parts-quick 8GB Memory for HP Z440 Workstation DDR4 PC4-17000 2133 MHz RDIMM Compatible RAM at Amazon.com
RAM Update in Workstatino Z440 do not work - HP Support Community - 6881802
A-Tech 64GB Kit (2 x 32GB) for HP Z440 Workstation - DDR4 PC4-21300 2666Mhz ECC Registered RDIMM 2Rx4 - Server Memory Ram Equivalent to OEM 850881-001 840758-091 815100-B21 (AT378360SRV-X2R4) at Amazon.com
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
parts-quick 32GB Compatible Memory for HP Z440 Workstation DDR4 PC4-17000 2133 MHz LRDIMM RAM at Amazon.com
HP Z440 Mini Tower Workstation Xeon E5-1620 v3 3.50GHz CPU 8GB DDR4 RAM *No HDD | eBay