(USB 3.0) Vs (USB 2.0)
USB 2.0 USB 3.0
Released Apr-00 Nov-08
Speed High Speed or HS, 480 Mbps (Megabits per second) 10 times faster than USB 2.0. Super Speed or SS,
4.8 Gbps (Giga bits per second)
Signaling Method Polling mechanism i.e can either send
or receive data (Half duplex)
Asynchronous mechanism i.e. can send and receive
data simultaneously (Full duplex)
Power Usage Up to 500 mA Up to 900 mA. Allows better power efficiency with less
 power for idle states. Can power more devices from one hub.
Number of wires within the cable 4 9
Standard-A Connectors Grey in color Blue in color
Standard-B Connectors Smaller in size Extra space for more wires
Max Cable length 5 meters 3 meters
 
The USB-C connectors connect to both hosts and devices, replacing various USB-B and USB-A connectors and cables with a standard meant to be future-proof. The 24-pin double-sided connector is slightly larger than the micro-B connector, with a USB-C port measuring 8.4 millimetres (0.33 in) by 2.6 millimetres (0.10 in). The connector provides four power/ground pairs, two differential pairs for non-SuperSpeed data (though only one pair is populated in a USB-C cable), four pairs for SuperSpeed data bus (only two pairs are used in USB 3.1 mode), two "sideband use" pins, VCONN +5 V power for active cables, and a configuration pin used for cable orientation detection and dedicated biphase mark code (BMC) configuration data channel.