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
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
Solved: Z400 Aftermarket Upgrades - Page 5 - HP Support Community - 5691838