8GB Kit [2x4GB] 1RAM Memory Upgrade for Compaq HP Workstation Z400 | eBay
A2Z50AA Certified Memory for HP Z400 Z420 Z620 Z820 8GB DDR3 ECC Unbuffered RAM | eBay
Upgrading an hp z400 (six slots) - HP Support Community - 7156445
CMS 8GB (2X4GB) DDR3 10600 1333MHZ ECC Non Registered DIMM Memory Ram Upgrade Compatible with HP/Compaq® Workstation Z400 Workstation for Server Only - B80 at Amazon.com
4GB RAM Memory Upgrade for HP Workstation Z400 PC3-10600E DDR3 1333MHz 2Rx8 ECC Unbuffered UB DIMM Module (PARTS-QUICK Brand) at Amazon.com
Solved: Z400 RAM - HP Support Community - 6148900
Solved: Z400 Aftermarket Upgrades - Page 5 - HP Support Community - 5691838
HP Z400 Workstation - Memory | HP® Customer Support
HP Z400 4GB Memory Kit (2 x 2GB) 1Rx8 PC3-10600E ECC RAM 637458-571 | eBay
16GB KIT (4 x 4GB) for HP-Compaq Z Workstation Series Z200 Z400 (4 DIMM Slots)
HP Z400 CPU upgrade - Page 2 - HP Support Community - 5048908
4GB PC3-12800 DDR3 ECC UDIMM Server Memory RAM for HP Z400 Workstation 4 DIMM | eBay
Refurbished HP Z400 Workstation Intel® Xeon® Processor ...
4GB EUDIMM Memory for HP Z400 Workstation DDR3L-1600 - Newegg.com