Dell Precision 3640 Tower
Desktop, from 2020 6 hardware reports
Memory
Up to 16 GB
4 full-size slots
Drives and power
Coming next
Checked from separate sources
Upgradable
Yes. 4 slots, up to 16 GB seen working.
It takes DDR4-2666 full-size sticks (DIMM).
- Slots
- 4 DIMM slots
- Type
- DDR4-2666 288-pin DIMM
- Most seen working
- 16 GB in two or more machines; one machine runs 128 GB
- Firmware says
- 128 GB maximum (often wrong, so we show what machines run)
- How sure
- 6 of 6 reports show this layout
See 4 GB DDR4-2666 DIMM on AmazonOpens an Amazon search for this exact spec.
Worked out from 6 hardware reports of this desktop. Sources and method. Updated 9 Nov 2026.
4 full-size slots
Illustration Questions
Can I upgrade the RAM in the Dell Precision 3640 Tower?
Yes. 4 slots, up to 16 GB seen working. It takes DDR4-2666 full-size sticks (DIMM).
What type of RAM does the Dell Precision 3640 Tower use?
DDR4-2666 full-size sticks (DIMM, 288-pin).
How much RAM can the Dell Precision 3640 Tower take?
Machines in the reports run up to 16 GB, and one runs 128 GB. The firmware reports a maximum of 128 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 Precision 3640 Tower.