G-SYNC was never limtied to SDR.
Windows does not support HDR at 8-bit 4:2:0. The minimum for HDR is 8-bit RGB / 4:4:4 with dithering or 10-bit 4:2:0.
So does G-Sync work with HDR 4:4:4 now? Manually switching to something different every time I want HDR and G-Sync is kind if a no-go for me.