HP ProDesk 400 G4 SFF

What type of RAM does the HP ProDesk 400 G4 SFF support, and what is the maximum capacity?

It supports DDR4-2400 MHz non-ECC unbuffered DIMMs. The maximum capacity is 32 GB (2 x 16 GB) across two SO-DIMM slots.

How many storage drive bays and SATA ports are available?

It has one 2.5-inch internal drive bay and one 3.5-inch internal drive bay. There are two SATA 6 Gb/s ports on the motherboard.

Does the HP ProDesk 400 G4 SFF support M.2 NVMe SSDs?

Yes, it has one M.2 2280 slot that supports both SATA and PCIe NVMe SSDs.

Which CPUs are compatible with this model?

It supports Intel 8th generation (Coffee Lake) desktop processors, including Core i3, i5, and i7 models, using the LGA 1151 socket. It does not support 9th generation CPUs.

Can the power supply be upgraded?

The standard power supply is a 180W or 250W unit (depending on configuration), and it is proprietary to HP. Replacement must be an identical HP part; standard ATX power supplies are not compatible due to the small form factor design.

Is the graphics card upgradeable?

Yes, it has one low-profile PCIe x16 slot, but the SFF chassis limits card height. Only low-profile, single-slot graphics cards will fit, and power is limited to 75W from the slot.

What other upgradeable components are accessible?

The system has one PCIe x1 slot for expansion cards (e.g., Wi-Fi, USB). The CPU cooler is replaceable, but only with low-profile coolers due to chassis height constraints.