I dont see HDMI 2.1? Why?
I don't think it really matters as long as the HDTV is a half-way decent HDTV with HDR,etc..most of these 2018/2019 4K HDTV's that are mid range and up do HDR and true 120hz, what people want and like is 4K resolution at 120Hz, and maintains your 4:4:4 subsampling and is still plenty smooth.... If that is the case..You'll be able to get all those important benefits of HDMI 2.1 using the current HDMI 2.0 . You can get these important "gaming features" through current HDMI 2.0, again, as long as the 4K HDTV is decent. The only reason a gamer should care about having a GPU with HDMI 2.1 is if they are wanting to run their games at 8K at 60fpz/120fps and thats a pipe dream right now lol.
So if a gamer wants to have their PC connected to their 4K HDTV and run their PC games at 4K rez at a maximum of 120Hz, and maintains your 4:4:4 subsampling and is still silky smooth, this can be done with HDMI 2.0, as long as the 4k HDTV is decent, that has a 120hz true processor inside and can do that while keeping the 4 4 4 subsamp, HDR,etc,etc, Some of these 4k Sets claim it can do 120hz but honestly its not true 120hz, its 60hz but most mid-range 4k sets, that have come out in the last few years or for sure this year..can do this.