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
Memory Upgrades for iMac w/ Retina 5K Display Late 2015
Apple 21.5" iMac with Retina 4K Display (Late 2015) MK452LL/A
How-To: Boost your Mac's speed and prolong its useful life with easy RAM upgrades - 9to5Mac
Can you upgrade the RAM in the 27-inch iMac? | iMore
The New 2017 iMac: Notes & Tidbits on RAM - The Mac Observer
Adamanta 32GB (4x8GB) Apple Memory Upgrade Compatible with Late 2015 iMac 27" Retina 5K Display DDR3/DDR3L 1867Mhz PC3L-14900 SODIMM 2Rx8 CL13 1.35v RAM DRAM : Electronics
memory - RAM freezes and crashes my iMac after upgrade to iMac late 2015 - Ask Different
OWC 8GB RAM Kit (2x4GB) iMac Late 2012 tot Mid 2015 - 4mac
Install memory in an iMac - Apple Support
Install memory in an iMac - Apple Support
How to replace the RAM in the 27-inch iMac | iMore