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?