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Discussion Starter #1

I currently have a problem whereby no matter what I configured within my BIOS, I just am NOT able to get my processor to clock past 4.7GHz. I was hoping that someone here would be able to point me in the right direction on how to go about getting this corrected as I am well and truly stumped.

I have already chatted with a few individuals over on Reddit regarding this problem, but they've been unable to provide a working solution.
Original Help Request: https://www.reddit.com/r/overclocking/comments/8qbw2f/intel_i7_8700k_chip_wont_overclock_past_47ghz/

Intel i7 8700K
ASRock Z370 Pro4
Corsair Vengence DDR4 RAM

So far, I've attempted:
  • Overclocking to a stupidly high number (5.4) to prove a point that it wasn't just underclocking, it was limited. Didn't work.
  • Adjusted Voltage a lot varying from offsets of -60 to 120 and fixed from 1.2 to 1.4.
  • Setting AVX from 5 to 0 (auto).
  • Ensured that the settings are being saved between restarts.
  • Updated the BIOS
  • Messed with disabling EIST/SpeedShift/Turbo Boost

I run Ubuntu 16.04, but the BIOS itself doesn't show it going any higher either.
5.4 Target

4.7 Cap

The screenshot above shows the older version of bios, but it is the same even after updating. I'm aware that 4.7 is the turbo boost cap, so could it have something to do with that? Whenever I attempt to disable turbo boost, I can't set a multiplier. When I set a multiplier it just re-enables turbo boost. https://www.elhspowered.com/wphillips/fb035b75fb.mp4

Does anyone here have any possible idea on how to fix this?

Hardware Enthusiast
647 Posts
Overclocking with Linux is going to be trickier due to the lack of monitoring applications.

Turbostat is probably the only easy-to-use CPUz replacement for Linux right now.

Put the system under load, and see what frequency turbostat shows. The BIOS "EZ mode" is probably just showing the top stock turbo. It might not be showing what the real speed is.

The other possibility is that you're not even posting at 5.4 GHz. That's a bit on the high side. Try dropping down to 4.8 GHz all cores first. Make sure that you see 4.8 GHz inside the OS (via turbostat), then work your way up from there.

Not New to OCN
1,745 Posts
Based on silicon lottery, only the top 17% of 8700k's can hit 5.2GHz, much less than that hit 5.3, and even less than that is 5.4. So odds are, you won't even be able to. Either way, you need to take small steps, and at most start for a 5GHz target. Then see if you can work your way up after that.
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