A:Answer HDMI that transfers at 48gigs....be careful to read the box, a "Premimum" cable that's not 2.1 only transfers at 18 gigs.
you only need hdmi 2.1 for 4k 120hrz, and hdr 4k...mainly for new gaming consoles. I can say if you do have a new game console or any new media device with 2.1 out...you will see a big difference using the right cable. just make sure you are using the correct hdmi input ports on tv.