Caporegime
Saw that but the 2 meter version on lighting deal yesterday and grabbed it for around £9This Cable:
https://www.amazon.co.uk/gp/product/B083TZ2Y3Y/
These settings:
I swapped out my 2080Ti for the 3090 and used the same HDMI port on the TV, which was HDMI 1 and it was set on the TV with the 'PC' symbol. This is where the issues came from (see earlier post in the thread) where I had flickering.
When I tried HDMI 4 which was set to 'Console' it worked fine with 4k/120hz/4:4:4/HDR on and G-sync enabled, with no issues at all.