How do I upgrade my mid 2014 21.5 iMac? - iMac Intel 21.5" EMC 2805 - iFixit
A-Tech 16GB Kit (4x4GB) RAM for Apple iMac (Late 2012, Late 2013, Late 2014, Mid 2015) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com
Apple 21.5-inch iMac review | 2014 | Digital Trends
Adamanta 16GB (2x8GB) Apple Memory Upgrade DDR3L 1600MHz SODIMM Compatible for iMac (Mid 2011, Late 2012, Early/Late 2013, Late 2014, Mid 2015), MacBook Pro (Early/Late 2011, Mid 2012), Mac Mini RAM at Amazon.com
iMac (Intel-based) - Wikipedia
Apple iMac 21.5-Inch (2014) Review | PCMag
Configure your own 21.5-inch Apple iMac (2014) at OWC