Well, it helps that you have G-Sync active 
Virtually none of this matters if you’ve got the benefit of G-Sync.
Also, when using G-Sync always use the Low Latency Mode in the framerate limiter advanced tab. That changes when the limiting is applied, with it off the CPU creates a frame but it gets delayed until target fps.
With it on, the new frame doesn’t start until target fps. Basically, it polls input closer to the actual image going out onto screen… but it would cause unstable framerates w/o G-Sync.