I managed to OC the memory clock on my GTS 250 a bit and play Crysis: Warhead without any issues. I increased the core clock and shader clock and played and everything was fine, but when I increased the quality to Gamer, four square-ish spots on the left side of the screen popped up and were flashing different colors, like christmas lights. Is this an artifact caused by the memory OC? The game also crashed when I switched back to Mainstream with AA set to x4. Thanks for answering.