I was wondering.. If V-sync is on is there an increase in performance since the fps is capped or is it unnoticeable?
Also, that depends on your definition of performance.
For me with V-sync OFF in the NVIDIA Control Panel, I scored 10,600 in the benchmark with avg 95 FPS.
With v-sync ON, I scored 7,400 with an avg FPS of 60. However, it appeared to me as the user to be MUCH MUCH smoother and fluid.
So with vsync on you will score lower in the benchmark, but may have a better user experience.