I have the "problem", that my first CPU Core is always at 67% - 90% usage at idle. The other Cores are around 3% - 15%.
In Games I also have little micro stutters. Only thing I did, was setting the Core Clock to 3.7Ghz in the Bios, but even without this happens.
I dont't know if I did anything wrong, but my PC was running since 1,5 Years without a Problem.
Thanks for every tip/ help.