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
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
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
Quickspecs HP Z400 Workstation
32GB (4X8GB) DDR3 1333 Memory For HP Z400 Z420 Workstation | eBay
Refurbished HP Z400 Workstation Intel® Xeon® Processor ...
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