2port USB 3.1 PCIE Expansion Card Function: Expands your computer with two USB 3.1 ports via a PCIe slot for additional speed USB connectivity. Bus type: PCI Express X1 3.0, compatible with PCIe x4/x8/x16 slots. Product name: 2port USB 3.1 PCIE Expansion Card. Compatibility: Compatible with Windows 7/8/8.1/10/11 and Linux OS. Why you need it: Adds two USB 3.1 ports to desktops that lack sufficient speed USB options, enabling faster data transfer for external drives and other USB devices without using motherboard USB headers. Key attributes: supports PCIe based installations, provides two USB 3.1 ports, broad OS compatibility. Use scenarios: Upgrading an older desktop to connect fast external storage or USB peripherals with USB 3.1 performance. Expanding USB availability on a workstation or gaming PC that has limited motherboard USB ports. Adding speed USB ports to a small form factor or HTPC where PCIe slots are available but space is constrained.