firefox tab). The Windows power plan is set to Balanced, so I doubt it's that what makes it Speed up like that. I couldn't figure out any way to make it clock down automatically. SpeedStep is enabled, so that's no problem as well.
 
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Supernova1138
Owning an 8700k myself, that does seem to be standard behaviour, the chip is fairly aggressive at running TurboBoost even on lighter tasks. Whether that's down to ASUS and ASRock running similar BIOSes or it's just a property of the chip and it's higher TDP giving more leeway for TurboBoost I don't know. It's not really harming the chip running it that way, but I guess you could try running with a Windows power plan that leans more towards power savings when you're not running heavier tasks if you want it to run cooler and at lower clocks.
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Supernova1138

Supernova1138

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Mar 22, 2011
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Owning an 8700k myself, that does seem to be standard behaviour, the chip is fairly aggressive at running TurboBoost even on lighter tasks. Whether that's down to ASUS and ASRock running similar BIOSes or it's just a property of the chip and it's higher TDP giving more leeway for TurboBoost I don't know. It's not really harming the chip running it that way, but I guess you could try running with a Windows power plan that leans more towards power savings when you're not running heavier tasks if you want it to run cooler and at lower clocks.
 
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ProudXPhil

Commendable
Sep 8, 2016
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@Supernova1138 Thanks for your answer. I'm sorry that I gotta ask you one more question, I hope it's ok for you. I've just customized the fan speeds in BIOS and while reading the different tabs, I noticed a really wired thing: The CPU cache speed is running at 4.4 GHz AT STOCK while the normal Speed is still 3.7 GHz. I loaded UEFI defaults and even flashed it and it's always the same "CPU/Cache 3700 GHz / 4400 GHz" which wired af in my opinion, since the cache is actually supposed to run at the same or a lower speed as far as I know.
 
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Supernova1138

Supernova1138

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Mar 22, 2011
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Yeah, cache ratio is at 44 on mine too and I'm running stock settings. If I were to guess, it's set that high by default because the CPU is going to run TurboBoost values that are similar or higher most of the time. The 3.7GHz base clock really seems like something that would only kick in when temps get really high, or if you were running the chip on a really low end motherboard and it got power restricted. That's the thing with Coffee Lake, the base clocks are practically meaningless because the all core Turbos are so much higher than the base clock and only seem to apply if your chip runs very hot or if you have power restrictions preventing it from running at the Turbo speeds.
 
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ProudXPhil

Commendable
Sep 8, 2016
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Oh right, I think I'm finally starting to get it. Since the motherboard reads out the stock values, the combination of 3.7 and 4.4 seems wired, because it's actually running much higher CPU speeds as well. Also noticed in Windows that it likes to boost pretty quick.

I forgot to say that I also think, the boards are quite similar. A few weeks ago I found out that Asrock was actually founded by Asus, crazy I didn't know that for a long time.
 
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