As expected the 10900X CPUs are the most trash bins from intel that could barely be sold as working. My sample can not get 5GHz stable at all. No chance.
Best I can run is CB15, CB20 still crashes instantly.
Two of the cores came with a VID of 1.375V for the 4.6GHz boost clocks... Even going above 1.4V can't help that. They might work at ~1.43V when the temps were lower, but at that point I also run into temperature induced instability.
Funny how much difference there is in the 14nm yields. The new 10900K reaching up to 5.5GHz on ambient cooling no problem, and the 10900X who struggle to even see 5GHz.