I have run nothing but NVida cards and not had any issues at all with them. I have used the 5200, 5500 and now the 6200 OC 256MB. These cards have performed well for me. I have not gone much higher in the cards because it requires a larger power supply and I'm not willing to part with my money for that card/power supply combo. I will when absolutely necessary.
Everyone should check their virtual memory. SH3 is a memory hog and does not hesitate to start swapping between the hard drive. I do not care what video card you have...if the game is swapping and looking for memory off the hard driver, your game will not run well
