iMac with Retina 5K Display 2014/2015 Memory Upgrades
Apple iMac (21.5-inch, 2014) review: A price cut for the 21-inch iMac makes it a mainstream machine - CNET
iMac (Retina 5K, 27-inch, Late 2014) - Technical Specifications
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
Apple iMac 2014 (Late) 27-inch (Retina 5K) SSD ,Ram & OSX Upgrades - ZD Laptop Service Centre
Apple iMac with 5K Retina display (27-inch) review: Apple's 5K iMac impresses expert eyes (review) - CNET
21.5" iMac Mid-2014 1TB SATA SSD Upgrade – UKSL MacLab
Retina iMac 2014: Five Features We Want to See | Digital Trends