intel 13th gen

So I bought a 13th gen Intel CPU off ebay a few months ago. Now it started misbehaving - blue screens in a clean Windows install, restarts when running Cinebench (while temps stay under 90°C). The CPU hasn't been overclocked or overvolted, always had a 240mm water cooler on. Intel warranty says...

I upgraded to a 13700KF about a week ago and have been tweaking my overclock of it ever since. I got it stable at 5.5GHz all P-Cores with E-Cores disabled. I also overclocked my RAM from 3600MHz CL16 to 3900MHz CL17. This configuration was rock solid stable, passing hours of Cinebench...

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