I recently bought a 2020 LG 55CX but was waiting to get my hands on an RTX 3080. I finally found them and needed an HDMI connection that actually supports 4K at 120Hz for this absolute beast of a graphics card and TV. For it to work fully, make sure you have the NVIDIA Control Panel open, scroll down to 120Hz for a 3840×2160 TV. The top option is HD only, so it only runs at 60Hz. You MUST scroll down to PC. Once selected, it worked like a charm! The picture looks great in 120Hz gaming with this cable as it supports Full HDR. It's also very, very cheap ($50) compared to some of the other options I almost bought until I saw this one that are in the ($100-$170) range. Just buy it!