Features: This 4-port USB PCI-E board supports USB 3.0 which can provide fast data transmission speed and is powered by stable and secure PCI-E interface. The PCI-E to USB extender card features a PCI-E X1 bus interface, you can connect it with 4x, 8x, 16x graphics card interface. The PCI-E X1 to USB adapter is easy to use and can be used in many types of computer operating systems. The PCI-E to 4 USB Port Adapter can provide PCI-E USB, so you will have more ports to connect. Specifications: Bus interface: PCI-E x 1. (for 4x, 8x, 16x graphics card interface) Interface: USB PCI-E x 4 interface Size: approx. 120x67x57mm/4.72x2.64x2.24in Compatible System: Replacement for DOS, Replacement for Linux, Replacement for WinXP / Win7 / Win8 / Win10 Note: There may be color distortions due to different computer resolutions. There may be little errors due to different manual measurement. Package includes: 1 x USB 3.0 riser card