Hi!,
As you probably know, all of the Nvidia Graphic Card mount currently mount a 2.0b hdmi output. That's is not enough to get 4k@120hz + HDR4k@120hz + HDR in my LG CX but I have seen some solutions linked to the chroma subsampling, reducing the 4:4:4 to 4:2:2 or 4:2:0.
I would test it by...