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Submission + - NVIDIA's G-Sync Is VSync Designed for LCDs (not CRTs).

Phopojijo writes: 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. The monitor will time its draws to whenever the GPU is finished rendering. 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.
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NVIDIA's G-Sync Is VSync Designed for LCDs (not CRTs).

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