Apple iMac (21.5-inch, Late 2009) 3.06GHz Intel Core 2 Duo 4GB RAM 640GB HD | eBay
How to Upgrade iMac RAM (21.5" and 27" Aluminum): EveryMac.com
iMac 10,1 (21.5-inch | 27-inch, Late 2009)
Install memory in an iMac - Apple Support
Install memory in an iMac - Apple Support
iMac | 3.06 GHz Core 2 Duo | 21.5 Inch | Late 2009 - Techable.com
Apple MC309LL/A 21.5 inch iMac Core i5 2.5 GHz 4GB RAM 500GB HDD Mid-2011 | Recycledgoods.com
Apple iMac 27 & 21.5 Late 2009 RAM Memory
8GB -2x4GB Memory Ram Upgrade 21.5" Apple iMac 10.1 3.06GHz Core2Duo Late 2009 | eBay
Install memory in an iMac - Apple Support
Memory RAM 1x 2GB Apple - iMac 21.5'' Late 2009 DDR3 1066MHz SO-DIMM | MC457G/A 1/2 | RAM MEMORY \ MEMORY FOR APPLE \ APPLE IMAC \ iMac Late 2009 \ iMac
iMac 21.5" Late 2009 - Core 2 Duo 3.0Ghz / 4GB RAM / 500GB HDD / 9400 256MB GPU - Apple
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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 :
Apple iMac (21.5-inch, Late 2015) review | TechRadar
iMac 27-inch (Late 2009) - AFROBAY
Ready to Use Apple iMac, 21.5 iMac Aluminium uniBody Late 2009 Model, Intel Core2Duo Processor @3.06GHz, 4GB RAM, Mac OS Installed, 500GB HDD, Nvidia GeForce 9400 256MB Graphics, DVD Drive, No Keyboard