Install memory in an iMac - Apple Support
iMac Intel 21.5" EMC 2428 (Mid 2011) Memory Maxxer RAM Upgrade Kit
iMac 12,1 (21.5-inch, Mid 2011) Intel Core i5 | i7
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Apple iMac 12,2 27" 2011 A1312 Intel Core i7 2600 @ 3.40GHz 16GB RAM 1TB HDD | eBay
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Apple iMac 12,1 - 21.5" 2011 A1311 - i5 @ 2.50GHz 4GB RAM 500GB HDD - Very Good | eBay
Amazon.com: Timetec 32GB KIT(4x8GB) Compatible for Apple DDR3 1333MHz PC3-10600 CL9 for iMac (Mid 2010 27 inch, Mid 2011 21.5/27 inch) SODIMM Memory Module MAC RAM Upgrade for iMac 11,3 / iMac 12,1 / iMac 12, 2 : Electronics
Refurbished Apple iMac 12,1/i5-2400S/16GB RAM/256GB SSD/AMD HD 6750M/21.5-inch/DVD-RW/B (Mid - 2011) | Refurbmac
Apple iMac 12,2 2011 A1312 27" Core i5 2.7GHz 32GB RAM 500GB SSD HD...
Apple iMac 12,1 2011 Core i5 2.5GHz 12GB RAM 500GB OSX 10.13 A1311 MC309LL/A | eBay
Memory Upgrades for Apple iMac 2011 Up to 32GB
21.5-inch or 27-inch iMac (Mid 2011) Memory Installation iMac12,1 iMac12,2 - YouTube
iMac "Core i5" 2.5 21.5" (Mid-2011) Specs (Mid-2011, MC309LL/A, iMac12,1, A1311, 2428): EveryMac.com
Amazon.com: Timetec 32GB KIT(4x8GB) Compatible for Apple DDR3 1333MHz PC3-10600 CL9 for iMac (Mid 2010 27 inch, Mid 2011 21.5/27 inch) SODIMM Memory Module MAC RAM Upgrade for iMac 11,3 / iMac 12,1 / iMac 12, 2 : Electronics
Apple iMac 2.5Ghz i5-2400S (Mid-2011) *No HDD/RAM* – MSU Surplus Store
Memory Upgrades for Apple iMac 2011 Up to 32GB
Amazon.com: Timetec 32GB KIT(4x8GB) Compatible for Apple DDR3 1333MHz PC3-10600 CL9 for iMac (Mid 2010 27 inch, Mid 2011 21.5/27 inch) SODIMM Memory Module MAC RAM Upgrade for iMac 11,3 / iMac 12,1 / iMac 12, 2 : Electronics
Memory RAM | 8GB - Apple iMac iMac12,1 - - 1333MHz, Unbuffered, 1,5V
Install memory in an iMac - Apple Support
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Apple iMac MC309LL/A Mid-2011 21.5" - A1311 - 2.5GHz/12GB/500GB - iMac 12,1 | eBay
Apple iMac 12,1 A1311 - i5 - 16GB RAM - 512GB SSD - Zer shop
Apple iMac 12,1 2011 Core i5 2.5GHz 12GB RAM 500GB OSX 10.13 A1311 MC309LL/A | eBay
Refurbished Apple iMac 12,2/i5-2500S/4GB RAM/1TB HDD/6770/27"/C (Mid - 2011) | Mac4sale
4GB RAM Memory Upgrade for Apple iMac 12,1 Intel Core i3 21.5-inch MC309LL/A | eBay
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