Dell OptiPlex 3040
Desktop, from 2015 41 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 16 GB
2 full-size slots
Memory
Up to 16 GB
2 laptop-size slots
SSD
1+ M.2
At least 1 M.2 SSD slot
Drives and power
Coming next
Checked from separate sources
Upgradable
Yes. 2 slots, up to 16 GB seen working.
It takes DDR3-1600 full-size sticks (DIMM).
- Slots
- 2 DIMM slots
- Type
- DDR3-1600 240-pin DIMM
- Most seen working
- 16 GB in two or more machines
- Firmware says
- 16 GB maximum
- SSD slots
- At least 1 M.2 SSD slot listed by the firmware
- How sure
- 24 of 41 reports show this layout
See 8 GB DDR3-1600 DIMM on AmazonOpens an Amazon search for this exact spec.
Worked out from 41 hardware reports of this desktop. Sources and method. Updated 9 Nov 2026.
2 full-size slots
Illustration Upgradable
Yes. 2 slots, up to 16 GB seen working.
It takes DDR3-1600 laptop-size sticks (SO-DIMM).
- Slots
- 2 SO-DIMM slots
- Type
- DDR3-1600 204-pin SO-DIMM
- Most seen working
- 16 GB
- How sure
- 17 of 41 reports show this layout
See 8 GB DDR3-1600 SO-DIMM on AmazonOpens an Amazon search for this exact spec.
Worked out from 41 hardware reports of this desktop. Sources and method. Updated 9 Nov 2026.
2 laptop-size slots
Illustration Questions
Can I upgrade the RAM in the Dell OptiPlex 3040?
Yes. 2 slots, up to 16 GB seen working. It takes DDR3-1600 full-size sticks (DIMM).
What type of RAM does the Dell OptiPlex 3040 use?
DDR3-1600 full-size sticks (DIMM, 240-pin).
How much RAM can the Dell OptiPlex 3040 take?
Machines in the reports run up to 16 GB. That matches the 16 GB maximum the firmware reports.
Does the Dell OptiPlex 3040 have an M.2 SSD slot?
Yes. The firmware lists at least 1 M.2 SSD slot, in 17 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 OptiPlex 3040.