Early 2009 model iMac Computer, DDR3 8GB (2x4GB) RAM Replacement - YouTube
Install memory in an iMac - Apple Support
20- and 24-inch iMacs (Early 2009) review | Macworld
Install memory in an iMac - Apple Support
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CMS 4GB (2X2GB) DDR3 8500 1066MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac Early 2009 LAT 2009 Core 2 Duo DDR3 1067 MHz RAM - A47 at Amazon.com
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iMac (2009) RAM & Storage Upgrades
iMac 20-inch (Early 2009) Core 2 Duo 2.66GHz - HDD 160 GB - 1GB | Back Market
Apple A1225 24-inch iMac Core 2 Duo 2.4 GHz 2 GB RAM 320 GB HDD Early 2009 | RecycledGoods.com
Apple Imac 20" Early 2009 A1224 Intel Core 2 2.66ghz 4gb Ram High Sierra & More | eBay
Install memory in an iMac - Apple Support
Timetec Hynix IC 16GB KIT(2x8GB) Compatible for Apple DDR3 PC3-8500 1067MHz/1066MHz Upgrade for MacBook 13'' Mid 2010, MacBook Pro 13'' Mid 2010, iMac 27''Late 2009, Mac Mini Mid 2010(16GB KIT(2x8GB)) - Newegg.com