In version 1 of nvidia-settings found in nvidia's ftp, there was a gui option to change XVideoSyncToDisplay. In the latter versions, this option is not present anymore. Is there a reason for this? It makes big difference when using a TwinView setup with different refresh rates in each screen. If the wrong display is selected, tearing can be seen in the video, which is VERY annoying when the screen happens to be a HDTV LCD Panel!