8GB -2x4GB Memory Ram Upgrade 20" Apple iMac 9.1 2.66GHz Core 2 Duo Early 2009 | eBay
How to Upgrade iMac RAM (20" and 24" Aluminum): EveryMac.com
Apple iMac 20-inch Mid 2009 - 2.26GHz Core 2 Duo Desktop RAM Memory | Kingston
Install memory in an iMac - Apple Support
iMac | 2.0 GHz Core 2 Duo | 20 Inch | Mid 2009 - Techable.com
iMac Intel 20" EMC 2266 Repair - iFixit
How to Upgrade Memory in a Late 2009 21.5-inch or 27-inch iMac - YouTube
Install memory in an iMac - Apple Support
iMac (2009) RAM & Storage Upgrades
iMac (2009) RAM & Storage Upgrades
Install memory in an iMac - Apple Support
Install memory in an iMac - Apple Support
Memory RAM Upgrade for Apple iMac 20-inch Early 2009 4GB DDR3 SODIMM | eBay
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
OWC 6GB (2GB + 4GB) PC8500 DDR3 1066MHz SO-DIMMs Memory Compatible with Late 2008, Early 2009, Early 2010 MacBook, MacBook Pro Unibody Models, 2009/2010 Mac Mini, 2009 iMac Models at Amazon.com