ASRock Rack has created the first AM4 socket server boards, X470D4U, X470D4U2-2T

@RoLee What PSU/PSUs did you use when you were experiencing issues?

Maybe we are seeing something similar to 2013 Intel Hasswell situation here:

At that time many PSUs started appearing with ‘Haswell-ready’ sticker

Or it’s just what @Mastic_Warrior mentioned in this old thread: Ryzen C-State related problems -- what is the root cause?