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#6548
Software sync uses a timer to draw frames based on your refresh rate. In other words, you could compare it with a software VSync.
GPU sync is a UI element for the PLR's "Flush Previous Frame" setting. This setting is not recommended for SLI.
Video sync is actually the good old VSync option (notice that the usual VSync checkbox is now missing).
None means it will behave like the previous build, without VSync enabled.