HP Z840 Workstation
Desktop, from 2015 21 hardware reports
Memory
Up to 256 GB
16 full-size slots
Drives and power
Coming next
Checked from separate sources
Upgradable
Yes. 16 slots, up to 256 GB seen working.
It takes DDR4-2133 full-size sticks (DIMM).
- Slots
- 16 DIMM slots
- Type
- DDR4-2133 288-pin DIMM
- Most seen working
- 256 GB in two or more machines; one machine runs 512 GB
- Firmware says
- 512 GB maximum (often wrong, so we show what machines run)
- How sure
- 21 of 21 reports show this layout
See 16 GB DDR4-2133 DIMM on AmazonOpens an Amazon search for this exact spec.
Worked out from 21 hardware reports of this desktop. Sources and method. Updated 9 Nov 2026.
16 full-size slots
Illustration Questions
Can I upgrade the RAM in the HP Z840 Workstation?
Yes. 16 slots, up to 256 GB seen working. It takes DDR4-2133 full-size sticks (DIMM).
What type of RAM does the HP Z840 Workstation use?
DDR4-2133 full-size sticks (DIMM, 288-pin).
How much RAM can the HP Z840 Workstation take?
Machines in the reports run up to 256 GB, and one runs 512 GB. The firmware reports a maximum of 512 GB, a figure that is often wrong.
Is this my desktop?
Check the model name on the front or the label of the case. It should read Z840 Workstation.