Teardown of new 21.5-inch iMac surprisingly reveals user-upgradable RAM, modular CPU - 9to5Mac
Apple iMac 21.5" Desktop Core i5 8GB Ram 1TB Bluetooth Webcam WiFi Catalina OS | eBay
APPLE IMAC 21.5″ WITH RETINA 4K DISPLAY – INTEL 8TH GEN CORE I5 – 8GB RAM – 256GB SSD – Techwings Store
Install memory in an iMac - Apple Support
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New 21.5-inch iMac least repairable yet due to lack of RAM, hard drive upgradability - 9to5Mac
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Memory Upgrades for iMac 21.5-Inch 2019
21.5" iMac Has No User-Upgradable RAM; 27" Has Four Accessible RAM Slots - MacRumors
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Apple A1418 iMac 21.5" 2013 3.1GHz Intel i7 16GB RAM 1TB HDD OS10.13.6
Review: 21.5-inch 2012 iMac takes two steps forward, one step back | Ars Technica
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HOW TO: Upgrade The RAM to 32GB on a Mid-2011 21.5inch iMac - YouTube
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iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
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