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The ATTO ExpressSAS H12F0 GT is a low-profile PCIe 4.0 x8 host bus adapter for 12 Gb/s SAS/SATA storage connectivity. It provides 16 external SAS lanes through four SFF-8644 Mini-SAS HD connectors for attaching compatible external storage. Designed for installation in a compatible workstation or server PCIe slot. Match the adapter driver, host operating system, cables and attached devices to the intended configuration. Covered by a 3-year warranty.