Description: PCI-E to USB 3.0 2 port PCI express expansion card 19-pin power connector with 1x USB 3.0 20-pin connector. PCI Express One step update your windows computer to USB3.0 easily with PCI Express to USB3.0 controller adapter card; 1 USB 3.0 20-pin connector (expand another two USB 3.0 ports). USB 3.0 supports transfer rates of up to 5 Gbps. Built-in with 4-pin IDE Power Connector for added power source to better support power hungry bus-powered devices. Compatibility: Works great with Windows XP 32/64, Windows 7 32/64, Windows8, Windows8.1, Windows10. Specification: Bus Mode: PCI-E x1 Compatible Slots: PCI-E x1 / x4 / x8 / x16 USB Interface: 2 USB3.0 Ports Transmission Rate: USB3.0, 5Gb / s Support Operating System: Windows XP 32/64, Windows 7 32/64, Windows8, Windows8.1, Windows10 Size:120*20*70mm Item Weight: 40g / 1.41oz Package Includes: 1 Piece PCI-E to USB3.0 Expansion Card 1 Set Screws Note: To achieve the maximum throughput, the PCI-Express slot must be version 2.0 or higher. Performance per port may decrease if multiple ports are transferring data simultaneously due to limited throughput of the PCI-Express slot. To meet USB 3.0 transfer speed, high quality USB 3.0 cables and devices are required. Supports both 32-bit & 64-bit OSes. Make sure the power is well connected; otherwise you will see a "Power Surge on Hub Port" message error and no 5V bus power in USB ports.