Sunshine-tipway 2-port USB 3.0 Pci-e Express Card with 4-pin Power Connector for Desktops + 5.25 Inch 2 Port Usb 3.0 Front Panel Compliant with USB 3.0 Super-Speed (5Gbps), USB 2.0 Hi-Speed (480Mbps), USB 1.1 Low-Speed (1.5Mbps) Built-in 4-pin power connector for receiving extra power supply from system Hot-swapping feature allows you to connect/disconnect devices without powering down the system Big 4pin power connector + USB3.0 20pin, suitable interface pci-e 1X, pci-e 4X, pci-e 8X, pci-e 16X Compliant with PCI Express Base Specification 2.0