Dell OptiPlex 7040
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
Worked out from 83 hardware reports of this desktop. Sources and method. Updated 10 Nov 2026.
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
Worked out from 83 hardware reports of this desktop. Sources and method. Updated 10 Nov 2026.
Yes. It takes an NVMe M.2 SSD.
The slot runs at PCIe 3.0 x4, up to about 3.9 GB/s. A faster PCIe 4.0 drive works too, at that speed. M.2 drives come in 2230, 2242 and 2280 lengths (30, 42 and 80 mm). Check the length printed on your current drive before you order. It also takes 2.5-inch SATA drives.
- Drive type
- NVMe (PCIe) and SATA
- Slot speed
- PCIe 3.0 x4, from 21 machines
- M.2 slots
- At least 1
- Length
- Check your current drive
- How sure
- NVMe drive in 47 of 92 machines
From 92 PCI device reports and the firmware's slot table. Sources and method. Updated 10 Nov 2026.
Illustration Check the label on the power supply.
We don't have this model's power supply rating. It is printed on the supply's sticker, inside the case next to its fan. Prebuilt desktops often use a supply shaped for their case, so match the shape and the plugs as well as the watts.
- Rating
- On the supply's label
How to read a power supply label. Sources and method. Updated 10 Nov 2026.
Illustration Processors seen in these desktops.
Processors in the reports: Core i7-6700 (30), Core i5-6500 (24), Core i5-6500T (12), Core i5-6600 (8), Core i3-6100T (3), Core i7-6700T (3). Prebuilt desktops often only take processors from the generation they shipped with, so stay with the ones listed.
- Seen working
- Core i7-6700, Core i5-6500, Core i5-6500T
- How sure
- From 83 reports
From the processor records in 83 hardware reports. Sources and method. Updated 10 Nov 2026.
Illustration People run graphics cards in this desktop.
Cards in the reports: Radeon HD 8670 / R7 250/350 (18), Radeon HD 8670 / R5 340X OEM / R7 250/350/350X OEM (6), FirePro V3900 (3), GeForce GT 1030 (3), GeForce GTX 745 (3), GeForce GT 730 (2).
- Seen working
- Radeon HD 8670 / R7 250/350, Radeon HD 8670 / R5 340X OEM / R7 250/350/350X OEM, FirePro V3900
From 170 PCI device reports. Sources and method. Updated 10 Nov 2026.
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.
What SSD does the Dell OptiPlex 7040 take?
Yes. It takes an NVMe M.2 SSD. The slot runs at PCIe 3.0 x4, up to about 3.9 GB/s. A faster PCIe 4.0 drive works too, at that speed. M.2 drives come in 2230, 2242 and 2280 lengths (30, 42 and 80 mm). Check the length printed on your current drive before you order. It also takes 2.5-inch SATA drives.
What processor can I put in the Dell OptiPlex 7040?
Processors seen in these desktops. Processors in the reports: Core i7-6700 (30), Core i5-6500 (24), Core i5-6500T (12), Core i5-6600 (8), Core i3-6100T (3), Core i7-6700T (3). Prebuilt desktops often only take processors from the generation they shipped with, so stay with the ones listed.
Can I add a graphics card to the Dell OptiPlex 7040?
People run graphics cards in this desktop. Cards in the reports: Radeon HD 8670 / R7 250/350 (18), Radeon HD 8670 / R5 340X OEM / R7 250/350/350X OEM (6), FirePro V3900 (3), GeForce GT 1030 (3), GeForce GTX 745 (3), GeForce GT 730 (2).
Is this my desktop?
Check the model name on the front or the label of the case. It should read OptiPlex 7040.