Review: 21.5-inch 2012 iMac takes two steps forward, one step back | Ars Technica
2012 21.5-Inch Apple iMac Review: Slim, Sleek, And Stylish, But Far From Shallow | TechCrunch
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
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
New 21-Inch iMac Won't Let Users Upgrade RAM Themselves, But 27-Inch iMac Will | Cult of Mac
Install memory in an iMac - Apple Support
Refurbished Apple 21.5" iMac (2012), 2.7GHz Quad Core Intel Core i5, 8GB RAM, 1TB HDD, Built in Webcam, Model - MD093LL/A, Grade A - Walmart.com
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013