Excellent Compatibility-This extension PCIE riser adapter card is compatible with DOS LINUX WINXP WIN7 WIN8 WIN10 ect. Great Extendability-Plug the 4 in 1 PCI-E X1 slot riser card (compatible with X4, X8, X16/graphics interface) can be expanded 4 PCIE USB 3.0 ports. Easy Installation- No extra power cable needed, can be fixed to the case, it's easy and convenient to settle and install. Excellent Heat dissipation- With the deep sink aluminum IC heat radiator, cool down the temperature of the pci-e riser card in high efficiency and ensure the work performance. What You Get -1 Pcs PCIe 1 to 4 PCIE USB 3.0 Riser Card (4 in 1). Please allow 1-3mm error due to manual measurement and make sure you do not mind before ordering.