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What Does It Take To Upgrade a 2012 iMac 21.5"?
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Apple iMac 21.5-Inch (Late 2012) Review | PCMag
The Case of the Late-2012 iMacs - MacStories
Review: 21.5-inch 2012 iMac takes two steps forward, one step back | Ars Technica
A-Tech 32GB Kit (4x8GB) RAM for Apple iMac (Late 2012, Late 2013, Late 2014, Mid 2015) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com
Apple iMac (Late 2012) review (21.5- and 27-inch) | Macworld
Apple iMac A1418 21.5" AiO Computer i5-3330S (Late-2012) -
Apple iMac 21.5” Late 2012 (A1418) Intel Core i7 3.1 Ghz 16 GB 1TB HDD | eBay