Hi,
I have the 48 inch with win 10 latest update and 3090 latest update and a ps5.
In nvidia control panel, I use these settings.
As for gsync I use only full screen.
For the CX I am in Gamemode picture mode and HGIG both on PC and Ps5. Also PC mode is set for both (not the picture mode setting) but for the inputs themselves.
HDR option in windows ON and you can play HDR files with the latest VLC app or maybe use the plex app not the browser one.
P.s this tv is amazing quality wise!! not that many issues that would make me regret my purchase. Had it for 6 months and still in awe every time I turn it on..loll