Late 2013 iMac review: Faster than before, but the gains over previous models are modest | Macworld
Memory Upgrades for iMac 27-Inch (2012 - Mid 2015)
iMac 27-Inch "Core i7" 3.5 Late 2013 Max RAM is higher than 32gb | MacRumors Forums
NEMIX RAM 32GB Kit (4x8GB Upgrade) DDR3-1600 SODIMM PC3-12800 for Apple MacBook Pro Mid 2012 / iMac Late 2012 / iMac 2013, Late 2014, Mid 2015, Mac Mini Late 2012 at Amazon.com
Timetec 32GB KIT(4x8GB) Compatible for Apple DDR3L 1600MHz PC3L-12800 CL11 for iMac (Mid 2011, Late 2012, Late 2013, Late 2014 Retina 5K, Mid 2015 Retina 5K) SODIMM Memory Module MAC RAM Upgrade at Amazon.com
How To: Apple Mac Pro RAM Upgrade! (Late 2013) - YouTube
2012 2013 2014 Apple Imac 5k 27 Inch Memory Ram 4gb 8gb 16gb 32gb Ddr3 1600 - Rams - AliExpress
Apple iMac 27-inch 3.2GHz Quad Core i5 32GB RAM 1TB HD NVIDIA 755M 1GB ,2013 | eBay