RAM & Memory Upgrades
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
DDR3L 1600MHz PC3L-12800 204-Pin Unbuffered Non ECC 1.35V CL11 Dual Rank 2Rx8 based 512x8 Compatible for Apple iMac – 21.5 inch / 27 inch Mid 2011, 27 inch Late 2012, 27 inch Late 2013, 27 inch Late 2014, 27 inch Mid 2015- iMac12,1 iMac12,2 iMac13,2...
https://www.bizrate.co.uk/ram_memoryupgrades/timetec-32gb-kit-4x8gb-compatible-for-oid19085305192.html