So I'm fixing up a mates pc, just put a new GPU in, Rx 570, seems ok for the first couple of startups. Then I notice what looks to be artifacts on the screen. So I try a few things, different drivers, even DDU the old ones, removed Nvidia drivers. When no drivers I can't see any artifacts, as soon as drivers installed, bang they back. I tried most recent drivers, mid Oct and a older maybe may one. ' Psu is a new corsair 750. I ran F@H for about a hour, as a stress check, temps were low 70's. Any suggestions? Is the card stuffed?