HP Z400 almost 48GB ram Upgrade + RamDisk Benchmarks - YouTube
Managed to get an old HP Z400 workstation for the equivalent of $75 USD. Xeon W3520, 6x2gb of ram and I replaced the Quadro FX580 with a GT 730 I had laying
Gaming on a Cheap Xeon: The HP Z400 Workstation - Boiling Steam
How to install 16GB of memory/ram into an HP Z400 Workstation - YouTube
Solved: Z400 RAM Upgrade from 8GB to 12GB or 16GB - HP Support Community - 6746942
16GB KIT (4 x 4GB) for HP-Compaq Z Workstation Series Z200 Z400 (4 DIMM Slots) Z400 (6 DIMM Slots). DIMM DDR3 ECC Registered PC3-10600E 1333MHz Dual Rank Server Ram Memory. Genuine A-Tech
4GB EUDIMM Memory for HP Z400 Workstation DDR3L-1600 - Newegg.com
Solved: Z400 X5690 W3690 Fastest Processors - HP Support Community - 5683601