I’ll start with the hardware of note:
GPU – GTX 1080
HDMI to DisplayPort adapter – Club 3D DisplayPort 1.4 to HDMI 2.0b HDR
So, fairly simply when I plug the TV directly into the GPU via HDMI I can get 4096 x 2160 at 60hz, but when I plug it in to through the DisplayPort adaptor I can only get 3840 x 2160 at 60hz. If I try to switch to 4096 x 2160 it just reverts back to 3840 x 2160 no matter what the refresh rate is.
The HDMI to DisplayPort claims to be certified for 4096 x 2160 @ 60hz.
Any help would be most appreciated!