In fullscreen mode, the frame rate is kept in sync with your monitor's refresh rate. This is usually 60. If it can't manage 60, it jumps to an integer division of the refresh rate (60/2 = 30, 60/3 = 20, and so on).
No. Only the MAXIMUM framerate cannot be higher than the monitor's refresh rate.
But you can lock the framerate of your game at any fps value between 1 and 60!
In my game I have locked the framerate at 50 fps (fps_min = 49; fps_max = 50;).
So I always have a framerate of 50 fps in fullscreen mode.
When I lock the framerate at 70 fps, and my monitor can only manage 60 fps, then the framerate of my game is reduzed to 60 fps.
