Timetec 8GB KIT(2x4GB) Compatible for Apple DDR3 1067MHz / 1066MHz PC3-8500 CL7 for Mac Book, Mac Book Pro, iMac, Mac Mini (Late 2008, Early/Mid/Late 2009, Mid 2010) SODIMM Memory MAC RAM Upgrade
How to Upgrade Memory in a Late 2009 21.5-inch or 27-inch iMac - YouTube
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Install memory in an iMac - Apple Support
Timetec 8GB KIT(2x4GB) Compatible for Apple DDR3 1067MHz / 1066MHz PC3-8500 CL7 for Mac Book,
Apple iMac 20-inch Educational July 2009 2GHz Intel Core 2 Duo (MC015LL/A) | eBay
Apple Imac Mc015ll/b 2009 - Silver - Intel Core 2 Duo - 4GB RAM 160GB HDD - 20" | eBay
How to Upgrade iMac RAM (21.5" and 27" Aluminum): EveryMac.com