Apple iMac with 4K Retina display (21.5-inch, 2015) review: Apple packs more pixels into its smallest iMac - CNET
iMac Intel 21.5" EMC 2889 Teardown - iFixit
Apple iMac 21.5” SSD Upgrade (2013-2015) HDD To Solid State Drive (SATA) | Step By Step - YouTube
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
Reemplazo de Memoria RAM iMac Intel 27" 5K Retina - Guía de reparación iFixit
iMac RAM Upgrade 8GB-32GB (Late 2015) - YouTube
Install memory in an iMac - Apple Support
Install memory in an iMac - Apple Support
Actualización de RAM y Disco duro SATA de Mac Intel 21.5" Retina 4K Display (2017) - Guía de reparación iFixit
Apple iMac review (21.5-inch, 2015): 4K is optional, faster hard drives shouldn't be | Engadget
Finales de 2015 Apple iMac con Intel Core i5 de 3,1 GHz (21,5 pulgadas, 16 GB de RAM, disco duro de 1 TB) Plata (Reacondicionado) : Amazon.es: Informática