While more NVidia users seem to have fewer problems, not all NVidia users are problem-free. I run a GT 555M, and using the latest drivers or the newer beta drivers I still get FPS lag. I can have FPS as high as 110-120 on the fleet, and then if I move around it sits in the 50-60 range. As soon as I hit a cluster of people, or pass people sitting on their bikes who "pop" into view, my FPS drops to the 10s and sometimes single digits for a second or two. Same thing happens in warzones where the FPS just yoyos up and down. Just questing, I am usually in the 50-60 range.