HP Z400 almost 48GB ram Upgrade + RamDisk Benchmarks - YouTube
Solved: Z400 RAM - Page 2 - HP Support Community - 6148900
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
Solved: Z400 RAM - Page 2 - HP Support Community - 6148900