21.5" iMac Has No User-Upgradable RAM; 27" Has Four Accessible RAM Slots - MacRumors
iMac Intel 21.5" EMC 2638 Teardown - iFixit
Late 2013 iMac review: Faster than before, but the gains over previous models are modest | Macworld
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
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
A-Tech 32GB Kit (4x8GB) RAM for Apple iMac (Late 2012, Late 2013, Late 2014, Mid 2015) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
HOW I UPGRADED MY iMAC 21.5in Late 2013 MODEL (SSD & RAM UPGRADE) - YouTube
How to upgrade RAM iMac late 2013 21.5inch - break & fix MOVIE - YouTube
New CPUs, faster Wi-Fi, same flaws: Apple's 2013 iMac reviewed | Ars Technica
Apple Classifies Early 2013 21.5-inch iMac as Obsolete - MacRumors
16GB KIT 2X 8GB for Apple iMac 2.7GHz 21.5" Late 2013 2.93GHz 27" Late
Apple's New 21.5 Inch iMac Has Upgradeable Parts — That's a Huge Deal
16GB Memory Upgrade Kit for 2012-2013 iMac 21.5-Inch
16GB KIT 2X 8GB for Apple iMac 2.7GHz 21.5" Late 2013 2.93GHz 27" Late
Install memory in an iMac - Apple Support
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
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
Apple's new 'Assembled in USA' iMac a bear to upgrade, repair • The Register
The Display - 21.5-inch iMac (Late 2013) Review: Iris Pro Driving an Accurate Display
How to Upgrade iMac Hard Drive or SSD 2012-2022: EveryMac.com
Install memory in an iMac - Apple Support
How to Upgrade iMac RAM: 2012-2022: EveryMac.com
