Playing @ 5160x2560 (bezel corrected 3x Dell U3011) with everything on "Very High" except Shadows ("High") and using 16xAF, SMAA Low (1x).
On average, I get ~ 45FPS.
There is some perceptible stutter due to some of the settings that are CPU intensive/unoptimized.
Running it on an OC'd i7 3970X @ 4.5Ghz.
Video: http://youtu.be/NnH4njOVDDc
Let me know what you guys think!