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Apple iMac (21.5-inch, 2014) review: A price cut for the 21-inch iMac makes it a mainstream machine - CNET
Install memory in an iMac - Apple Support
Teardown of New 4K 21.5-inch iMac Reveals Removable RAM and Modular CPU - MacRumors
Apple iMac 21.5" Desktop Core i5-4260U 1.4GHz 8GB RAM 500GB HDD Mac OS Mid- 2014 w/ Keyboard & Mouse
iMac with Retina 5K Display 2014/2015 Memory Upgrades
Install memory in an iMac - Apple Support
NEMIX RAM 16GB Kit (2x8GB Upgrade) DDR3-1600 SODIMM PC3-12800 for Apple MacBook Pro Mid 2012 / iMac Late 2012 / iMac 2013, Late 2014, Mid 2015, Mac Mini Late 2012 at Amazon.com
Apple iMac 21.5" - Mid 2014 Reviews, Pros and Cons | TechSpot
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
iMac with Retina 5K Display 2014/2015 Memory Upgrades