USB 4 is ready to appear at twice the speed of existing USB 3.2. Now, VESA has confirmed that this new USB standard will fully support the extremely high bandwidth of DisplayPort 2.0. That means that USB 4 will be compatible with devices that need huge speed like 8K 60Hz HDR screens or even 16K 60Hz.
In fact, USB 4 only supports up to 40Gbps, while the speed of DisplayPort 2.0 supports up to 80Gbps. However, USB 4 can send and receive up to 40Gbps at the same time, so VESA has taken advantage of that with a new parameter standard called DisplayPort Alt Mode 2.0. Because DisplayPort is mainly used for video, sending only one-way data from the PC to the screen, so Alt Mode 2.0 standard will repeat the data pins of the USB to work only in one direction, carrying gives us double the speed.
According to Anandtech, Alt Mode 2.0 will support the usual USB 4 cable. Besides, monitors also do not need USB 4 controllers. This will help simplify the design of the screen. Because it also supports Thunderbolt 3, USB 4 will become a popular connection standard for both smartphones and PCs, supporting things like “docking, gaming, AR / VR HMD as well as professional HDR monitors”.