1PCI E 1 to 4: The interface is PCI E X1, compatible with X4, X8, X16 graphics interfaces, 1 interface can be expanded to 4 USB3.0 ports 2NOTE: The adapter card cannot be connected to USB devices, because the 4 USB ports transmit PCI E signals instead of USB signals 3PLUG in DESIGN: The PCI E riser card adopts a plug in design and is directly connected to the motherboard interface for power supply. Can be fixed on the chassis without extension cords, reducing the number of adapters and jumpers 4STRONG STABILITY: The main control board uses the PCI E interface for direct power supply, no external power cord is required, 4 USB 3.0 ports can work at the same time, and backward compatible with USB 2.0 and USB 1.0 5WIDE COMPATIBILITY: The total interface supports PCIE X1/X4/X8/X16 graphics card interface. The interface supports USB3.0 and is downward compatible with USB 2.0/1.0. Support for Dos, for Linux, for Win XP, for Win7, for Win8, for Win10 and other systems Item Type: PCIe 1 to 4 Riser Card Material: PCB, Aluminum Alloy Colour: Blue USB3.0 Gold Plated Interface: 4 Large Aluminum Alloy Heat Sink: Yes Compatibility: Compatible with X4, X8, X16 Slots. Support 10 Series and Below Graphics Cards. for Dos, for Linux, for Win XP, for Win7, for Win 8, for Win10 and Other Systems 1 x PCIe 1 to 4 Riser Card