HP Z440 Workstation – A. B. Computer Systems, Inc.
A-Tech 16GB Kit (2 x 8GB) for HP Z440 Workstation - DDR4 PC4-21300 2666Mhz ECC Registered RDIMM 1Rx8 - Server Specific Memory Ram (AT378360SRV-X2R5) at Amazon.com
Silent HP Z440 workstation: replacing noisy fans (2021) - Michael Stapelberg