Apple iMac (Retina 5K, 27-inch, 2020)
Model identifier iMac20,1 All-in-one, from 2020 2 hardware reports
Only 2 machines have reported their memory so far, so this answer rests on few examples. Check the label or open the panel before you buy.
Upgradable
Yes. 4 slots, up to 32 GB seen working.
It takes DDR4-2666 laptop-size sticks (SO-DIMM).
- Slots
- 4 SO-DIMM slots
- Type
- DDR4-2666 260-pin SO-DIMM
- Most seen working
- 32 GB; one machine runs 32 GB
- Firmware says
- 64 GB maximum
- How sure
- 2 of 2 reports show this layout
See 8 GB DDR4-2666 SO-DIMM on AmazonOpens an Amazon search for this exact spec.
Worked out from 2 hardware reports of this desktop, with Apple's memory specifications for which Macs have sockets. Sources and method. Updated 10 Nov 2026.
4 laptop-size slots
Illustration Questions
Can I upgrade the RAM in the Apple iMac (Retina 5K, 27-inch, 2020)?
Yes. 4 slots, up to 32 GB seen working. It takes DDR4-2666 laptop-size sticks (SO-DIMM).
What type of RAM does the Apple iMac (Retina 5K, 27-inch, 2020) use?
DDR4-2666 laptop-size sticks (SO-DIMM, 260-pin).
Is this my desktop?
On the Mac, choose Apple menu > About This Mac > System Report. The Model Identifier should read iMac20,1.
More in the Apple iMac
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