A-Tech 4GB PC3-8500 DDR3 1066/1067 MHz RAM for MacBook, MacBook Pro, iMac, Mac Mini (Late 2008, Early/Mid/Late 2009, Mid 2010) | 204-Pin SODIMM Memory Upgrade Module at Amazon.com
iMac (2009) RAM & Storage Upgrades
iMac (2009) RAM & Storage Upgrades
Apple iMac 20-inch Early 2009 2.66GHz Intel Core 2 Duo (MB417LL/A) – UNICOM, Inc.
8GB -2x4GB Memory Ram Upgrade For 20" Apple iMac 9.1 2.25GHz Core2Duo Mid 2009 | eBay
A-Tech for Apple 6GB Kit (1x2GB 1x4GB) DDR2 667MHz PC2-5300 200-pin SODIMM for MacBook (Late 2007, Early 2008, Early 2009), MacBook Pro (Mid 2007, Early 2008), iMac (Mid 2007) - Memory RAM Upgrade at Amazon.com
How to Upgrade iMac RAM (20" and 24" Aluminum): EveryMac.com
how to upgrade iMac early 2009 SSD and RAM - full class - YouTube
iMac (2009) RAM & Storage Upgrades
Apple iMac 24-inch Early 2009 2.66GHz Intel Core 2 Duo (MB418LL/A) – UNICOM, Inc.