One setting that finally made a significant and consistently reproducible difference in the presence of artifacts is simply turning on VSync through the Catalyst Control Center. With VSync on, even when running 3DMark Fire Strike at Extreme settings, I get minimal visual artifacts.
I'm interested in hearing whether other people with R9 graphics cards get similar results.
Edit: Scratch that. After using the video card for long enough with vSync on, artifacts eventually appeared and with the same severity as before. I tried two more driver versions today with the exact same results.
I've given up and decided to send it back. This will be my first ever RMA with Newegg.
08:27 PM by