Teardown of new 21.5-inch iMac surprisingly reveals user-upgradable RAM, modular CPU - 9to5Mac
Apple iMac 21.5" Late 2013 Core i5 2.7GHz 8GB RAM 1TB HDD MacOS Big Sur 11.5.7 | eBay
A1286 8GB Memory (PC3-12800, DDR3 1600MHz) for Apple MacBook Pro 15 inch A1286 Mid 2012. Apple MacBook Pro 13 inch A1278 - Mid 2012. iMac 21.5 inch A1418 Late 2012, A1418 Early 2013, A1
Apple iMac 21.5-inch and 27-inch (Late 2013) reviews | Macworld
Apple iMac 2013 (Late) 21.5-inch (iMac 14,3) SSD ,Ram & OSX Upgrades - ZD Laptop Service Centre
$1,099 iMac review: Lose 50% of your performance to save 18% of the money | Ars Technica
Install memory in an iMac - Apple Support
2013 iMac teardowns reveal SSD slots, soldered-in CPU in the 21.5” model | Ars Technica
HOW I UPGRADED MY iMAC 21.5in Late 2013 MODEL (SSD & RAM UPGRADE) - YouTube
Timetec 32GB KIT(4x8GB) Compatible for Apple DDR3L 1600MHz PC3L-12800 CL11 for iMac (Mid 2011, Late 2012, Late 2013, Late 2014 Retina 5K, Mid 2015 Retina 5K) SODIMM Memory Module MAC RAM Upgrade at Amazon.com
Install memory in an iMac - Apple Support
SOLD - Late 2013 iMac 21.5" - $695 - Denver Mac Repair
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
Used Apple iMac 21.5-inch (Aluminum) 2.7GHZ Quad Core i5 (Late 2013) ME086LL/A - GainSaver