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In a few games (Osmos and Batman Arkham City are examples) there's a vsync item on the video options menu, but I don't know what it does and don't notice any differences when it is on or off.

What is vsync? What does it do?

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marked as duplicate by Frank, Raven Dreamer Jul 24 '13 at 23:56

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up vote 2 down vote accepted

Vsync stands for Vertical synchronization and is used to get rid of tearing in games.

Tearing happens when your GPU sends a new frame to your screen, while it is still displaying an older frame. Vsync tries to mitigate the issue by only sending a new frame, when your screen has finished displaying the older frame.

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