21.5" iMac Has No User-Upgradable RAM; 27" Has Four Accessible RAM Slots - MacRumors
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
iMac Intel 21.5" EMC 2544 Repair - iFixit
27" iMac (Late 2012) 32GB RAM Upgrade (How To & Guide) - YouTube
Install memory in an iMac - Apple Support
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
Install memory in an iMac - Apple Support
How to Upgrade/Install Memory in a 21.5-inch iMac (Late 2012– Mid 2014) iMac14,1 iMac14,3 - YouTube
Install memory in an iMac - Apple Support
The Case of the Late-2012 iMacs - MacStories
How to Upgrade RAM in a 27" iMac (2012) - YouTube
Timetec 16GB KIT(2x8GB) Compatible for Apple DDR3L 1600MHz for Mac Book Pro(Early/Late 2011,Mid 2012), iMac(Mid 2011,Late 2012,Early/Late 2013,Late 2014,Mid 2015), Mac Mini(Mid 2011,Late 2012) MAC RAM at Amazon.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
How To Upgrade RAM in a Mac | Macworld
Memory upgrade: Apple iMac 2012/2013/2014 (Howto)
iMac Intel 27" EMC 2546 RAM Replacement - iFixit Repair Guide
iMac RAM for Model 13.2 to 15.1| DDR3-1600MHz | 8GBx4 | MacMemory.com
Apple's 2012 iMac: Ready for its close-up (pictures) - CNET
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
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
2012 21.5-Inch Apple iMac Review: Slim, Sleek, And Stylish, But Far From Shallow | TechCrunch
iFixit iMac teardown reveals dual mics, difficult RAM upgrades and glued LCD - 9to5Mac
Harder, better, faster, stronger: A review of the 27-inch iMac | Ars Technica
Restored Apple iMac 21.5" All-in-One Computer, Intel Core i5, 8GB RAM, 1TB HD, macOS 10.15 Catalina, Silver, MD093LL/A (Refurbished) - Walmart.com
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 (Late 2012) review (21.5- and 27-inch) | Macworld
