HI, I was really looking forward to LTT's 3080 review to get more info on Nvidia's implementation of HDMI 2.1 on it's 30 Series cards. A Reddit Post by Nvidia says that 30 Series' HDMI 2.1 is full 48 Gbps, means it can do full 4K 120Hz 4:4:4 12-bit. Now what remains to be known is IF Nvidia implemented the full specs of HDMI 2.1 or not, including VRR (in addition to their proprietary G-Sync), ALLM, QFT & QMS etc.
Maybe LTT, Linus or Anthony can test the 3080 on their LG C9 and check the new HDMI 2.1 features. BTW LG downgraded their HDMI to 40 Gbps on 2020 CX as compared to the 2019 C9's HDMI being 48 Gbps. While it's a seperate story that LG left out this "downgrade" detail and the CX owners were outraged, but maybe 3080 + C9 can make a good informational video. Although, some C9 owners have reported on Reddit of screen flickering while running games on 3080 at 4K120hz on HDMI 2.1 and might need a Driver update from Nvidia.
The 2019 C9 has full 48Gbps ports capable of 4K 120Hz 4:4:4 12-bit.
The 2020 CX only has 40Gbps ports capable of 4K 120Hz 4:4:4 10-bit.
oh and the upcoming Xbox Series X also has 40Gbps port.