This is the correct answer to tackle power draw. Use Vsync/Adaptive Sync for fixed refresh monitors, or FreeSync/GSync for variable refresh monitors.

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.