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I'm fully expecting it not be fixed in the next drivers too.
Have a gigabyte 280x and getting the same problems. Mines a factory overxlocked version running at 1500/1100 tried reducing them to 1400/1000 but still getting them on occasion. When running at the stock (for the card) freuqnecys was getting a lot of driver crashes. Recon it's worth RMA'ing or is this driver issue as well, as tried most drivers from the CD ones to the 15.4betas. Gettingnthe artifacting on GTA V particularly random squares appearing around the edges of stuff.
Don't RMA it. It's definitely not a hardware issue.