HP Z4 G4 Workstation
Desktop, from 2018 13 hardware reports
Memory
Up to 128 GB
8 full-size slots
SSD
2+ M.2
At least 2 M.2 SSD slots
Drives and power
Coming next
Checked from separate sources
Upgradable
Yes. 8 slots, up to 128 GB seen working.
It takes DDR4-2666 full-size sticks (DIMM).
- Slots
- 8 DIMM slots
- Type
- DDR4-2666 288-pin DIMM
- Most seen working
- 128 GB in two or more machines
- Firmware says
- 3072 GB maximum (often wrong, so we show what machines run)
- SSD slots
- At least 2 M.2 SSD slots listed by the firmware
- How sure
- 13 of 13 reports show this layout
See 16 GB DDR4-2666 DIMM on AmazonOpens an Amazon search for this exact spec.
Worked out from 13 hardware reports of this desktop. Sources and method. Updated 9 Nov 2026.
8 full-size slots
Illustration Questions
Can I upgrade the RAM in the HP Z4 G4 Workstation?
Yes. 8 slots, up to 128 GB seen working. It takes DDR4-2666 full-size sticks (DIMM).
What type of RAM does the HP Z4 G4 Workstation use?
DDR4-2666 full-size sticks (DIMM, 288-pin).
How much RAM can the HP Z4 G4 Workstation take?
Machines in the reports run up to 128 GB. The firmware reports a maximum of 3072 GB, a figure that is often wrong.
Does the HP Z4 G4 Workstation have an M.2 SSD slot?
Yes. The firmware lists at least 2 M.2 SSD slots, in 13 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 Z4 G4 Workstation.