Software, so no G-Sync.
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Posted 20 August 2014 - 12:09
Technically, none of them half the framerate, they simply reduce the framerate to the refresh rate of the monitor (or in a multiple of it if the framerate drops below the refresh rate*). That's the only way that they can work to remove tearing though, by vertically syncing with the monitor (hence, vsync).
*Adaptive vsync will not use multiples if the framerate drops below the refresh rate.