Solved: Z400 RAM Upgrade from 8GB to 12GB or 16GB - HP Support Community - 6746942
HP Z400 Workstation Xeon W3503 2.4GHz 6GB 320GB DVDRW Quadro NVS 295 Linux | eBay
HP Z400 48GB Memory/Ram Install - YouTube
Solved: Z400 Aftermarket Upgrades - Page 5 - HP Support Community - 5691838
A-Tech 24GB ECC Unbuffered Memory Kit (6 x 4GB) for HP Z400 Workstation - ECC UDIMM DDR3 PC3-10600 1333MHz 240-Pin DIMM 2Rx8 1.5V Dual Rank RAM (AM080899) at Amazon.com
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Z400 Workstation 15GB RAM GTX 1660 | Jawa
Infomac Sales & Service - CPU HP Z400 Workstation (Second hand) - SOLD Price : RM700 Windows 7 Professional 64 bit Intel Xeon CPU W3550 @3.07Ghz RAM 8 GB Hard Disk 500
12GB KIT (6 x 2GB) for HP-Compaq Z Workstation Series Z400 (6 DIMM Slots). DIMM DDR3 ECC Unbuffered PC3-10600E 1333MHz Server Ram Memory. Genuine A-Tech Brand. at Amazon.com