There are two types of AA, the first one which I can't remember the name of, causes a massive performance hit, even on 2xAA, so I keep it off. Thankfully, post-AA removes the vast majority of jaggies and doesn't cost much in terms of performance. I run everything else on ultra apart from textures because I get some stuttering with ultra textures (probably because my card only has 1GB of memory). Average FPS is about 55, can go down to 45 in large outdoor areas but is always over 60 in the smaller maps and inside. GTX560Ti OCed to 980Mhz.