USB 2.0 employs a communication architecture where the data transaction must be initiated by the host. The amount of current draw for USB 3.0 devices operating in SuperSpeed mode is now 900 mA, resulting in an increase in total power delivery from 2.5 W to 4.5 W (at 5 V). USB 3.0 also provides more efficient power management and increased power delivery over USB 2.0. The higher bandwidth also allows for faster frame rate, increasing the performance of the system. Users can now use fewer cameras while still covering the same imaging area with large resolution USB 3.0 cameras. This has created significant cost-saving opportunities for integrators as well as improving the overall system speed and efficiency. This important transfer mechanism has enabled machine vision camera vendors to build high-throughput USB 3.0 cameras. The effective bandwidth available via the bulk transfer method is around 400 MByte/s approximately 10 times that of USB 2.0.

USB 3.0 has improved upon the bulk data transfer mechanism of USB. Another important feature of USB 2.0 is that it supports Windows XP through Windows update. It also allowed for multiple high-speed devices to run simultaneously. With the increased bandwidth, high throughput peripherals such as digital cameras, CD burners, and video equipment could now be connected with USB. It increased the data transfer rate for PC to USB device to 480 Mbps, which is 40 times faster than the USB 1.1 specification. In 2002, a newer specification USB 2.0, also called Hi-Speed USB 2.0, was introduced.

Besides different connectors used on USB 3.0 cables, they are also distinguishable from their 2.0 counterparts by either the blue color of the ports or the SS initials on the plugs.Ī successor standard named USB 3.1 was released in July 2013, providing transfer rates up to 10 Gbits/s (1.25 GB/s, called “SuperSpeed+”), which effectively put it on par with the first version of Thunderbolt. Among other improvements, USB 3.0 adds a new transfer mode called “SuperSpeed” (SS), capable of transferring data at up to 5 Gbits/s (625 MB/s), which is more than ten times as fast as the 480 Mbit/s (60 MB/s) high speed of USB 2.0. USB 3.0 is the third major version of the Universal Serial Bus (USB) standard for computer connectivity. Summary of key USB 2.0 and USB 3.0 technical specifications.

Usb 2 vs usb 3 power requirements