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708615-001 Z420 Workstation LGA-2011 ATX System Board
619557-001 HP Z420 WorkStation Mini Tower System Board
Z420 motherboard connections - HP Support Community - 7914217
Does HP Z420 compatible with SATA M.2 or NVMe M.2 ssd? - HP Support Community - 7914320
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Solved: Upgrade amount of SATA in Z420 - HP Support Community - 6322348
HP Z420 E5-1620 V2 Quad Core 3.7Ghz 8GB 500GB Dual DVI No OS