Regardless of the 8K in its name, the HDMI 2.1 port can support only as higher a resolution as an external 4K Screen at 60Hz refresh level, and also Exhibit options of 2K/144Hz and 1080p/240Hz. Apple Screen limitations imply that its possible 8K/30Hz Exhibit support is restricted to Windows equipment. https://sethxtmet.creacionblog.com/26610936/5-simple-statements-about-usb-c-digital-av-multiport-adapter-explained