Apple's 27" iMac Late 2012 model. How to upgrade the ram to 16GB - YouTube
21.5" iMac (2012) Teardown - YouTube
CMS 32GB (4X8GB) DDR3 12800 1600MHz Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac Core I7 3.4 27-Inch (Late 2012) - A6 at Amazon.com
Install memory in an iMac - Apple Support
How to Upgrade iMac RAM: 2012-2022: EveryMac.com
iMac (Late 2012) | Low End Mac
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
The Case of the Late-2012 iMacs - MacStories
How to Upgrade/Install Memory in a 21.5-inch iMac (Late 2012– Mid 2014) iMac14,1 iMac14,3 - YouTube
What Does It Take To Upgrade a 2012 iMac 21.5"?
iMac RAM for Model 13.2 to 15.1| DDR3-1600MHz | 8GBx2 | MacMemory.com
Apple iMac "Core i5" 2.7 21.5-Inch (Late 2012), 1 TB HD, 8GB RAM, OS 10.11.6 - Imagine41