HP Z400 Workstation MT Intel Xeon W3550 3.07GHz 8GB RAM No HDD No OS
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
8Gb (2X4Gb) Memory RAM Compatible with Hp Workstation Z400 Workstation Compatible with Server Only By CMS (B80) - Computer Memory Solutions
4GB 2X2GB RAM Memory for Compaq HP Z Series Workstations Z200 Workstation, Z210 CMT Workstation (Xeon E3, Core i3 and Intel Pentium processors), Z400 Workstation (4 DIMM Slots), Z400 Workstation (6 - Walmart.com