Apple iMac 21.5-Inch Core i5 (Late 2013) All in One Desktop PC - Core i5 (I5-4570R) 2.7GHz - 8GB RAM - 1 TB HDD - Intel Iris Pro 5200 1536MB Graphics - Full HD Display - macOS High Sierra
Memory upgrade: Apple iMac 2012/2013/2014 (Howto)
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
Imac 21.5 Inch Late 2013 Ram Upgrade Czech Republic, SAVE 41% - brandbola.com
A-Tech 8GB Kit (2x4GB) RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/Late 2013, Late 2014, Mid 2015), Mac Mini (Late 2012) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com
Install memory in an iMac - Apple Support
How to Upgrade iMac RAM: 2012-2022: EveryMac.com
How to Upgrade/Install Memory in a 21.5-inch iMac (Late 2012– Mid 2014) iMac14,1 iMac14,3 - YouTube
Apple iMac (21.5-inch, Late 2013) - Intel Core i5-4570R - 8GB RAM - 500GB SSD | Stone Refurb