на всякий случай оставлю тут инфу, в дополнение к отзыву, который оставлял человек
Проблема судя по всему не в asrock или msi, проблема в дефектных процах
https://community.amd.com/t5/pc-processors/8600g-flickering-dots/ ... light/true
конкретно вот этот отзыв
I ended up "solving" it by replacing the 8600G with a new one.
It's now 1 week later (I waited to see if any other problems would pop up), but the moment I installed the new one, the result was instant: all artifacts gone. I tested different RAM speeds, monitors, and refresh rates on both Windows and Linux. No artifacts whatsoever, no matter what combination I throw at it; currently running XMP DDR5-6000 at 75 Hz.
Seeing how weeks of troubleshooting went nowhere, but swapping the CPU instantly solved it, I can only assume my original CPU was defective in some way, perhaps a faulty iGPU. To reiterate, it was artifacting at all speeds, including DDR5-4800 (albeit extremely rarely and hard to notice) and DDR5-5200, which is within specification.
т.е. человек заменил проц и все заработало, так что в производителю мат. плат вряд ли относится
И да, если на 5200 работает - случай не будет гарантийным, т.к. официально 5200 по памяти для него макс. штатный режим работы.