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Tip #150: USB Bandwidth

Larry Jordan – LarryJordan.com

Different versions of USB provide different amounts of bandwidth

Topic $TipTopic The speed of USB has increased significantly since its initial release. For example, USB 1.0 was released January 15, 1996, with a maximum speed of 1.5 MB/second. Compare that to USB 4.0 which was released August 29, 2019, with a maximum speed of 5 GB/second! USB4 is based on the Thunderbolt 3 protocol.

However, recently, the USB Implementers Forum (USB-IF) renamed virtually all USB versions and made things REALLY confused. Here are the new names and speeds of the different versions of USB.

Old Name Released New Name Speed
USB 2.0 April, 2000 USB 2.0 Up to 60 MB/sec
USB 3.0 Nov. 2008 USB 3.1 Gen 1 Up to 625 MB/sec
USB 3.1 July, 2013 USB 3.1 Gen 2 Up to 1.25 GB/sec
USB 3.2 August, 2017 USB 3.1 Gen 2×2 Up to 2.5 GB/sec
USB4 August, 2019 USB 4 Up to 5 GB/sec

NOTE: Keep in mind that all versions of USB, except for USB4, are optimized for small file transfers and generally don’t provide all the bandwidth that the spec calls for. I don’t recommend any version of USB earlier than USB 3.2 for video editing.


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4 Comments
    • Larry Jordan
      Larry Jordan says:

      Marc:

      Depending upon which port you plug into, your iMac supports USB 3 and USB-C.

      Check your System Report for more details.

      Larry

      Reply

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