parts-quick 16GB Memory for HP Z440 Workstation DDR4 PC4-17000 2133 MHz RDIMM RAM at Amazon.com
16GB Memory for HP Z440 Workstation DDR4 PC4-17000 2133 MHz RDIMM RAM (MemoryMasters) at Amazon.com
8GB Memory for HP Workstation Z440, Z640, Z840 DDR4 PC4-17000 ECC RDIMM RAM | eBay
HP Z440 Xeon E5-1620 v3 3.5GHz RAM 32GB SSD 256GB Quadro M5000 Win 10 [HP- Z440] - $1,020.00 : Professional Multi Monitor Workstations, Graphics Card Experts
HP Z440 Workstation 4x4K Multi Monitors CPU 3.5GHz RAM 32GB SSD 512GB Win10 P600 [751489-006] - $819.00 : Professional Multi Monitor Workstations, Graphics Card Experts
Used HP Z440 Workstation Memory Modules Cooling Fan Assembly 752561-001 C3598WH 748799-001 - Walmart.com