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Install memory in an iMac - Apple Support
Late 2013 iMac review: Faster than before, but the gains over previous models are modest | Macworld
How to Upgrade Memory in a 27-inch iMac (Late 2012-2013) iMac13,2 and iMac14,2 - YouTube
Memory Upgrades for iMac 27-Inch (2012 - Mid 2015)
iMac | 3.2 GHz Core i5 | 27 Inch | Late 2013 - Techable.com
A-Tech 8GB RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/Late 2013, Late 2014, Mid 2015), Mac Mini (Late 2012) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com