Timetec 16GB KIT(4x4GB) Compatible for Apple DDR3 1067MHz / 1066MHz PC3-8500 CL7 Dual Rank for iMac (Late 2009 21.5-inch / 27-inch) SODIMM Memory MAC RAM Upgrade for iMac 10,1 and iMac 11,1 at Amazon.com
16GB -2x8GB Memory Ram Upgrade for 27" Apple iMac 11.1 Core i7 2.8GHz Late 2009 | eBay
iMac | 3.33 GHz Core 2 Duo | 27 Inch | Late 2009 - Techable.com
iMac 27" 2.8GHz (Late 2009) | mac of all trades
Timetec 8GB KIT(2x4GB) Compatible for Apple DDR3 1067MHz / 1066MHz PC3-8500 CL7 for Mac Book,