A-Tech for Apple 4GB Kit (2X 2GB) DDR3 1067MHz / 1066MHz PC3-8500 SODIMM Memory RAM
Memory Upgrades for Apple iMac 2011 Up to 32GB
Install memory in an iMac - Apple Support
Install memory in an iMac - Apple Support
CMS 8GB (2X4GB) DDR3 8500 1066MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac Core 2 Duo 3.06 21.5-Inch (Late 2009) - A35
iMac Early 2009 (20-inch and 24-inch) RAM Upgrade Dallas – Apple Mac Computer Repair Dallas , Laptop ,Desktop ,iMac ,MacBook iPhone iPad Data Recovery ,Virus
Install memory in an iMac - Apple Support
How to Upgrade Memory in a Late 2009 21.5-inch or 27-inch iMac - YouTube