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This dual NVMe PCIe 4.0 expansion card provides flexible interface expansion. It turns a single PCIe X16 slot into two M.2 M-Key slots and one extra PCIe X16 port with x8 signal. It works with various mainstream sizes of M.2 NVMe SSDs. Please note that your motherboard needs to enable PCIe bifurcation to make all ports work properly. It is an ideal expansion accessory for desktops and workstations to expand storage and peripheral interfaces.