A-Tech 16GB Kit (2x8GB) DDR3 1066MHz / 1067MHz PC3-8500 SODIMM RAM for Apple MacBook (13 inch, Mid 2010), MacBook Pro (13 inch, Mid 2010), iMac (27 inch, Late 2009), Mac Mini (Mid 2010) at Amazon.com
iMac 21.5" Late 2009 (10,1) - CPU Upgrade E8600 | MacRumors Forums
Early 2009 model iMac Computer, DDR3 8GB (2x4GB) RAM Replacement - YouTube
Can the Late 2009 27" iMac handle 32GB of RAM? | MacRumors Forums
iMac | 2.66 GHz Intel i5 | 27 Inch | Late 2009 - Techable.com
A-Tech 16GB Kit (2x8GB) DDR3 1066MHz / 1067MHz PC3-8500 SODIMM RAM for Apple MacBook (13 inch, Mid 2010), MacBook Pro (13 inch, Mid 2010), iMac (27 inch, Late 2009), Mac Mini (Mid 2010) at Amazon.com
How to Upgrade Memory in a Late 2009 21.5-inch or 27-inch iMac - YouTube
Apple iMac Late 2009 All in One Pc i7 16gb Ram 2TB HHD 2.8gz Selling as Is | eBay