https://plugable.com/blogs/news/what-s-the-difference-between-thunderbolt-3-thunderbolt-4-and-usb4 https://plugable.com/blogs/news/what-s-the-difference-betwee.

https://plugable.com/blogs/news/what-s-the-difference-between-thunderbolt-3-thunderbolt-4-and-usb4 https://plugable.com/blogs/news/what-s-the-difference-betwee... The short answer for Thunderbolt 4 over Thunderbolt 3 is "a second 4K display" thanks to double the PCIe bandwidth, 16Gbps vs 32Gbps. (The main data channel is 40Gbps in both.) USB 4 is actually a bit more constrained than Thunderbolt 3, at 20Gbps data channel, and no guarantee of PCIe bandwidth. > Thunderbolt 4 guarantees support for one 8K display or two 4K displays. A USB4 port can only support one display with no mention of resolution minimums. And even that isn't required as some USB4 ports will not support video at all.