CMS 4GB (2X2GB) DDR2 5300 667MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac (Mid 2007) Pc2-5300 - A37 at Amazon.com
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Memory Upgrades for Apple iMac 2007 - Up to 6GB
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iMac 20-inch Mid 2007 – Full Tech Specs, Release Date, and Price
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