Today I disconnected all the all my HDDs and SSDs but one, and installed Win10 on it, leaving all my BIOS settings default.
Then I proceeded to install the chipset driver as well as the graphics driver. No Ryzen Master, HWMonitor etc.
Everything seemed fine so far. Ran Realbench for half an hour -> fine.
Then I opened op Firefox again to check something and there it was again. Mouse started stuttering and half a second later I got a black screen. Stangely enough the displays came back on, a second later but that's it for me.
If the sys won't even work on a fresh windows install @stock clocks etc. I am not sure I want to take the time and further research what might be the problem here.
Also this is the second to last day that I can send my system back to Amazon, whch I will do later.
Anyway thanks for the help guys. Hope you won't run into any further problems with your rigs.
yeah, probably best to return while you can.
While I experienced a lot of black screen issues, for different reasons, none of them were under light load at stock.
My single biggest culprit for the recoverable screen blackouts was SOCvoltage. If that wasn't the case for you, probably best saving yourself the frustration.