Amazon.com: Timetec 16GB KIT(2x8GB) Compatible for Apple DDR3 1333MHz PC3-10600 CL9 for Mac Book Pro (Early/Late 2011 13/15/17 inch), iMac(Mid 2010, Mid/Late 2011 21.5/27 inch), Mac Mini(Mid 2011) MAC RAM Upgrade :
apple-history.com / iMac (Mid 2010)
Apple iMac (27-Inch Mid 2011) 2.7GHz Intel Core i5 1TB HDD 4GB Memory for sale online | eBay