HP Z640 Workstation
Desktop, from 2016 20 hardware reports
Memory
Up to 256 GB
8 full-size slots
Drives and power
Coming next
Checked from separate sources
9 of 20 machines sold under this name show 4 slots instead of 8. That is usually the smaller case. Count the slots inside yours before you buy.
Depends on the configuration
It depends on the configuration.
The reports show more than one memory layout for this desktop. Check the label or the system information before you buy.
- Slots
- 8 DIMM slots
- Type
- DDR4-2133 288-pin DIMM
- Most seen working
- 256 GB in two or more machines
- Firmware says
- 256 GB maximum
- How sure
- 11 of 20 reports show this layout
See 32 GB DDR4-2133 DIMM on AmazonOpens an Amazon search for this exact spec.
Worked out from 20 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 Z640 Workstation?
It depends on the configuration: the reports show more than one memory layout for this desktop.
What type of RAM does the HP Z640 Workstation use?
DDR4-2133 full-size sticks (DIMM, 288-pin).
How much RAM can the HP Z640 Workstation take?
Machines in the reports run up to 256 GB. That matches the 256 GB maximum the firmware reports.
Is this my desktop?
Check the model name on the front or the label of the case. It should read Z640 Workstation.