TOOGOO(R) PCI Express to SuperSpeed USB 3.0 4 Port Card Adapter for Desktops with 5V 4 Pin Power Connector Plug & play super fast and high-capacity data transfer solution, stable and reliable VIA Chipset, 4 USB 3.0 downstream ports for standard desktop PCs. Compliant with USB 3.0 specification Revision 1.0, compatible with USB 2.0 & 1.1 specification. Compliant with Single-Lane (x1) PCI-Express throughput up to 5Gbps, supports 2.5Gbps PCI-E bus with full duplex channel. Compatible with Windows 2000, XP, Vista, 7, 8 (32bit/64bit). Win 8 needn't install the driver. Only support Win 8 that is officially released version. 4-pin power connector available for some high current consumption peripherals, like HDD. Bus-powered mode and no external power required for most of peripherals.