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SI-PEX40138 is a professional PCI-E X4 storage expansion controller card built with JMB585 chipset. It provides 4 independent SATA III 6Gbps ports and one M.2 B-Key 22x42 slot, supporting mainstream SATA hard drives, solid state drives and M.2 B-key SSD. Adopting non-RAID mode, no complicated settings required, simple installation and stable operation. Matched with low profile bracket, it can be used in full-height and small-size chassis perfectly. Widely applicable to desktop PC storage upgrade, home NAS, multimedia workstation and daily data storage expansion.