Benchmarks: MSAAx8, Physx Off
After ditching FXAA for the better looking and far more demanding MSAAx8, performance fell across the board with the GTX 660 averaging 54fps (from 102fps with FXAA), for example. To exceed 60fps with MSAAx8 at this resolution, you'll need at least the R9 270X, HD 7950 or GTX 760.
Jumping up to 1920x1200 requires the GTX 760, GTX 670 or HD 7950 Boost for 60fps, though the vanilla GTX 660 delivered a very playable 45fps and the HD 7870 was even faster at 47fps.
Increasing the resolution to 2560x1600 reduced the mighty R9 290X to 60fps, which was still 2fps faster than the GTX Titan, interestingly. Similarly, the HD 7970 GHz Edition was 6fps faster than the GTX 680 and 3fps faster than the GTX 770.