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Timetec 16GB KIT(4x4GB) Compatible for Apple DDR3 1067MHz / 1066MHz PC3-8500 CL7 Dual Rank for iMac (Late 2009 21.5-inch / 27-inch) SODIMM Memory MAC RAM Upgrade for iMac 10,1 and iMac 11,1 at Amazon.com
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iMac Memory Upgrade (2007 Model) - YouTube
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20-Inch iMac (2007-2008) Hard Drive Installation Video (iMac7,1 iMac8,1) - YouTube