The HP ProDesk 400 G4 SFF caps at 32GB of DDR4-2400 in two SO-DIMM slots

The HP ProDesk 400 G4 SFF caps at 32GB of DDR4-2400 in two SO-DIMM slots

The ProDesk 400 G4 SFF sits at the more budget end of HP’s lineup, and its 32GB ceiling reflects that. Two SO-DIMM slots running DDR4-2400, non-ECC — fine for office productivity and light multitasking, but you’ll hit the ceiling fast if you’re running VMs or memory-heavy applications.