NVIDIA's G-Sync Is VSync Designed For LCDs (not CRTs)

[wraggster]

A monitor redraws itself top to bottom because of how the electron guns in CRT monitors used to operate. VSync was created to align the completed frames, computed by a videocard, to the start of each monitor draw; without it, midway through a monitor's draw process, a break (horizontal tear) would be visible on screen between the two time-slices of animation. Pixels on LCD monitors do not need to wait for above lines of pixels to be drawn, but they do. G-Sync is a technology from NVIDIA to make monitor refresh rates variable (http://www.pcper.com/news/Graphics-Cards/NVIDIA-Announces-G-Sync-Variable-Refresh-Rate-Monitor-Technology). The monitor will time its draws to whenever the GPU is finished rendering (http://blogs.nvidia.com/blog/2013/10/18/g-sync/). A scene which requires 40ms to draw will have a smooth 'framerate' of 25FPS instead of trying to fit in some fraction of 60 FPS."NVIDIA also announced support for three 4k displays (http://techgage.com/news/forget-choosing-between-4k-or-3x1-enter-nvidias-surround-4k/) at the same time. That resolution would be 11520×2160.

http://tech.slashdot.org/story/13/10/18/1955201/nvidias-g-sync-is-vsync-designed-for-lcds-not-crts