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USB4 transfer speed compatibility

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Author : PURPLELEC
Update time : 2024-03-16 10:20:26
  USB4 supported transfer speeds
  USB4 supports speeds of up to 40Gbps, which is double the current USB 3.2 standard (20Gbps), but whether this speed can be reached depends on the type of device used.
  USB cables currently use two-way "channels" to send and receive signals from the devices they are connected to. USB4 changes this and allows certain devices to transmit in one direction. For example, DisplayPort 2.0's "Alt mode" will increase the available signal bandwidth to 80Gbps, high enough to support 8K HDR video monitors and other high-speed devices over USB4.
  USB4 also supports the USB PD charging standard, which means that smartphones and other devices can charge much faster under the USB4 specification, provided of course that they support fast charging.
  USB4 devices can support three maximum speeds: 10Gbps, 20Gbps and 40Gbps. If you buy a PC or USB hub with USB4, make sure to check the specs of the device to find out its maximum supported speeds.
  There's also a speed-related feature that really puts a feather in USB4's cap, which is the ability to dynamically adjust the amount of resources available when sending video and data over the same connection. So, let's say you have a USB 4 max 40Gbps and you're outputting to a 4K monitor while copying a bunch of files from an external SSD. We specify that video feeds require around 12.5 Gbps. In this case, USB 4 will allocate the remaining 27.5 Gbps to the backup drive.
  In addition, USB4 also has the function of dynamically adjusting the speed. For example we have USB 4 at 40 Gbps and are outputting to a 4K monitor while copying a large number of files from an external SSD. And stipulates that video requires approximately 12.5 Gbps. In this case, USB 4 will allocate the remaining 27.5 Gbps to your backup drive.
USB4 speeds
  Will USB4 be backward compatible with USB3.0, USB2.0, USB1.0?
  USB4 cables will use a TYPE-C connector, which is the flat, round port found on most smartphones and laptops today. We see this connector type used in many industrial small form factor single board computers.
  USB4 cables can be plugged into any USB Type-C port, but this does not mean that their functions are the same. For example, a USB4 cable will lose speed when plugged into an older port, and an older USB Type-C cable plugged into a USB4B 4.0 port will use its maximum transfer speed by default (but won't be able to reach the same speeds as a USB4 cable).
USB4 speeds