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the memory clock isnt overclocked by any chance? my 8800gt has a 900mhz memory clock speed, a single amount of mhz over caused the artifacts for me, aswell as the fans needed turning up
I'm having the same issues with the graphics on my GTX 295.
No overclocking and temps are all good.
I'm also having other issues with the game that lead me to believe this is the games fault, or a driver fault.
Falling through buildings and dying for no apparent reasons at times also.