OK just booted up Crysis 3 with max settings and TXAA High, 15 fps at 1440p on 680 SLI. Dropped AA down to SMAA and got 30 fps. AA off and got 45 fps. This is all on the first level. It uses 99% of both my cards. I put shading, shadows and particles down from very high to high and now I get 60 fps. This game is a beast.