1, Maximum transmission speed of 40 Gbps:
Through dual-channel transmission, the theoretical maximum transmission speed of USB4 should be 40 Gbps, which is the same speed as Thunderbolt 3 (hereinafter referred to as “Thunderbolt 3”).
In fact, USB4 will have three transmission speeds: 10 Gbps, 20 Gbps, and 40 Gbps. So, if you want to buy the highest transmission speed, that is, 40 Gbps equipment, it is best to check the specifications before buying.
2. Compatible with Thunderbolt 3 interface:
Some (but not all) USB4 devices are also compatible with the Thunderbolt 3 interface, which means that if you have a USB4 interface on your device, it is possible to also connect Thunderbolt 3 devices. However, this is not mandatory. Whether it is compatible or not depends on the attitude of the equipment manufacturer.
3. Have dynamic bandwidth resource allocation capabilities:
If you use the USB4 port as well as an external display and data transmission, this port will allocate the appropriate bandwidth according to the situation. For example, if video only needs 20% of the bandwidth to drive a 1080p display, the remaining 80% of the bandwidth can be used for other things. This was not possible in the era of USB 3.2 and before. Before this, the way USB worked had to take turns.
4.USB4 devices will all support USB PD
USB PD is USB Power Delivery, which is one of the mainstream fast charging protocols. It is also formulated by the USB-IF organization. This specification can achieve higher voltage and current, and the power delivered can reach up to 100W., And can freely change the direction of power transmission.
