Which RAM is compatible with my iMac?

It is not always easy to find out which RAM is compatible with your iMac, but with the table found below, we have made things easier for you.
With the table, you can find the right kind of RAM for your iMac, based on the “Model Identifier” or “Model Description”.

You can find the iMac “Model Identifier” or “Model Description” by clicking the Apple logo in the top-left corner and then “About this Mac”.
This pop-up screen displays the “Model Description”, for the “Model Identifier” please click “System Report…”.
For users of older versions of Mac OS X, it may be necessary to click the button at the bottom of the pop-screen to select ‘More Info...’ before the
“Model Description” of your Mac is displayed.

 

Model description Model identifier Maximum RAM Available kits
iMac Retina 5K 27" 2020 iMac20.1 or iMac20.2 128GB 2x16GB / 2x32GB
iMac Retina 5K 27" 2019 iMac19.1 128GB 2x16GB / 2x32GB
iMac Retina 5K 27" 2017 iMac18.3 64GB 2x8GB / 2x16GB
iMac Retina 4K 21.5" 2017 iMac18.2 32GB Instruction page
iMac 21.5" Mid 2017 iMac18.1 32GB Instruction page
iMac Retina 5K 27" Late 2015 iMac17.1 64GB 2x8GB / 2x16GB
iMac 21.5" Late 2015 iMac16.1 16GB (Not expandable) -
iMac Retina 4K 21.5" Late 2015 iMac16.2 16GB (Not expandable) -
iMac Retina 5K 27" Mid 2015 iMac15.1 32GB 2x4GB / 2x8GB
iMac Retina 5K 27" Late 2014 iMac15.1 32GB 2x4GB / 2x8GB
iMac 21.5" Mid 2014 iMac14.4 8GB (Not expandable) -
iMac 27" Late 2013 iMac14.2 32GB 2x4GB / 2x8GB
iMac 21.5" Late 2013 iMac14.1 or iMac 14.3 16GB Instruction page
iMac 21.5" Early 2013 iMac13.1 16GB Instruction page
iMac 27" Late 2012 iMac13.2 32GB 2x4GB / 2x8GB
iMac 21.5" Late 2012 iMac13.1 16GB Instruction page
iMac 21.5" Late 2011 iMac12.1 16GB 2x4GB
iMac 27" Mid 2011 iMac12.2 32GB 2x4GB / 2x8GB
iMac 21.5" Mid 2011 iMac12.1 32GB 2x4GB / 2x8GB
iMac 27" Mid 2010 (i5 en i7 iMac11.3 32GB 2x4GB / 2x8GB
iMac 27" Mid 2010 (i3) iMac11.3 16GB 2x4GB
iMac 21.5" Mid 2010 iMac11.2 16GB 2x4GB
iMac 27" Late 2009 (i5 en i7) iMac11.1 32GB 2x4GB / 2x8GB
iMac 27" Late 2009 (Core 2 Duo) iMac10.1 16GB 2x4GB
iMac 21.5" Late 2009 iMac10.1 16GB 2x4GB
iMac 20" Mid 2009 iMac9.1 8GB 2x4GB
iMac 24" Early 2009 iMac9.1 8GB 2x4GB
iMac 20" Early 2009 iMac9.1 8GB 2x4GB
iMac 24" Early 2008 iMac8.1 6GB 2x2GB / 4GB
iMac 20" Early 2008 iMac8.1 6GB 2x2GB / 4GB
iMac 24" Mid 2007 iMac7.1 6GB 2x2GB / 4GB
iMac 20" Mid 2007 iMac7.1 6GB 2x2GB / 4GB