2009 27" iMac Core i7 can take (2x8GB) 16GB DDR3 1600Mhz RAM? | MacRumors Forums
How to Upgrade the RAM in Your iMac
Amazon.com: OWC 16GB (4 x 4GB) PC8500 DDR3 1066MHz SO-DIMMs Memory Compatible with iMac 21.5" and 27" (October/2009) : Everything Else
iMac (2007-2009) Memory Installation Video - YouTube
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Install memory in an iMac - Apple Support
Timetec 8GB KIT(2x4GB) Compatible for Apple DDR3 1067MHz / 1066MHz PC3-8500 CL7 for Mac Book,
NEMIX RAM 8GB 2X4GB DDR3 Memory for Apple iMac 2009 - Newegg.com
Apple iMac (21.5-inch, Late 2009) A1311 Late 2009, Core 2 Duo 3.06GHz 4GB Ram | eBay