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iMac Intel 21.5" EMC 2428 (Mid 2011) Memory Maxxer RAM Upgrade Kit
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A-Tech for Apple 8GB Kit 2X 4GB PC3-10600 1333Mhz Mac Mini iMac Mid 2011 Mid 2010 Late 2011 MC508LL/A A1311 MC509LL/A MC510LL/A A1312 MC978LL/A MC816LL/A A1347 MC936LL/A Memory RAM at Amazon.com
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21.5-inch or 27-inch iMac (Mid 2011) Memory Installation iMac12,1 iMac12,2 - YouTube
iMac RAM Memory Installation 2009 2010 2011 21 5" Apple Dollars #13 - YouTube
Mid 2011 Apple iMac 21.5" A1311 i5 2.7GHz 8GB RAM 1TB HD OSX Sierra - DCPS Computer Program
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iMac A1311 Elpida 4GB (2x2GB) PC3-10600S SO-DIMM Memory RAM EBJ20UF8BCS0-DJ-F #1
How to upgrade RAM on iMac 21.5" 2011 - YouTube
iMac Intel 21.5" EMC 2428 RAM Replacement - iFixit Repair Guide
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Memory Upgrades for Apple iMac 2011 Up to 32GB
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Install memory in an iMac - Apple Support
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Apple A1311 iMac 21.5" Mid-2010 Intel i3 3.06GHz 4GB RAM 240GB SSD OS
How to Upgrade iMac RAM (21.5" and 27" Aluminum): EveryMac.com
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CMS 8GB (2X4GB) DDR3 10600 1333MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac 21.5" Intel Core I7 2.8Ghz (A1311) - A29 at Amazon.com
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
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