X800GTO2 Artifacting

[MDE]

I've got my new X800GTO2 running strong, except for a problem with artifacting in FEAR and one of the CPU tests in 3DMark05. FEAR is so bad it's almost unplayable, and the 3DM test only slightly artifacts. This happened with everything at stock settings (CPU and video card) and with upgraded cooling on the video card and Cat 5.12 and 5.13 beta drivers. World of Warcraft is fine and the ATI Tool artifact scanner runs for over an hour without a problem. Could it be drivers or should I just RMA?