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Windows won't boot after OC>4900 mhz

I recently got a new rig with a z170a, i56600k, and and h100i.

I slowly went up with the OC and found that I had a stable 4900mhz oc with a max temp of 62 celcius. Once I got to 5000 mhz Windows just wouldn't boot. To clarify, I was able to go through the BIOS.

The first error was inaccessible boot device (intel pro 2500 180 gb ssd) and thereafter, windows simply gave messages saying "your pc needs to restart".

Any ideas?
3 answers Last reply Best Answer
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  1. Your overclock isn't stable, either up the voltage (if it's not too high, maybe 1.35 or so max), while keeping an eye on temps, or reduce overclock. 4.9 GHz is really good anyway.
  2. TJ Hooker said:
    Your overclock isn't stable, either up the voltage (if it's not too high, maybe 1.35 or so max), while keeping an eye on temps, or reduce overclock. 4.9 GHz is really good anyway.


    I skeptically bumped it up to 1.264V and it still doesn't work.
    However, the error code I got was CRITICAL_PROCESS_DIED.

    Does your advice remain the same?
  3. Best answer
    I'm not sure what that error means. When I was trying to overclock my skylake chip, I got a variety of error codes when things were unstable.

    From what I've read about skylake overclocking, people are going all the way to 1.35-1.4 V and beyond. I'd say try 1.3 V, again, keeping a close eye on temps.

    You've likely hit the point of diminishing returns, where frequency increases require exponentially more voltage. Honestly, 4.9 GHz at 1.264 V (or less, if you had it lower before) is already a fantastic result, both in terms of max frequency and required voltage. Even if you can't get it any higher, I'd still be very happy with it.
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