VSync Causing Choppiness?

[darkfrog]

I've got a simple textured cube that I'm rotating on-screen and with vsync enabled it looks choppy as it animates, but if I disable vsync it's absolutely and perfectly smooth.  This seems backwards of what I would expect to be the case.  I understand that vsync will lock for monitor refreshing, but this shouldn't manifest in visual choppiness.  I've got two nVidia GTX 460s with SLI and zero GCing happening.

Any suggestions?

[kappa]

IIRC Vsync only works properly in fullscreen but could be wrong.

[darkfrog]

Thanks, I'll give that a try and see if that makes a difference.

[avm1979]

Vsync works fine for me in windowed mode...

Are you using windows XP? If so, do you have a Thread.sleep() in your render loop? Longer delays between successive sleep calls could actually make the amount of time it sleeps for rather inaccurate.

This could also be driver-related - I'd update to the latest just in case it solves your headache, before spending too much time trying to debug it.