What is the difference between 2.0 and 3.0 USB?

The main difference between USB 2.0 and USB 3.0 is speed. USB 2.0 has a max speed of 480Mbps (Mega bits per second,) which converts to 60MBps (Mega Bytes per second.) … USB 3.0 has a much higher max speed of 5Gbps (Giga bits per second, ie 1024Mbps) which translates to 640MBps.