Dell Precision 5820 Tower X-Series
Desktop, from 2019 10 hardware reports
Memory
Up to 128 GB
8 full-size slots
Drives and power
Coming next
Checked from separate sources
Upgradable
Yes. 8 slots, up to 128 GB seen working.
It takes DDR4-2666 full-size sticks (DIMM).
- Slots
- 8 DIMM slots
- Type
- DDR4-2666 288-pin DIMM
- Most seen working
- 128 GB in two or more machines
- Firmware says
- 3072 GB maximum (often wrong, so we show what machines run)
- How sure
- 10 of 10 reports show this layout
See 16 GB DDR4-2666 DIMM on AmazonOpens an Amazon search for this exact spec.
Worked out from 10 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 Dell Precision 5820 Tower X-Series?
Yes. 8 slots, up to 128 GB seen working. It takes DDR4-2666 full-size sticks (DIMM).
What type of RAM does the Dell Precision 5820 Tower X-Series use?
DDR4-2666 full-size sticks (DIMM, 288-pin).
How much RAM can the Dell Precision 5820 Tower X-Series take?
Machines in the reports run up to 128 GB. The firmware reports a maximum of 3072 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 5820 Tower X-Series.