OWC Memory Upgrades For 27" iMac with Retina 5K Display (Late 2015) - ynzal.com
Install memory in an iMac - Apple Support
Install memory in an iMac - Apple Support
Timetec 32 GB Kit (4 x 8 GB) Compatible con Apple iMac Finales de 2015 (27 Pulgadas con Pantalla Retina 5K) DDR3L 1867 MHz/1866 MHz PC3L-14900 2Rx8 CL13 1,35 V 204 Pines SODIMM Mac RAM : Amazon.es: Informática
Can you upgrade the RAM in the 27-inch iMac? | iMore
Upgrade RAM on Apple Retina iMac 5K (Late 2015) / How To install memory - YouTube