Originally posted by dstroy:

Vsync only ensures delays of input and screen output.

Actually, VSync tries to limit the framerate to some safe and sane multiple of what your monitor can actually push (0.5 is a "sane multiple" in this instance, and it's also supposed to be capped at your monitor's reported refresh rate). It makes sure that the GPU is only rendering frames that will actually get displayed, while avoiding "screen tearing" that can occur when the GPU pushes a render frame to the monitor when the buffer is only partially drawn.

You want to save electricity? Turn on VSync, so your GPU isn't trying to render 120 FPS to your 60FPS monitor... especially in the menu, where the item count is minimal and the framerate is uncapped; your GPU is probably spamming 600+ FPS render frames of a half-dozen buttons and a campfire.

You might also want to find the actual specs (or better yet, the manufacturer's WHQL driver) for your monitor, so Windows knows its true capabilities instead of using the default "PnP Display" settings. Might make your color and gamma settings work out better, too.