High Quality Performance
Ramping up to high quality, the GTX 680 landed square on the 60fps mark when testing at 1680x1050, while the GTX 670 followed with 55fps and the HD 7970 GHz edition was forced into the 4xfps territory with the GTX 660 Ti. It seems like the non-Ti GTX 660 or the HD 7950 are about as low as you'll want to go, as both were near the 40fps mark with the Nvidia card on top by 3fps.
At 1920x1200, Crysis 3 kicked the GTX 680 10fps below our ideal and the GTX 670 joined AMD's flagship in the 40fps range -- albeit with a 5fps lead. The HD 7970 GHz Edition averaged 41fps, narrowly beating the GTX 660 Ti by a single frame.
Crysis 3 is barely playable when running on high at 2560x1600, with the GTX 680 and HD 7970 GHz Edition barely offering 30fps. If you want play with these settings on a single-GPU card, you'll likely need Nvidia's new GTX Titan.