Originally Posted by The Mac
for the last time, its not bloody vsync.
vsync doesnt do that.
Basically, Vsync matches up frames to your refresh rate. In your case, your monitor can show only 60FPS, so that is all you will ever get. It doesn't matter if your card can do 1 million FPS, you'll only ever see 60. Keeping Vsync on will produce the smoothest gameplay in this case.
However lets say you're getting 43 FPS in a game and you have Vsync on. This can cause the game to look less smooth because of the way frames are rendered with Vsync.
Simple solution: Getting over 60 FPS on your monitor? Keep Vsync on. Getting less than 60 FPS? Turn Vsync off. The GPU actually even comes with something called adaptive Vsync which does this automatically, on the fly, for the smoothest framerates possible.