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The PU21 Dual U.2 to PCIe 4.0 X8 adapter card is professionally designed for high-speed U.2 NVMe SSD storage expansion. It provides dual U.2 SFF-8639 interfaces to connect two U.2 NVMe SSDs at the same time. This adapter has no onboard PCIe bifurcation function, it must work with a motherboard that supports PCIe bifurcation to recognize both U.2 drives normally. Users can set up software RAID for U.2 SSDs through system OS tools to improve read-write speed and data security. Supporting PCIe 4.0 full-speed bandwidth and downward compatible with PCIe 3.0, it fits most mainstream Intel and AMD motherboards. Stable circuit layout and anti-interference design ensure long-term stable operation under heavy load. Perfect for DIY PC storage upgrade, NAS construction, workstation and entry server high-speed storage expansion scenarios.