USB2.0 Vs USB3.0

High speed data is clocked at 480.00Mb/s with a data signalling tolerance of ± 500ppm.
Full speed data is clocked at 12.000Mb/s with a data signalling tolerance of ±0.25% or 2,500ppm.
Low speed data is clocked at 1.50Mb/s with a data signalling tolerance of ±1.5% or 15,000ppm.

http://www.beyondlogic.org/usbnutshell/usb2.shtml

§Device Signaling (ERDY) support rather than host polling (PING) as in USB2.0
§Data is not broadcast as in USB2.0 to save power, routing-string information in a packet enables only required hubs/ports between a host and a device

Fast U1 and U2 low power states in addition to traditional suspend (U3)

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