HP Z440 Workstation with Intel Xeon E5-1630 v3 3.70GHz Quad Core Processor, 4GB DDR4 Memory, 2TB Hard Drive, AMD FirePro V5900, and Windows 10 Professional 64-bit Installed (Refurbished) - Walmart.com
Genuine HP Z440 Z800 Z820 Z840 2-5" to 3-5" Hard Drive Caddy 668261-002 - Notebookparts.com
Hp z440 6th Generation 16gb Ram/1TB HDD/4Gb Graphics – guava store
HP Z440, Z640, and Z840 Workstation Series Maintenance and Service Guide