APPLE IMAC LATE 2012 27 INCH A1419 i5 2.9GHz QUAD CORE 16 GB RAM 1TB HD CATALINA | eBay
Install memory in an iMac - Apple Support
Memory RAM 1x 4GB Apple iMac Late 2012 DDR3 1600MHz SO-DIMM | E-OWC1600DDR3S4GB | APPLE \ MEMORY FOR APPLE \ OWC \ APPLE IMAC \ iMac Late 2012 \ iMac 27'' (Late
Memory Upgrades for iMac 27-Inch (2012 - Mid 2015)
Harder, better, faster, stronger: A review of the 27-inch iMac | Ars Technica
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
OWC 8GB RAM Kit (2x4GB) iMac Late 2012 tot Mid 2015 - 4mac