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Solved: Z400 RAM - Page 2 - HP Support Community - 6148900
16GB KIT (4 x 4GB) for HP-Compaq Z Workstation Series Z200 Z400 (4 DIMM Slots)
HP Z400 Workstation SF604UP W3550 2.40GHz/ 3GB RAM/ 160GB HDD [Z400] - $369.00 : Professional Multi Monitor Workstations, Graphics Card Experts
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Solved: Z400 RAM - Page 2 - HP Support Community - 6148900
CMS 12GB (3X4GB) DDR3 10600 1333MHZ ECC Non Registered DIMM Memory Ram Upgrade Compatible with HP/Compaq® Workstation Z200, Z210, Z400, Z600, Z800 for Server Only - B81 at Amazon.com
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Arch Memory Replacement for HP A2Z50AA 8GB 240-Pin DDR3 1600 MHz ECC UDIMM RAM for Z400 Z420 Z620 Z820 at Amazon.com