parts-quick 6GB Kit (4GB + 2GB) Memory for iMac 2008 Apple MacBook 2009 PC2-6400 800MHz DDR2 SODIMM at Amazon.com
4GB Kit (2GBX2) DDR2 800MHz RAM Memory Upgrade for Apple iMac Core 2 Duo 20-inch (Early 2008) (PARTS-QUICK) - Walmart.com
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A-Tech for Apple 4GB Kit (2X 2GB) DDR3 1067MHz / 1066MHz PC3-8500 SODIMM Memory RAM
Install memory in an iMac - Apple Support
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32GB Memory Upgrade for Early 2008 Apple Mac Pro Tower
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Amazon.com: Timetec 8GB KIT(2x4GB) Compatible for Apple DDR3L 1600MHz for Mac Book Pro (Early/Late 2011,Mid 2012), iMac(Mid 2011,Late 2012,Early/Late 2013,Late 2014,Mid 2015), Mac Mini(Mid 2011,Late 2012) MAC RAM : Electronics