templarklimek :
Gents educate me on this. I just bought a 70" samsung 4K tv as a monitor. 120 refresh rate. It's HUGE and a wonderful display. $1100.00(returned to microcenter). Why not use 40-65 inch TV'S? Thanks
TVs advertized as "120 Hz" don't usually accept 120 Hz input, but only 60 Hz and then interpolate every other frame displayed to achieve the 120 Hz.
Some brands even go as far as advertizing "SpecialProprietarySmoothMotion(TM) (or whatever) 240 Hz", where in reality they only accept 60 Hz input, interpolate to 120 Hz, and then use various motion smoothing techniques that (according to the marketing) will achieve motion fluidity comparable to real 240 Hz video.
Common to both the above cases is that TVs have various techniques in place that are meant to smoothen the motion of video, but at the same time increase response time in interactive use (user input affects what happens on the screen), which doesn't work well for fast-paced gaming. Some TVs have a game mode that may have less processing to reduce the latency.
Neither G-Sync or FreeSync/DisplayPort Adaptive Sync are used in TVs (and they usually don't have DisplayPort), so this makes them inferior when dealing with fast-paced games.