Apple iMac (Retina 4K, 21.5-inch, Late 2015)
Model identifier iMac16,2 All-in-one, from 2015 44 hardware reports
Not upgradable
No. The memory is soldered to the board.
8 or 16 GB is built in and there is no slot to add more.
- Free slots
- None
- Type
- DDR3-1866
- Soldered
- 8 GB or 16 GB, depending on the configuration
- Firmware says
- 8 GB maximum (often wrong, so we show what machines run)
- How sure
- 23 of 23 reports show this layout
Worked out from 23 hardware reports of this desktop, with Apple's memory specifications for which Macs have sockets. Sources and method. Updated 10 Nov 2026.
All soldered
Illustration Questions
Can I upgrade the RAM in the Apple iMac (Retina 4K, 21.5-inch, Late 2015)?
No. The memory is soldered to the board. 8 or 16 GB is built in and there is no slot to add more.
What type of RAM does the Apple iMac (Retina 4K, 21.5-inch, Late 2015) use?
DDR3-1866 memory soldered to the board.
Is this my desktop?
On the Mac, choose Apple menu > About This Mac > System Report. The Model Identifier should read iMac16,2.
More in the Apple iMac
- iMac (21.5-inch, Mid 2011) (iMac12,1)
- iMac (27-inch, Mid 2011) (iMac12,2)
- iMac (20-inch and 24-inch, Mid 2007) (iMac7,1)
- iMac (20-inch and 24-inch, Early 2008) (iMac8,1)
- iMac (21.5-inch and 27-inch, Late 2009) (iMac10,1)
- iMac (20-inch and 24-inch, Early and Mid 2009) (iMac9,1)
- iMac (27-inch, Late 2013) (iMac14,2)
- iMac (21.5-inch, Late 2013) (iMac14,1)
- iMac (Retina 5K, 27-inch, 2017) (iMac18,3)
- iMac (21.5-inch, Mid 2010) (iMac11,2)
- iMac (Retina 4K, 21.5-inch, 2017) (iMac18,2)
- iMac (27-inch, Mid 2010) (iMac11,3)