Fast HP Z400 Workstation, Xeon 2.4 GHz Dual Core, 4GB Ram, 160GB HDD, – RefurbishedPC
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HP Z400 48GB Memory/Ram Install - YouTube
Solved: Z400 RAM - Page 2 - HP Support Community - 6148900
24GB (6 x4GB) Memory DDR3 1333 PC3 10600 ECC for HP Workstation Z400 w 6 sockets - Newegg.com