This Riser Card directly into the computer motherboard PCI Express 1x Bus and provides the extension on PCI-e 16x Socket. Best Riser for 1x, 2x, 4x, 8x or 16x PCI-e Host Card working at 2.5Gbps PCI-e 1x Motherboard slot. For more details on product, Please refer to http://www.papyrus.co.il/pci-e_1x_bus_to_16x_socket_extension_card.htm