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
Refurbished HP Z400 Workstation Intel® Xeon® Processor ...
HP Z400 Workstation (6 DIMM Slots) 4GB RAM Memory Upgrade
HP Z400 Intel Xeon QUAD Core W3520@2.67GHz 8GB RAM 500GB HD Workstation PC Win10 | eBay
HP Z400 WORKSTATION SERVER, XEON CPU W3503 2.4GHz, 16 GB RAM, GEFORCE GTX 750, 2 | eBay
Hp Z400 586968-001 Motherboard+Intel Xeon Slbv2 Cpu + 6Gb Ram – ZOMBIE COMPONENTS