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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Kingston Technology 4GB 1333MHz DDR3 Single Rank DIMM Memory for HP/Compaq Desktop KTH9600BS/4G at Amazon.com