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PA21 dual M.2 NVMe adapter converts two M.2 M-Key NVMe SSDs to PCIe 4.0 X8 interface. It supports all common M.2 SSD sizes from 2230 up to 22110. Designed without built-in bifurcation module, it needs a motherboard that supports PCIe bifurcation to recognize and run both SSDs normally. Compliant with PCIe 4.0 protocol, it maintains high-speed and stable data transmission. Compact structure and simple mounting make it a great choice for multi-NVMe storage expansion, DIY hardware upgrade and idle SSD reuse.