Dell OptiPlex 745
Desktop, from 2006 55 hardware reports
Memory
Up to 8 GB
4 full-size slots
Drives and power
Coming next
Checked from separate sources
6 of 55 machines sold under this name show 2 slots instead of 4. That is usually the smaller case. Count the slots inside yours before you buy.
Upgradable
Yes. 4 slots, up to 8 GB seen working.
It takes DDR-667 full-size sticks (DIMM).
- Slots
- 4 DIMM slots
- Type
- DDR-667 DIMM
- Most seen working
- 8 GB in two or more machines
- Firmware says
- 8 GB maximum
- How sure
- 49 of 55 reports show this layout
See 8 GB DDR-667 DIMM on AmazonOpens an Amazon search for this exact spec.
Worked out from 55 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 OptiPlex 745?
Yes. 4 slots, up to 8 GB seen working. It takes DDR-667 full-size sticks (DIMM).
What type of RAM does the Dell OptiPlex 745 use?
DDR-667 full-size sticks (DIMM).
How much RAM can the Dell OptiPlex 745 take?
Machines in the reports run up to 8 GB. That matches the 8 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 745.