iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
Install memory in an iMac - Apple Support
iMac "Core i5" 2.5 21.5" (Mid-2011) Specs (Mid-2011, MC309LL/A, iMac12,1, A1311, 2428): EveryMac.com
Apple iMac 2011 (Mid) 21.5-inch (iMac 11,2) SSD ,Ram & OSX Upgrades - ZD Laptop Service Centre
Apple 21.5” iMac (Mid 2011); iMac12,1 Installation Guides and Specifications - Macfixit Australia
21.5-inch or 27-inch iMac (Mid 2011) Memory Installation iMac12,1 iMac12,2 - YouTube
Install memory in an iMac - Apple Support
iMac Intel 21.5" EMC 2389 RAM Replacement - iFixit Repair Guide
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iMac 21.5" Mid 2011 How To Change/Upgrade Your Ram For Better Performance 2014 - YouTube
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HOW TO: Upgrade The RAM to 32GB on a Mid-2011 21.5inch iMac - YouTube
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Memory Upgrades for Apple iMac 2011 Up to 32GB
Install memory in an iMac - Apple Support
Install memory in an iMac - Apple Support
Install memory in an iMac - Apple Support
Apple Launching Pilot Program Allowing Repairs of Soon-to-Be Vintage Mid 2011 iMac in United States - MacRumors
Install memory in an iMac - Apple Support
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