The USB-C connector physically supports 20 Gbit/s per pin in the USB4 spec (4 pins total: 2 rx + 2 tx, that's why we say it's "40 Gbit/s" per direction). Displa

The USB-C connector physically supports 20 Gbit/s per pin in the USB4 spec (4 pins total: 2 rx + 2 tx, that's why we say it's "40 Gbit/s" per direction). DisplayPort configures all 4 pins as tx, so as expected it achieves 4 x 20 = 80 Gbit/s.