The USB Promoter Group has announced USB4 2.0 with a record bandwidth of up to 80 Gbps - twice as fast as Thunderbolt 4 and USB4 1.0. This is due to a redesigned physical layer architecture (PHY), as well as improved data transfer protocols. PHY is compatible with 40Gbps and 80Gbps USB Type-C cables.
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The new standard supports DisplayPort 2.0 and PCIe 5.0 and is compatible with USB4 1.0, USB 3.2, USB 2.0 and Thunderbolt 3. The PHY upgrade allows tunneling over USB 3.2 at more than 20 Gbps.
As USB-IF spokesman Joe Balich pointed out in a conversation with The Verge, the current 40Gbps USB-C cables already on sale will also support 80Gbps speeds in the future. Balich did not explain how this is technically realized. However, he said, "this advantage has become a requirement in the development of the new specification, and details on how 80Gbps signals are transmitted will be disclosed when the final specification is released."
The new data will likely be made available before the USB DevDays event scheduled for November 1 and 2 this year in Seattle and November 15 and 16 in Seoul. No timeline has been given for USB4 2.0 implementation on the devices.