Dell OptiPlex 7040
Desktop, from 2015 83 hardware reports
Which case is yours? The two cases take different memory. A micro or mini case is the size of a hardback book and runs from a laptop-style power brick.
Memory
Up to 64 GB
4 full-size slots
Memory
Up to 32 GB
2 laptop-size slots
SSD, drives and power
Coming next
Checked from separate sources
Upgradable
Yes. 4 slots, up to 64 GB seen working.
It takes DDR4-2133 full-size sticks (DIMM).
- Slots
- 4 DIMM slots
- Type
- DDR4-2133 288-pin DIMM
- Most seen working
- 64 GB in two or more machines
- Firmware says
- 64 GB maximum
- How sure
- 62 of 83 reports show this layout
See 16 GB DDR4-2133 DIMM on AmazonOpens an Amazon search for this exact spec.
From 83 reports of this machine in the Linux Hardware Database (CC BY 4.0). Updated 9 Nov 2026.
4 full-size slots
Illustration Upgradable
Yes. 2 slots, up to 32 GB seen working.
It takes DDR4-2133 laptop-size sticks (SO-DIMM).
- Slots
- 2 SO-DIMM slots
- Type
- DDR4-2133 260-pin SO-DIMM
- Most seen working
- 32 GB
- How sure
- 21 of 83 reports show this layout
See 16 GB DDR4-2133 SO-DIMM on AmazonOpens an Amazon search for this exact spec.
From 83 reports of this machine in the Linux Hardware Database (CC BY 4.0). Updated 9 Nov 2026.
2 laptop-size slots
Illustration Questions
Can I upgrade the RAM in the Dell OptiPlex 7040?
Yes. 4 slots, up to 64 GB seen working. It takes DDR4-2133 full-size sticks (DIMM).
What type of RAM does the Dell OptiPlex 7040 use?
DDR4-2133 full-size sticks (DIMM, 288-pin).
How much RAM can the Dell OptiPlex 7040 take?
Machines in the reports run up to 64 GB. That matches the 64 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 OptiPlex 7040.