Apple iMac Pro (2017)
Yes. 4 slots, up to 32 GB seen working.
It takes DDR4-2666 full-size sticks (DIMM). Most machines in the reports run ECC sticks. The slots sit inside the case, behind the display, so fitting memory means opening it up. Apple lists it as a service upgrade.
- Slots
- 4 DIMM slots
- Type
- DDR4-2666 288-pin DIMM
- Most seen working
- 32 GB in two or more machines; one machine runs 128 GB
- Firmware says
- 1024 GB maximum (often wrong, so we show what machines run)
- How sure
- 8 of 8 reports show this layout
Worked out from 8 hardware reports of this desktop, with Apple's memory specifications for which Macs have sockets. Sources and method. Updated 10 Nov 2026.
Questions
Can I upgrade the RAM in the Apple iMac Pro (2017)?
Yes. 4 slots, up to 32 GB seen working. It takes DDR4-2666 full-size sticks (DIMM). Most machines in the reports run ECC sticks. The slots sit inside the case, behind the display, so fitting memory means opening it up. Apple lists it as a service upgrade.
What type of RAM does the Apple iMac Pro (2017) use?
DDR4-2666 full-size sticks (DIMM, 288-pin).
How much RAM can the Apple iMac Pro (2017) take?
Machines in the reports run up to 32 GB, and one runs 128 GB. The firmware reports a maximum of 1024 GB, a figure that is often wrong.
Is this my desktop?
On the Mac, choose Apple menu > About This Mac > System Report. The Model Identifier should read iMacPro1,1.