Which methods of software vsync don't half the framerate?

[Elliot B.]

Software, so no G-Sync.

[+Majesticmerc MVC]

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.

[The_Decryptor Veteran]

Triple buffering, uses more memory and increases latency though.