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This PH46-2 expansion card is designed to expand your system storage via PCIe slot. It comes with dual SFF8639 U.2 interfaces for NVMe solid state drives and an extra port for 2.5" SATA hard drives or SSDs. Built with PCIe 4.0 X8 specification, it maintains excellent transmission performance and works well with PCIe 3.0 devices. The X4X4 bifurcation function allows independent operation of two U.2 drives, meeting high-speed storage demands for servers and workstations. Premium gold-plated pins effectively reduce signal loss and enhance connection reliability. It is plug and play, no extra driver needed, and widely compatible with most mainstream storage devices and operating systems for convenient daily use.