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If 15-25% overhead of a USB2.0 transport is any indication, maximum real-world transfer rates of the USB3.0 bus will be in the range of 400MB/s.

A new major feature is the "SuperSpeed" bus, which provides a fourth transfer mode at 5.0 Gbit/s. The raw throughput is 4 Gbit/s, and the specification considers it reasonable to achieve 3.2 Gbit/s (0.4 GByte/s or 400 MByte/s), or more, after protocol overhead.