specs: 3570k@4.6, 8gb ram, Titan X SC, installed on ssd, running windows 7
2160p was not really feasible with maxed out settings (except aa and sharpness filter), even with 30 fps cap. Frequent dips down to 20-25, especially when zoomed in on hair. It may be possible to do better without hairworks, but I did not try that.
1080p with maxed out settings (now with aa and sharpness filter) seemed to mostly hold 60 fps, but with semi-frequent dips down to 57-59 and less frequent dips down to 50 or so. Sadly, the game crashed after the first post-tutorial battle, so now I am back on gaf instead of playing the game ...