How to upgrade RAM on iMac 21.5" 2011 - YouTube
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Install memory in an iMac - Apple Support
iMac Intel 21.5" EMC 2428 RAM Replacement - iFixit Repair Guide
Maximum memory for 2011 iMac - Ask Different
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How to Upgrade iMac RAM (21.5" and 27" Aluminum): EveryMac.com
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iMac RAM Memory Installation 2009 2010 2011 21 5" Apple Dollars #13 - YouTube
Memory Upgrades for Apple iMac 2011 Up to 32GB
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Install memory in an iMac - Apple Support
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