RAM for HP z440 ? - HP Support Community - 7583277
HP Z440 Series Turnkey Workstation with 16GB RAM B&H Photo Video
HP Z440 Workstation 4x4K Multi Monitors CPU 3.7GHz RAM 48GB SSD 512GB Win10 P600 [751489-006] - $859.00 : Professional Multi Monitor Workstations, Graphics Card Experts