iMac | 3.06 GHz Core 2 Duo | 21.5 Inch | Late 2009 - Techable.com
Install memory in an iMac - Apple Support
Install memory in an iMac - Apple Support
Memory Upgrades for Apple iMac 2011 Up to 32GB
Memory RAM Upgrade for Apple iMac 27-inch Late 2009 4GB DDR3 SODIMM | eBay
iMac (2009) RAM & Storage Upgrades
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