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G-Sync is a proprietary adaptive sync technology developed by Nvidia aimed primarily to eliminate screen tearing and the need for software deterrents such as Vsync. G-Sync eliminates screen tearing by forcing a video display to adapt to the framerate of the outputting device rather than the other way around, which could traditionally be refreshed halfway through the process of a frame being output by the device, resulting in two or more frames being shown at once.〔(【引用サイトリンク】title=Review: Nvidia G-Sync Makes Your PC Games Look Amazing )〕 In order for a device to use G-Sync, it must contain a proprietary G-Sync module sold by Nvidia.〔(【引用サイトリンク】title=G-SYNC.com )〕 ==Criticism== G-Sync faces some criticism due to its proprietary and exclusionary nature, due to it still being pushed when free alternatives such as VESA standard Adaptive-Sync, a specific brought from eDP, are now an optional feature of DisplayPort version 1.2a. While AMD's FreeSync relies on the above mentioned optional component of DisplayPort 1.2a, G-Sync requires an Nvidia-made module in place of usual scaler in the display in order for it to function properly with select Nvidia GeForce graphics cards. However must be noted that currently not all features offered by G-Sync can be achieved relying on VESA display standard, to avoid flickering below the minimum refresh rate of a panel G-Sync inserts duplicate frames and doubles the panel's refresh rate every time the frame-rate delivered by the GPU reaches the minimum panel refresh rate, further, NVIDIA built a special collision avoidance feature to avoid the eventuality of a new frame being ready while a duplicate is painting on the screen (something could generate lag and/or stutter) in which case they anticipate the refresh and wait for the next frame being completed. Overdriving pixel becomes also tricky in a non fixed refresh scenario and solutions predicting when the next refresh is going to happen and accordingly adjust the overdrive value must be implemented and tuned for each panel in order to avoid ghosting. ==GPU and system requirements== * GPU: G-SYNC features require an NVIDIA GeForce GTX 650Ti BOOST GPU or higher. * DRIVER: R340.52 or higher. * Operating System: Windows 7, 8, 8.1 and 10 * System Requirement: Must support DisplayPort 1.2 directly from the GPU.〔(【引用サイトリンク】url=http://www.geforce.com/hardware/technology/g-sync/system-requirements )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「G-Sync」の詳細全文を読む スポンサード リンク
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