This is simply untrue, please do check. The G-Sync module only supports a Displayport output. And because it replaces the scalar of the monitor other outputs can't simply be "added". We're also talking about color processing, not color reproduction. Because G-Sync replaces the scalars employed by monitor makers to drive the panels, special color processing features of brands such as LG, Samsung, Dell and so on cannot be implemented, only what Nvidia implements into the module is available.