The Startech PCI Express 3.0 card model 77-53923 is an expansion component designed to add two USB 3.2 Gen 1 ports (formerly USB 3.0) to any computer with an available PCIe slot, allowing data transfer speeds of up to 5 Gbps. This black card with compact dimensions of 18 mm wide, 82 mm deep, and 120 mm high fits both standard and low-profile systems thanks to the included brackets, thus expanding compatibility across different-sized setups. It is equipped with a high-quality Renesas/NEC integrated circuit (model µPD720202) that ensures stability and performance in USB connections. The card provides an advanced solution for connecting external devices via SATA and USB 3.2 interfaces, significantly improving port management compared to conventional cards. Additionally, it includes an LP4 connector for extra power, delivering up to 900 mA per port, which is especially useful for devices requiring more power, exceeding the standard 500 mA of USB 2.0. A key feature is its support for the UASP protocol (USB Attached SCSI Protocol), which optimizes performance in simultaneous data transfers, increasing read speeds by 70% and write speeds by 40% on compatible systems, while reducing system resource usage by 80%. This feature is compatible with operating systems such as Windows 8, Server 2012, and Linux kernel 2.6.3 or higher, ensuring broad coverage for professional and home users. The card maintains backward compatibility with USB 2.0 and 1.1 devices, allowing versatile integration with various equipment and peripherals. With CE and FCC certification, it meets international quality and safety standards, representing a reliable option to expand USB connectivity via a PCIe 3.0 interface that offers high speed and efficient data transmission. In summary, this Startech controller card is a solid technical solution for those looking to add fast, reliable USB ports to their system with advanced management and power capabilities, ideal for users needing improved performance and functionality of their USB connections in Windows or Linux environments.