Description: This PCI-E 1 to 4 riser board provides 4 USB ports, so you can connect with 4 PCI-E riser boards. The PCI-E to USB adapter card is compatible with many kinds of computer systems, replacement for windows XP/7/8/10 The PCI-E to USB expansion card comes with USB 3.0 cables that are flexible, you can connect it with 1U, 2U, 3U chassis. The PCI-E riser card adapter is designed with a PCI-E 1X interface and is convenient to connect and be powered. The PCI-E expansion card has solid capacitors to provide a stable power supply for stable performance and safe for operation. Specifications: USB cable length: 60cm. Support OS: Replacement for DOS, replacement for Linux, replacement for Windows XP/7/8/10. Interface: PCI-E 1x, USB. Note: There might be a bit color distortions due to different computer resolutions. There might be a slight errors due to different hand measurement. Due to replacement for Window limit the number of graphics cards, in replacement for WIN10 can only recognize up to 8 graphics cards, replacement for WIN7 can only recognize 6 graphics cards, and to use the revised graphics card driver, on one motherboard please use with the same type of graphics card. 8 graphics cards or more quantity please to use replacement for LINUX system. Package included: 1x PCI-E 1 to 4 riser card. 4x PCI-E 16x Adapter. 4x PCI-E 1X riser board. 4x USB 3.0 cable. 4x power cable.(ONLY the "4pin and 6pin connector" riser comes with the power cable, the "SATA Connector" riser not come with the power cable)