Small PCIe to 19pin USB3.0 Expansion Card Function: Converts a PCIe slot into an internal USB 3.0 connection via the standard 19pin USB3.0 header, enabling convenient USB 3.0 access inside the PC. Controller and compatibility: Uses the uPD720202 controller and supports Windows XP, Windows Server 2003/2008, Windows 7/8/10/11, in both 32bit and 64bit editions. Power options: Requires a power supply via a small 15pin connector or a 4pin floppy drive style power connection. Installation note: Can only be used with PCIe standard slots. It must be plugged in to work when in use. Size and form: Small PCIe expansion card designed for internal USB 3.0 header connectivity. Why you need it: Adds USB 3.0 capability to systems that lack an internal USB 3.0 header, improving compatibility for USB 3.0 front panels, internal hubs, and speed peripherals. Distinguishing benefits: Reliable internal USB 3.0 expansion with broad OS support, leveraging a widely compatible uPD720202 controller for stable performance. Practical use scenarios: 1) Upgrading an older desktop by adding USB 3.0 support through the motherboard 19pin header. 2) Providing USB 3.0 access for frontpanel USB ports or internal USB hubs in a compact build. 3) Deploying in workstations or servers that require internal speed USB 3.0 connections for peripherals and data transfer tasks.