Sid Jeong :
Does this mean we won't have to care about fps anymore?
Will 20 fps on 20hz g-sync'ed monitor look as smooth as 60 fps on regular monitor?
no, 20fps is still 20fps, it can never look like 60fps. Game's fps is always variable, so with normal vsync, with a 60hz monitor for example, at 20fps, the monitor refreshes 3 times for one frame displayed, which is fine. But at 23fps, the monitor cant display this with vsync on, 23 can not be divided into 60 evenly, so it drops down to 20fps to keep frames synced with the monitor, so you get a slight delay in the game engine before the frame is released to the monitor to keep things in sync (this is how you get stutter and input lag from your mouse/keyboard). Compare this with gsync, a constant variable refresh rate synced with the frame rate there is no delay, no fps drops, no stuttering, the game engine/rendering doesnt have to slow down to keep things synced, so having similar fps will feel way smoother with g-sync. Personally, i cant wait to get a monitor that supports this, so long as they aren't ridiculously priced.