3 x Nanya 12GB (3x4GB) PC3-8500R DDR3 RDIMM SERVER Memory RAM NT4GC72B4NA1NL-BE | eBay
CMS 12GB (3X4GB) DDR3 10600 1333MHZ ECC Non Registered DIMM Memory Ram Upgrade Compatible with HP/Compaq® Workstation Z200, Z210, Z400, Z600, Z800 for Server Only - B81 at Amazon.com