Make sure to also cap your FPS or use Vsync. No point pumping out 100fps when you have only a 60hz TV, etc.
For variable refresh rate monitors, it's best to use framerate limiters as well: either in-game or in the Nvidia control panel. Set the cap at least a few fps lower than your monitor's max refresh rate. Even better, aim for 90-100 fps cap, beyond which diminishing returns kick in and power bills continue to creep up.