Adamanta 128GB (8x16GB) Server Memory Upgrade Compatible for HP Z440 Workstation DDR4 2133MHz PC4-17000 ECC Registered Chip 2Rx4 CL15 1.2v DRAM RAM at Amazon.com
HP Z440 Series Turnkey Workstation with 32GB RAM and 15-in-1
parts-quick 8GB Memory for HP Z440 Workstation DDR4 PC4-17000 2133 MHz RDIMM Compatible RAM at Amazon.com