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PC Interface PCI Express 3.0 Ports 4 external USB3.0 Transfer Rate USB3.0 up to 5Gbps (backwards compatible with USB1.1/2.0) Power Input 4 Pin power USB Power Output +5V / 900mA (each port) Bracket Form Standard 121mm OS Support Windows XP / Server 2008 R2 / Vista / 7 / 8 Dimension 120 x 70 x 20m m (L x W X H)