iMac memory specifications

Learn about the types of random access memory (RAM) and video memory (VRAM) that are used in iMac computers.

Learn how to identify your iMac, then find it below.

iMac Model Max. DRAM User-
Installable
Slot
AASP-
Installable
Slot
Video/
VRAM
Notes
iMac (Retina 5K, 27-inch, 2019) 64 GB 2666MHz DDR4 4 GB or 8 GB GDDR5 SDRAM 5
iMac (Retina 4K, 21.5-inch, 2019) 32 GB None 2666MHz DDR4 (for i5 processor)
2400MHz DDR4 (for i3 processor)
2 GB, 4 GB or 8 GB GDDR5 SDRAM 3
iMac (Retina 5K, 27-inch, 2017) 64 GB 2400MHz DDR4 4 GB or 8 GB GDDR5 SDRAM 5
iMac (Retina 4K, 21.5-inch, 2017) 32 GB None 2400MHz DDR4 2 GB or 4 GB GDDR5 SDRAM 3
iMac (21.5-inch, 2017) 16 GB None 2133MHz DDR4 Intel Iris Plus Graphics 640 3

iMac (Retina 5K, 27-inch, Late 2015)

32 GB 1867MHz DDR3 2 GB or 4 GB GDDR5 SDRAM 4
iMac (Retina 4K, 21.5-inch, Late 2015) 16 GB None Intel Iris Pro Graphics 6200 6
iMac (21.5-inch, Late 2015) 16 GB None Intel Iris Pro Graphics 6000 6
iMac (Retina 5k, 27-inch, Mid 2015) 32 GB 1600MHz DDR3 2 GB GDDR5 SDRAM 4

iMac (Retina 5K, 27-inch, Late 2014)

32 GB 1600MHz DDR3 2 GB or 4 GB GDDR5 SDRAM 4
iMac (21.5-inch, Mid 2014) 16 GB None Intel HD Graphics 5000

6

iMac (27-inch, Late 2013) 32 GB PC3-12800
(1600) DDR3
204-pin
SO-DIMM

1 GB GDDR5 SDRAM,
2 GB GDDR5 SDRAM and 4 GB GDDR5 SDRAM 

4

iMac (21.5-inch, Late 2013) 16 GB None PC3-12800
(1600) DDR3
204-pin
SO-DIMM
Intel HD Graphics 4000

6

iMac (27-inch, Late 2012) 32 GB PC3-12800
(1600) DDR3
204-pin
SO-DIMM

512 MB GDDR5 SDRAM,
1 GB GDDR5 SDRAM and 2 GB GDDR5 SDRAM 

4

iMac (21.5-inch, Late 2012) 16 GB None PC3-12800
(1600) DDR3
204-pin
SO-DIMM
 512 MB GDDR5 SDRAM

3

iMac (27-inch, Mid 2011) 16 GB PC3-10600
(1333) DDR3
204-pin
SO-DIMM

512 MB GDDR5 SDRAM and
1 GB GDDR5 SDRAM and 2 GB GDDR5 SDRAM 

2

iMac (21.5-inch, Mid 2011) 16 GB PC3-10600
(1333) DDR3
204-pin
SO-DIMM
512 MB GDDR5 SDRAM

2

iMac (27-inch, Mid 2010) 16 GB PC3-10600
(1333) DDR3
204-pin
SO-DIMM

512 MB GDDR3 SDRAM and
1 GB GDDR5 SDRAM

2

iMac (21.5-inch, Mid 2010) 16 GB PC3-10600
(1333) DDR3
204-pin
SO-DIMM
256 MB up to 512 MB GDDR3 SDRAM

2

iMac (Late 2009) 16 GB PC3-8500
(1066) DDR3
204-pin
SO-DIMM
256 MB up to 512 MB GDDR3 SDRAM

2

iMac (Mid 2009) 4 GB PC3-8500
(1066) DDR3
204-pin
SO-DIMM
256 MB up to 512 MB GDDR3 SDRAM  
iMac (Early 2009) 8 GB PC3-8500
(1066) DDR3
204-pin
SO-DIMM
256 MB up to 512 MB GDDR3 SDRAM  
iMac (Early 2008) 4 GB PC2-6400
(800) DDR2
200-pin
SO-DIMM
128 MB or 256 MB GDDR3 SDRAM  
iMac (Mid 2007) 4 GB PC2-5300
(667) DDR2
200-pin
SO-DIMM
128 MB or 256 MB GDDR3 SDRAM  
iMac (Late 2006) 4 GB PC2-5300
(667) DDR2
200-pin
SO-DIMM
128 MB GDDR3 SDRAM 1
iMac (Mid 2006) and iMac (17-inch Late 2006 CD) 2 GB PC2-5300
(667) DDR2
200-pin
SO-DIMM
64 MB GDDR3 SDRAM  
iMac (Early 2006) 2 GB PC2-5300
(667) DDR2
200-pin
SO-DIMM
128 MB GDDR3 SDRAM  
  1. Although iMac (Late 2006) accepts up to a 2 GB SO-DIMM in each of its two memory slots, the computer only supports 3 GB memory in total.
  2. iMac (Late 2009), iMac (Mid 2010), and iMac (Mid 2011) have four SDRAM slots, each of which can accept a 2 GB or 4 GB SO-DIMM.
  3. These iMac models have no user-installable SDRAM slots. An Apple Authorised Service Provider (AASP) can install SDRAM in these computers.
  4. 27-inch iMac models introduced in 2012 through 2015 have four SDRAM slots, each of which can accept a 4 GB or 8GB SO-DIMM.
  5. 27-inch iMac models introduced in 2017 and 2019 have four SDRAM slots, each of which can accept a 4 GB, 8 GB or 16 GB SO-DIMM.
  6. Learn more about integrated video on Intel-based Macs.
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