HP Pro Mini 400 G9 Desktop PC
Mini PC, from 2023 2 hardware reports
Memory
Up to 32 GB
2 laptop-size slots
SSD
1+ M.2
At least 1 M.2 SSD slot
Drives and power
Coming next
Checked from separate sources
Only 2 machines reported so far, so this answer rests on few examples. Check the label or open the panel before you buy.
Upgradable
Yes. 2 slots, up to 32 GB seen working.
It takes DDR4-3200 laptop-size sticks (SO-DIMM).
- Slots
- 2 SO-DIMM slots
- Type
- DDR4-3200 260-pin SO-DIMM
- Most seen working
- 32 GB; one machine runs 32 GB
- Firmware says
- 64 GB maximum
- SSD slots
- At least 1 M.2 SSD slot listed by the firmware
- How sure
- 2 of 2 reports show this layout
See 16 GB DDR4-3200 SO-DIMM on AmazonOpens an Amazon search for this exact spec.
Worked out from 2 hardware reports of this desktop. Sources and method. Updated 9 Nov 2026.
2 laptop-size slots
Illustration Questions
Can I upgrade the RAM in the HP Pro Mini 400 G9 Desktop PC?
Yes. 2 slots, up to 32 GB seen working. It takes DDR4-3200 laptop-size sticks (SO-DIMM).
What type of RAM does the HP Pro Mini 400 G9 Desktop PC use?
DDR4-3200 laptop-size sticks (SO-DIMM, 260-pin).
Does the HP Pro Mini 400 G9 Desktop PC have an M.2 SSD slot?
Yes. The firmware lists at least 1 M.2 SSD slot, in 2 reports. Some firmware leaves a slot out, so there may be more.
Is this my desktop?
Check the model name on the front or the label of the case. It should read Pro Mini 400 G9 Desktop PC.