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[ScratchTehEPICSpaceDude]

What exactly is Vsync?

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[dawngaward0110]

Some monitors have a problem where not all pixels are in sync, which results in an awkward effect where (for ex.) half of an object is discentered/cut off.

Vsync fixes this.

[Headcrab Zombie]

Some monitors have a problem where not all pixels are in sync, which results in an awkward effect where (for ex.) half of an object is discentered/cut off.

Vsync fixes this.

It has nothing to do with the monitor having a problem, nor individual pixels being out of sync
If the video card is rendering frames faster than the monitor can display them, then you have two different frames being displayed at the same time, resulting in a 'tearing' effect.
Vsync makes the video card wait until the monitor is completely done displaying a frame to send it the next one.

[MegaScientifical]

And on a partially related note, some games have problems with vsync of since they are built to use it. I have been told that Giants launching people in Skyrim is caused by vsync being off, which allows the game to process faster than the physics engine can account for. But Torque could never have such a noticeable problem with vsync. :)