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New 21.5-inch iMac least repairable yet due to lack of RAM, hard drive upgradability - 9to5Mac
How to Upgrade/Install Memory in a 21.5-inch iMac (Late 2012– Mid 2014) iMac14,1 iMac14,3 - YouTube
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21in 4K Retina iMac (2015) review | Macworld
Install memory in an iMac - Apple Support
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iMac RAM Upgrade 8GB-32GB (Late 2015) - YouTube
iMac Intel 21.5" Retina 4K Display Teardown - iFixit
OWC Tears Down iMac Retina 4K, Confirms Memory Is Soldered
Install memory in an iMac - Apple Support
Install memory in an iMac - Apple Support
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Install memory in an iMac - Apple Support
64GB RAM upgrade kit for 21.5-inch iMAC now offered by OWC - 9to5Mac
Apple iMac 21.5-Inch 2.8GHz Core i5 (Late 2015) MK442LL/A – E-Volve Computer
Teardown of New 4K 21.5-inch iMac Reveals Removable RAM and Modular CPU - MacRumors
![Apple iMac 21.5" Late 2015 Retina 4K Intel i5-5675R @ 3.1GHz 8GB RAM 500GB SSD | eBay](https://i.ebayimg.com/images/g/jFkAAOSw9RNkxZKj/s-l1600.jpg "Apple iMac 21.5" Late 2015 Retina 4K Intel i5-5675R @ 3.1GHz 8GB RAM 500GB SSD | eBay")