A driver bug for GCN cards ?
Can someone, besides me, with a HD 5000 or HD 6000 series confirm or deny this issue ?
Can you test other games, ideally dx9, and see if you get any artifacts ?
State of decay is already confirmed to have the exact issue with, presumably, Graphic Core Next GPUs.
Check your gpu temps in-game as well, just to be sure, regardless if another driver does not show this.
gigabyte X58A-UD3R rev.2, core i7 975 3.9ghz (stock voltage), windows 8.1 64-bit, corsair 12gb DDR3 1600mhz 7-7-7-20 RAM, xfx HD 5970 + gigabyte HD 5970 (950mhz/ 1100mhz), coolermaster ultimate 900w PSU.
amd catalyst 14.12 Omega Driver