DC 4PIN socket provides power to each USB 3.0 connector up to 900mA to ensure huge current consumption for USB devices working properly. Input: PCI-E connector; output: 2 Ports USB3.0 Hub + 1 USB3.0 20 Pins Connector. Built-in over current protection protects devices that work effectively. Support USB 3.0 to Sata interface, USB 3.0 with high speed up to 5.0Gb/s, backward compatible with USB 2.0/1.1. With Internal Connector for USB3.0 Front IO device if USB 3.0 Motherboard is absent. With 2 x Hot-swappable USB 3.0 Port Notes: To ensure USB 3.0 transfer speed, highest quality USB 3.0 cables and devices are required