HP Z400 Workstation - 1 x Intel Xeon W3550 Quad-core (4 Core) 3.06 GHz - 3 GB DDR3 SDRAM - 500 GB HDD - 21.5" 1920 x 1080 Display 64-bit - Convertible Mini-tower - Jack Black, Alloy Metallic
HP Z400 RAM | Memory Upgrade– Cloud Ninjas
How to install 16GB of memory/ram into an HP Z400 Workstation - YouTube
Solved: Z400 RAM - Page 3 - HP Support Community - 6148900
HP Z400 Gaming Computer PC GeForce GTX 1060 256GB SSD 12GB RAM [Z400] - $825.00 : Professional Multi Monitor Workstations, Graphics Card Experts
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
HP Z400 RAM | Memory Upgrade– Cloud Ninjas
A-Tech 4GB for HP HP Z400 Workstation (6 DIMM Slots) (1 x 4GB) PC3-12800 (DDR3-1600) ECC Unbuffered UDIMM 240-Pin 1Rx8 1.35V Server Memory RAM at Amazon.com