Been playing around a lot and getting a much better understanding of monitor refresh rates (hz) and fps.
I have set the AOC to 72hz which does a few things for me. This stops the input not supported message and so stops the need to have to go into the service menu to disable the warning message.
This is also the most hz i can get without frame skipping happening, now i have been playing around and found at 72hz in BF4 with vsync off which give a FPS of around a 100 in the test range on average, i get a not so smooth feel to it, like blur or slowness.
Now with vsync on at 72hz in BF4 this locks the FPS to 72 (never drops below) and the game feels much much more smooth, glides around in the chopper and is clearer in view.
The strange thing is at 120hz with vsync off its smooth, but at 72hz with it on its as smooth if not clearer and smoother. So Vsync in my limited usage and experience makes the game better with the hz lower and there for locked at 72hz.
Not having to mess around with setting the monitor to not show the unsupported message and having a loss of DP connection this morning forced me to learn more and i prefer it as i have it set at present, less messing about more fluidity
Hope this makes sense, essentially frame skipping is easily seen if you turn vsync off and then on at 72hz, at 60hz and vsync off it feels much less smooth than at 60hz with vsync on.
72hz frame skipping test
Should also say im now using 14.1 betas and testing mantle api