![]() USB4 Version 2.0's specification was released late in 2022 (making USB even more confusing for everyone), and increases USB4's bandwidth from 40 to 80Gbps, with an optional 120Gbps mode that only works in one direction, leaving the other direction with just 40Gbps of bandwidth. USB4 devices and cables can be either 20Gbps or 40Gbps while Thunderbolt 4 requires 40Gbps, so not all USB4 ports and cables may be equivalent to Thunderbolt. The foundation of USB4 is Intel's old Thunderbolt 3 protocol, and naturally, USB4 is somewhat compatible with Thunderbolt - emphasis on somewhat. ![]() There's one additional point to USB4: Thunderbolt. The first USB4 2.0 devices won't be out until late 2023 at the earliest. USB 3.2 Gen 1 was actually the same as USB 3.1 Gen 1, USB 3.2 Gen 2 was the new USB 3.1 Gen 2 and USB 3.2 Gen 2x2 was the newest and fastest offering speeds at up to 20Gbps. In September 2017, the USB 3.2 specification was published which yet again brought a change in the naming scheme. ![]() While the first one retained USB 3.0's 5Gbps (SuperSpeed) transfer mode, Gen 2 introduced SuperSpeed+ transfer mode with maximum data signaling rate to 10Gbps. It was launched in two versions, USB 3.1 Gen 1 and USB 3.1 Gen 2. The USB 3.1 specification was first announced in July 2013 and this is where things started to get a bit confusing. The first set of devices featuring USB 3.0 came out in January 2010. The new standard also focused on decreasing power consumption, increasing power output, and providing backward compatibility with USB 2.0. 12, 2008, to further increase data transfer speeds to up to 5Gbps, which was also called SuperSpeed. Hewlett-Packard, Intel, Lucent Technologies (Nokia), NEC, and Philips pushed for higher data transfer rates, where the new standard brought speeds of up 480Mbps. In April 2000, the USB 2.0 specification was announced after getting consent from the USB Implementers Forum (USB-IF).
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