iMac memory specifications

Learn about the types of random access memory (RAM) and video memory (VRAM) 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, 2017) 64GB 2400MHz DDR4 4GB or 8GB GDDR5 SDRAM 5
iMac (Retina 4K, 21.5-inch, 2017) 32GB None 2400MHz DDR4 2GB or 4GB GDDR5 SDRAM 3
iMac (21.5-inch, 2017) 16GB None 2133MHz DDR4 Intel Iris Plus Graphics 640 3

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

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

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

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

6

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

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

4

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

6

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

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

4

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

3

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

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

2

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

2

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

512MB GDDR3 SDRAM and
1GB GDDR5 SDRAM

2

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

2

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

2

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

Learn more

Learn about integrated video on Intel-based Macs

Get more information about memory and specific iMac models:

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