HP Z420 Workstation
Desktop, from 2012 64 hardware reports
Memory
Up to 128 GB
8 full-size slots
Drives and power
Coming next
Checked from separate sources
Upgradable
Yes. 8 slots, up to 128 GB seen working.
It takes DDR3-1600 full-size sticks (DIMM).
- Slots
- 8 DIMM slots
- Type
- DDR3-1600 240-pin DIMM
- Most seen working
- 128 GB in two or more machines
- Firmware says
- 256 GB maximum (often wrong, so we show what machines run)
- How sure
- 64 of 64 reports show this layout
See 16 GB DDR3-1600 DIMM on AmazonOpens an Amazon search for this exact spec.
Worked out from 64 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 Z420 Workstation?
Yes. 8 slots, up to 128 GB seen working. It takes DDR3-1600 full-size sticks (DIMM).
What type of RAM does the HP Z420 Workstation use?
DDR3-1600 full-size sticks (DIMM, 240-pin).
How much RAM can the HP Z420 Workstation take?
Machines in the reports run up to 128 GB. The firmware reports a maximum of 256 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 Z420 Workstation.