HP Z400 WORKSTATION SERVER, XEON CPU W3503 2.4GHz, 16 GB RAM, GEFORCE GTX 750, 2 | eBay
HP Z400 Workstation FL998U8 W3550 3.06GHz/ 8GB RAM/ 160GB HDD [Z400] - $395.00 : Professional Multi Monitor Workstations, Graphics Card Experts
4GB EUDIMM Memory for HP Z400 Workstation DDR3L-1600 - Newegg.com
Refurbished HP Z400 Workstation Intel® Xeon® Processor ...
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 Workstation Z400 Memory Upgrades @Memory.NET
HP Z400 Workstation (6 DIMM Slots) 4GB RAM Memory Upgrade
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
HP Z400 Workstation FM039UA Intel W3680 3.33GHz/6GB RAM/ 500GB [Z400] - $419.00 : Professional Multi Monitor Workstations, Graphics Card Experts