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
Apple iMac Mac OS X 10.11, El Capitan 2008 Apple Desktops & All-In-One Computers for sale | eBay
how to Install from 2gb to 6gb gig Ram in 2008 Imac MAC 2.4 Ghz core Duo 2 Intel chip upgrade memory - YouTube
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Memory Upgrades for Apple iMac 2008 - Up to 6GB
parts-quick 6GB Kit (4GB + 2GB) Memory for iMac 2008 Apple MacBook 2009 PC2-6400 800MHz DDR2 SODIMM at Amazon.com
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
How to Upgrade iMac RAM (20" and 24" Aluminum): EveryMac.com