i took my card to 650/2100 and didnt see any artifacting in ATI Tool, but something must have been wrong, since i also took it to 700/2200 and no artifacting :S
Thanks for the link Timmy.. I tried the settings they had and it lowered preformance quite a bit so I lowered the overclock a little bit and it was better but still worse than stock. Bearing in mind this already runs at 580mhz - 850mhz as its the OC2 version.. Seems they could be the best settings for it :S