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27-inch iMac with Retina 5K Display, 2017 (iMac 18,3) DDR4- 2400Mhz

Apple's latest 27-inch iMac with Retina 5K Display was released June 2017. The system maximum is 64GB by installing (4) 16GB Ram modules

Up to 64GB of Memory


27-inch iMac with Retina 5K Display, Late 2015-2016 (iMac17,1)
DDR3-1867Mhz

Apple's latest 27-inch iMac with Retina 5K Display was released in October 2015-2016.The system maximum is 64GB

Up to 64GB of Memory

                  
iMac Memory for Model 13.2 14.2 and 15.1

iMac Late 2012, Late 2013, Late 2014, and Retina 5K
DDR3-1600Mhz

The 27" Late 2012 through Late 2014 iMacs, including the iMac 5K Retina Display, utilize DDR3-1600Mhz memory. The system maximum is 32GB (4X8GB)

Up to 32GB of Memory

             
iMac Memory for Models 11.3 (with i5 and i7) 12.1 and 12.2

iMac Mid 2010 and Mid 2011
DDR3-1333Mhz

The iMac 11,3 with i5 or i7 processor has a maximum of 32GB (4x8GB)

Up to 32GB of Memory

iMac Memory Models 11.2 and 11.3 (with i3)

iMac Mid 2010
DDR3-1333Mhz

The iMac Model 11,2 has a system maximum of 16GB (4x4GB.) The iMac 11,3 running the i3 processor also has a maximum memory of 16GB....

Up to 16GB of Memory

iMac Memory for Model 11.1

iMac Late 2009 (Core i5 and i7)
DDR3-1067Mhz

The DDR3-1067Mhz iMac Model ID 11,1 has four slots. Each slot can take a 8GB SO-DIMM for a maximum of 32GB...

Up to 32GB of Memory

iMac Memory for Model 10.1

iMac Late 2009 (Core 2 Duo)
DDR3-1067Mhz

The DDR3-1067Mhz iMac Model ID 10,1 has four slots. Each slot can take a 4GB SO-DIMM module for a maximum of 16GB.

Up to 16GB of Memory

iMac Memory for Model 9.1

iMac Early 2009 and Mid 2009
DDR3-1067Mhz

The DDR3-1067Mhz based iMac Intel has 2 slots with a memory maximum of 8GB.

Up to 8GB of Memory

iMac Memory for Model 8.1

iMac Early 2008
DDR2-800Mhz

The iMac 8,1 utilizes DDR2-800Mhz memory and has a system maximum of 6GB memory with the installation of one 2GB module and one 4GB module.

Up to 6GB of Memory

iMac Memory for Model 7.1

iMac Mid 2007
DDR2-667Mhz

The iMac Model 7,1 takes DDR-667Mhz RAM and has a system maximum of 6GB with the installation of one 2GB module and one 4GB.

Up to 6GB of Memory

iMac Memory for Models 5.1 and 6.1

iMac Late 2006
DDR2-667Mhz

The iMac 5,1 and 6,1 can have a system maximum of 4GB of memory installed, but only 3GB will be fully addressed. Installing 4GB of...

iMac Memory for Models 4.1 4.2 and 5.2

iMac Early 2006, Mid 2006, and Late 2006CD
DDR2-667Mhz

The iMac Model IDs 4,1 4,2 and 5,2 have a system maximum of 2GB of memory.