Hi.
Have you found a solution the the issue?
I have just got 5600 xt. Have artifact issue where red or blue pixels move across screen fast from left to right. I have reinstalled windows, cleaned the driver using DDU and also AMD cleaning utility, tried two different AMD drivers for the card, still shows up. I'm running at 144hz, 2056x1440. Here's what happens on my screen:
Radeon 5600 xt Sapphire - YouTube
It is not the cable or monitor as I have swapped them (HDMI, DP) and the issue still shows on the other monitor with a different cable. It's either a driver issue or the GPU. If I've tried two different drivers.. I'm starting to think it is the GPU but the issue was not there for the first few hours of using the new computer.