The Witcher 3 graphical glitches
The Witcher 3 graphical glitches
Maybe adjust the settings further—cut power targets down to 100, try to avoid overclocking if you can. If the artifacts disappear, that’s likely the problem. If they remain, reset everything and confirm the changes.
In the Witcher 3 only, a bad GPU would affect all games wouldn't it? Consider another demanding visual project and boost the settings. If you don’t see any issues at all, it might be the game itself creating the artifacts? Do you own any DLC? Check if the artifacts appear in Blood and Wine. If they do, try another major title.