for those of you saying vsync can display fractional FPS under 60fps, It absolutely postivively cannot.
In order to maintain sync with the monitor it MUST drop to 30fps (the next lowest frame rate thats an even quotient of 60). It basically displays the same frame twice.
DYNAMIC VSYNC is the only form of vsync that can. This turns off vsync if it cannot maintain 60fps.
AMD does not support d-vsync (without radeon pro), so that out of the equation.