12GB KIT (6 x 2GB) for HP-Compaq Z Workstation Series Z400 (6 DIMM Slots). DIMM DDR3 ECC Unbuffered PC3-10600E 1333MHz Server Ram Memory. Genuine A-Tech Brand. at Amazon.com
Quickspecs HP Z400 Workstation
HP Z400 Workstation Memory/RAM & SSD Upgrades | Kingston
HP Z400 Workstation MT Intel Xeon W3550 3.07GHz 8GB RAM No HDD No OS | eBay
Solved: Z400 Aftermarket Upgrades - Page 5 - HP Support Community - 5691838
HP Z400 Gaming PC Xeon W3550 3.06 GHz - 16GB Ram - 1TB Hard drive - WIFI - 750 ti 2GB DDR5 Graphic card 3 Games Installed: Buy Online at Best Prices in Pakistan | Daraz.pk
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Solved: Z400 RAM Upgrade from 8GB to 12GB or 16GB - HP Support Community - 6746942
This is my HP Z400, upgraded with a Xeon X5690. 12gb of ram, 2x500gb SSD, 2x250gb HDD, GTX 960 (the gpu is totally overkill lol). This is my first server! Running pterodactyl
HP-Z400 - HP Z400 Workstation Dual Core XEON W3503 2.4GHZ 2GB RAM Hard Drive 250GB / DVD+RW