I am gaming at 2560x1440 using 2xSLI Titans and I have to have SSAA at 2x in order to have solid 60fps. Every other option I have set to the highest possible setting. SSAA at 3x gives me around 45fps on average, 4xSSAA gives me mid 30's in FPS. For a solid 60fps, I need to use 2xSSAA. In a few cut scenes it dropped to the low 50's, but outside that it has been solid. I did get some weird flickering with a shadow when you get off of that circular elevator thing, but outside of that it has been pretty solid.
Hard to believe that in order to max out this game with EVERYTHING set to max at 1440p it seems like you would need 3 Titans. That or await for driver maturity to get better performance.