16GB KIT (4 x 4GB) for HP-Compaq Z Workstation Series Z200 Z400 (4 DIMM Slots) Z400 (6 DIMM Slots). DIMM DDR3 ECC Registered PC3-10600E 1333MHz Dual Rank Server Ram Memory. Genuine A-Tech
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HP Z400 Workstation FL998U8 W3550 3.06GHz/ 8GB RAM/ 160GB HDD [Z400] - $395.00 : Professional Multi Monitor Workstations, Graphics Card Experts
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4GB PC3-12800 DDR3 ECC UDIMM Server Memory RAM for HP Z400 Workstation 6 DIMM | eBay