Differences Between Late 2012 and Late 2013 Aluminum iMac: EveryMac.com
Install memory in an iMac - Apple Support
Install memory in an iMac - Apple Support
Amazon.com: Apple iMac 21.5in 2.7GHz Core i5 (ME086LL/A) All In One Desktop, 8GB Memory, 256GB Solid State Drive, MacOS 10.12 Sierra (Renewed) : Electronics
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
iMac | 3.2 GHz Core i5 | 27 Inch | Late 2013 - Techable.com
late 2013 imac proccesor upgrade help | MacRumors Forums
Apple iMac 21.5-inch ME086LL/A Late 2013 - 16GB RAM - 1TB HDD - 2.7GHz i5-4570R - Silver (Scratch and Dent) - Walmart.com
HOW I UPGRADED MY iMAC 21.5in Late 2013 MODEL (SSD & RAM UPGRADE) - YouTube
How to upgrade RAM iMac late 2013 21.5inch - break & fix MOVIE - YouTube
New iMac Teardown
Apple iMac 21.5" Late 2013 - Core i5 2.9GHz 8GB RAM 1TB HDD