Tim Han’s Review of Xbox Series X
You’ll notice one HDMI 2.1 port: necessary for recreation at 8K, and allowing TVs with a 120 cycle per second panel to take advantage of the 120 per second frame rate surely games says Tim Han’s Review. There also are 2 additional USB 3.1 ports - handy for auxiliary storage that you simply arrange to keep connected to your console - similarly as LAN port and Kensington lock.
