Used HP Additional 4GB 1866 MHz DDR3 ECC RAM Memory E2Q91AT B&H
HP Z400 Windows 10 Pro Workstation Computer PC Tower Intel Xeon Processor 16GB 1TB Dual Video Graphics and WIFI
Solved: Z400 RAM Upgrade from 8GB to 12GB or 16GB - HP Support Community - 6746942
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
HP Z400 Workstation FM067UT W3520 2.6GHz/ 6GB RAM/ 500GB/ FX1800 [Z400] - $369.00 : Professional Multi Monitor Workstations, Graphics Card Experts
4GB EUDIMM Memory for HP Z400 Workstation DDR3L-1600 - Newegg.com
24GB (6 x4GB) Memory DDR3 1333 PC3 10600 ECC for HP Workstation Z400 w 6 sockets - Newegg.com
2GB DDR3-1333 (PC3-10666) ECC RAM Memory Upgrade for The Compaq HP Workstation Z400 (Genuine A-Tech Brand) at Amazon.com
How to install 16GB of memory/ram into an HP Z400 Workstation - YouTube
Solved: Z400 RAM - Page 2 - HP Support Community - 6148900
Solved: Z400 RAM - Page 2 - HP Support Community - 6148900
32GB (4X8GB) DDR3 1333 Memory For HP Z400 Z420 Workstation | eBay