If it's happening as frequently as you demonstrate, there doesn't seem to be much left in the card. Did you try reducing memory clocks to see if it reduces the instances or characteristics of the artifacting? Other option would be to dial up the VRAM voltage a tiny bit (FE 6GB seems to be capable of VRAM overvolting, dunno about 3GB).
Are you still on 432.00 drivers as the screenshot shows? Might be kinda far-fetched, but can you see if the newer 44x.xx drivers do anything? My new 2060 Super was artifacting randomly like a mofo on MW and Chrome, when running anything earlier than 441.12, which has since solved the problem. Mine was also limited to the space inside the window of a program, as opposed to over the entire screen, as we're used to seeing when VRAM shits the bed. As in, an unplayably bright skybox and faraway buildings looking like stained glass in MW, as well as uniform black and white checkerboarding limited to the bounds of the Chrome window.