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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
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How to Upgrade iMac RAM (20" and 24" Aluminum): EveryMac.com
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iMac 2007-2009 – iRevive
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Memory Upgrades for Apple iMac 2007 - Up to 6GB
Apple iMac 7.1 (mid 2007) Intel Core 2 Duo @ 2.4ghz 2gb Ram 320 GB HDD Mac OS | eBay