I can't get this card to effectively mine. Replaced a 5830, which mined happily 24/7, with a 7970, and now there are constantly artifacts/glitches in the display and eventual crash after a couple hours of mining in cgminer.

I've tried mining at stock speeds, underclocked, overclocked, even setting the temperature ceiling very low.

Catalyst 13.1 with its version of APP SDK.

Is this a known issue? Any help is appreciated.