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Teardown of new 21.5-inch iMac surprisingly reveals user-upgradable RAM, modular CPU - 9to5Mac
How to Upgrade iMac RAM: 2012-2022: EveryMac.com
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Install memory in an iMac - Apple Support
HOW I UPGRADED MY iMAC 21.5in Late 2013 MODEL (SSD & RAM UPGRADE) - YouTube
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How to Upgrade iMac Hard Drive or SSD 2012-2022: EveryMac.com
Apple's new 'Assembled in USA' iMac a bear to upgrade, repair • The Register
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iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
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Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
SOLVED: Need more ram for iMac 21.5 late 2013 - iMac Intel 21.5" EMC 2638 - iFixit
21.5-inch iMac (Late 2013) Review: Iris Pro Driving an Accurate Display
2013 iMac teardowns reveal SSD slots, soldered-in CPU in the 21.5” model | Ars Technica