I understand 4k120hz doesn’t have a ton of use w the steamdeck, but my monitor supports 4k120hz nd i will play a ton of retro games

im confused about the 120hz capability on 4k tho, a lot of people say you can’t do it through HDMI at all, some say specific docks/dangles wont do it cuz they dont have HDMI 2.1, so can anyone clear this up for me?