From my testing (on Win7), that just worsens the problem, makes refreshes slower and causes DWM to eat tons of memory. You need two dedicated GPUs each being accelerated, like this: http://i.imgur.com/4zjEeM5.png Again, I only have experience with Win7, so this might not apply to 8/8.1/10. (I'll probably only try 10 after it's less beta status.. 10.1 anyone?) And, does setting the game to windowed or borderless with your desktop at 120Hz really not work? That should override anything the game sets, unless it literally forces your resolution/refresh rate to max on startup.