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USB 3.0 PCI-EX Card Compliant with USB 3.0 specification Rev 1.0 , which is released by USB Implementers Forum,Inc Support the following speed data rate as follows; Low-Speed(1.5Mbps)/ Full-Speed(12Mbps)/ High-Speed(480Mbps)/ Super-Speed(5Gbps) Support 2 downstream ports for all speeds