The only catch is that this will only work for new displays. Existing G-SYNC based displays will not be able to support this feature:
That means that in the future a display featuring an NVIDIA G-sync module could work with compatible games consoles for HDMI-VRR. It could also work with any graphics card based on the adaptive-sync standard over HDMI and DisplayPort. This means that you would be able to use a Native G-sync screen (with module) from an AMD graphics card for VRR! So if you have an AMD graphics card, you could still enjoy the VRR experience and other additional benefits that the G-sync module brings even from a Native G-sync screen, which was previously out of reach to those users.
This new firmware is being used now for future Native G-sync screens, and the Acer Predator XB273 X is the first we’ve seen advertised with these new features. We confirmed with NVIDIA that it will NOT be possible to update firmware to any existing Native G-sync screen, or request updates to allow your current G-sync screen to be updated so that it would work with AMD graphics cards. The new firmware will only be applied to future G-sync module displays.