Side note: You can also just delete the mcupdate_GenuineIntel.dll from System 32. It doesn't need to be there. The system will run just fine with the BIOS microcode. Albeit without Spectre protections(if the microcode in the BIOS hasn't been updated with said protections).
Deleted it. Can confirm: overclocking works again.
System:
x99 gaming
i7 6800k @ 4.0ghz again (undervolted)
![Smile :) :)](https://tpucdn.com/forums/data/assets/smilies/smile-v1.gif)
Thank you very much