So these are the video settings at max. I have a 7970 AMD and an i5 cpu.
Ignore the choppiness of the video. For some reason my normal video record program was having issue with 2k15 so I had to use a different one that I don't think is very good and it made the video quality very choppy. The game isn't choppy like the video.
Just keep your eye on the frame rate counter in the upper left. The only difference in the videos is that one is with v-sync on and the other with it off.
With V-sync off I get anywhere from 60 to 80 frames pretty much always during gameplay. The framerate drops into the 30 and 40's during cutscenes and during the opening tip-off but is always in the range mentioned above during actual gameplay.
Vsync-on seems to be a frame limiter that just locks it at 60. During gameplay it stays pegged at 60 with the same dip in frame with cutscenes and the opening tip.
I will say the game plays better, and feels smoother with v-sync on. It feels choppy and inconsistent with it off even though its always in the 60 to 80 range.
V-sync on
VIDEO V-sync off.
VIDEO