Kingston ValueRAM 8GB Kit (2x4GB) 1333MHz DDR3 Non-ECC CL9 DIMM SR x8 Desktop Memory KVR13N9S8K2/8 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