If you do not see the option to disable VSYNC in your particular game settings, you can force VSYNC off globally in the NVIDIA control panel. To do this, open your NVIDIA control panel and click on 'Manage 3D Settings'. In the center you will see the various 3D settings. Scroll to the bottom of the list and you will see 'Vertical Sync.' Click on it and choose 'Force Off.'  If you notice tearing in games, force the Vertical Sync on to resolve it.