16GB (2X8GB) Memory Ram Compatible with Apple iMac Core I5 3.4 27-Inch (Late 2013) Me089Ll/A by CMS A7 at Amazon.com
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
Apple iMac 2012 (Late) 21.5-inch (iMac 13,1) SSD ,Ram & OSX Upgrades - ZD Laptop Service Centre
21.5" iMac (2012) Teardown - YouTube
Can you upgrade the RAM in the 27-inch iMac? | iMore
Install memory in an iMac - Apple Support
How to upgrade iMac (2020) RAM and save up to $2000 - 9to5Mac
Memory Upgrades for iMac 27-Inch (2012 - Mid 2015)
A-Tech 16GB (2x8GB) PC3-12800 DDR3 1600MHz RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/Late 2013, Late 2014, Mid 2015), Mac Mini (Late 2012) | 204-Pin SODIMM Memory Upgrade Kit at Amazon.com
Apple iMac 27-inch (Late 2012) - Review 2012 - PCMag UK