vsync won't help at all. all it does is lower your FPS. say your monitor is 60Hz, that means it can only show a max of 60FPS. if your GPU is outputting more than 60FPS, if look look left and right you will notice vertical tearing. ( http://www.nhancer.com/help/images/VSync.png
) the top half of your monitor will be ahead of the bottom half of your monitor. the top half is a frame ahead of the bottom half. to fix this problem with people who have high end cards and get over 60FPS in games, they enable Vsync which makes it so your GPU doesn't output more than your monitors refresh rate so there is no vertical tearing. if you get under 60, it goes directly down to 30. so if you were getting 50FPS, vsync will only allow you to have 30.
Nvidia made this new technology called adaptive vsync. this means that when you fall below 60FPS, vsync will automaticly be turned off, so you can actually get that 50FPS instead of being locked at 30 and 60. and when you hit 60 again, it turns back on automatically. this technology is only supported by Nvidias 600 series.