By PURPLELEC | 03 July 2023 | 0 Comments
What is a USB4.0 interface
USB4.0 is the next generation of USB, and in equal measure, a specification that reboots, speeds up, and simplifies connectivity everywhere.
USB4.0: 2021 will see a wave of devices adopting the new USB standard, which goes beyond the usual speed improvements. USB4 is the newest version of USB that removes space and fixes some of the confusing issues of USB3. Plus, it adds new nuances like device compatibility and charging through the port, in addition to new speeds.
Where does USB4.0 come from? Part from an earlier USB specification; part from another interface. USB4 leverages the Thunderbolt3 protocol to deliver twice the speed of the USB version it replaces. In addition to greater bandwidth, USB4.0 can move and prioritize file and video data through its pipes more subtly than previous USB iterations. USB4 is backward compatible on its physical ports with all the old PC connection crowd: Thunderbolt3, USB3.2 and USB2.0 devices.
USB4 includes the Thunderbolt3 specification, which now matches the specification's top transfer speed, which is 40Gbps. That's double the peak speed (20Gbps) of the fastest previous-generation USB version, dubiously named USB3.2Gen2x2. That version of USB was never widely accepted.
Since every USB rollout seems to have a contractual obligation to sow some level of confusion, here's USB4.0: Not every USB4.0 device supports 40Gbps transfers. Some USB4 products will offer top speeds of only 20Gbps.
In simple terms, to judge the speed difference from USB4, you need to look for "20" or "40" in the logo on the box or spec sheet of the device you're considering.
One thing to note is that even the low-speed (20Gbps) version of USB4 will provide faster transfer speeds than most USB3.2 implementations. Although USB3.2 (the last of the family of USB specifications in the latest computers and peripherals) has a maximum bandwidth of 20Gbps in its USB3.2Gen2x2 variant, USB3.2 also has low-speed characteristics. These are much more common, with top speeds of only 5Gbps (USB3.2Gen1) or 10Gbps (USB3.2Gen2).
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