Nvidia’s proprietary driver is notorious for having a lot of tearing and vsync issues. Even if you use their control panel to enable vsync, more often than not it will have no effect. I’ve seen this on a GTX 560, on a 650 Ti, 660 Ti, 860M. Previously I tried using compton to fix this issue, but compton sometimes makes e.g. video display sluggish or seems to add some delay and irregular framerate to games. This won’t work, since for games I want a constant framerate, and drops below 25 or so are unacceptable.

That’s when I found out about about the ForceCompositionPipeline option for the proprietary Nvidia driver. It can be used like this to enable it temporarily from the command line:

nvidia-settings --assign CurrentMetaMode="DVI-I-1: nvidia-auto-select { ForceCompositionPipeline = On }"

Or made permanent in xorg.conf:

Section "Screen"
    …
    Option         "metamodes" "DVI-I-1: nvidia-auto-select { ForceCompositionPipeline = On }"
EndSection

You’ll have to use something like xrandr to figure out the name of the output (in this example, DVI-I-1). Thank you, Mark Volker Dickmann, for this hint.