USB Implementers Forum (USB-IF), the support organization for the advancement and adoption of USB technology, today announced the publication of the USB4 Version 2.0 specification, a major update to enable USB 80 Gbps performance over the USB Type-C cable and connector. The updated USB4 specification doubles the maximum aggregate bandwidth of USB to the benefit of higher-performance displays, storage, and USB-based hubs and docks. The USB Type-C and USB Power Delivery (USB PD) specifications have also been updated to support this higher level of data performance.

"For engineers, USB4 is defined by its multi-protocol tunneling that architecturally differentiates it from its predecessors - USB 3.2 and USB 2.0," said Brad Saunders, USB-IF Board Chair and CEO. "This updated technical specification extends USB4 speed and data protocol performance, enabling manufacturers to develop products that can deliver USB 80 Gbps in addition to existing USB 40 Gbps and USB 20 Gbps to end users."

The recent 80 Gbps USB4 Version 2.0 standard looks set to get company from Thunderbolt at 80 Gbps in the not too distant future, as Intel has demoed its next generation Thunderbolt hardware to the media during its Technology Tour 2022 in Israel. It doesn't appear that Intel showed too much of the upcoming technology, but the company did apparently show it running at 80 Gbps, or if you want to be picky, two times 40 Gbps in dual link mode, much in the same way USB4 Version 2.0 will operate.

According to Tom's Hardware, Intel hasn't set the marketing name in stone quite yet, so it's not clear what Intel will be calling its next generation of Thunderbolt. What is clear is that Intel will continue to deliver on its own Thunderbolt products, despite USB4 having almost feature parity with Thunderbolt, apart from some Intel platform specific features. What is also unknown, is a potential availability date for Intel's next generation of Thunderbolt, but an educated guess will be before USB4 Version 2.0 launches.

It was only yesterday that the USB Promoters Group announced the USB4 Version 2.0 spec with support for speeds of up to 80 Gbps, something TechPowerUp mentioned at the end of our USB4 article back in June. Now details of a 120 Gbps asymmetric mode has popped up, courtesy of Angstronomics and we've managed to confirm that it is indeed something that is coming from one of our own sources. We were in fact told back in June that the 80 Gbps mode was meant to be asymmetric, but this was not mentioned in the recent press release.

The 120 Gbps mode will use three of the four data pairs for upstream data and the fourth 40 Gbps data pair will be for downstream data from and to the host controller.Asymmetric data transfers are nothing new over USB Type-C cables, as the DP Alt Mode is already taking advantage of this. This is possible because USB4 Version 2.0 will move to PAM3 (Pulse-Amplitude Modulation) data encoding from today's 64/66- or 128/132-bit encoding. The next generation of Thunderbolt is also expected to use PAM3 encoding to reach the rumoured 80 Gbps speeds that were posted somewhat by mistake by an Intel executive last year.

The USB Promoter Group today announced the pending release of the USB4 Version 2.0 specification, a major update to enable up to 80 Gbps of data performance over the USB Type-C cable and connector. The USB Type-C and USB Power Delivery (USB PD) specifications will also be updated to enable this higher level of data performance. All of these specification updates are expected to be published in advance of this year's series of USB DevDays developer events planned for November.

Protocol updates are also being made to enable higher performance USB 3.2, DisplayPort and PCI Express (PCIe) data tunneling to best use the higher available bandwidth. "Once again following USB tradition, this updated USB4 specification doubles data performance to deliver higher levels of functionality to the USB Type-C ecosystem," said Brad Saunders, USB Promoter Group Chairman. "Solutions seeing the most benefit from this speed enhancement include higher-performance displays, storage, and USB-based hubs and docks."