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HOW TO: Upgrade The RAM to 32GB on a Mid-2011 21.5inch iMac - YouTube
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CMS 32GB (4X8GB) DDR3 10600 1333MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac Core I7 3.4 27-Inch (Mid-2011) - C12 at Amazon.com
4GB to 32GB RAM Upgrade Apple iMac Mid 2011 - YouTube
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CMS 16GB (2X8GB) DDR3 10600 1333MHZ NON ECC SODIMM Memory Ram Compatible with Apple Imac "Core I5" 3.1 27-Inch (Mid-2011) - A13 - Walmart.com
NEMIX RAM 32GB (4x8GB Upgrade) DDR3-1333 PC3-10600 204-Pin SODIMM Memory for Apple MacBook Pro Early/Late 2011, iMac Mid 2010 27 inch 4-Core, iMac Mid 2011 21.5/27” , Mac Mini Mid 2011 at Amazon.com