Max RAM for my iMac 27" (late 2009) | MacRumors Forums
Install memory in an iMac - Apple Support
iMac Intel 21,5" Late 2009 EMC 2308 - used original spareparts for Macs
Install memory in an iMac - Apple Support
How to Upgrade Memory in a Late 2009 21.5-inch or 27-inch iMac - YouTube
Apple iMac (27-inch, unibody, 2009) review: Apple iMac (27-inch, unibody, 2009) - CNET
Install memory in an iMac - Apple Support
Memory Upgrades for Apple iMac 2009 - Up to 32GB
A-Tech 16GB Kit (2x8GB) DDR3 1066MHz / 1067MHz PC3-8500 SODIMM RAM for Apple MacBook (13 inch, Mid 2010), MacBook Pro (13 inch, Mid 2010), iMac (27 inch, Late 2009), Mac Mini (Mid 2010) at Amazon.com
16GB RAM on an iMac 24" (early 2009)? - Apple Community
How to Upgrade iMac RAM (21.5" and 27" Aluminum): EveryMac.com
Install memory in an iMac - Apple Support
iMac (2009) RAM & Storage Upgrades
Memory Upgrades for Apple iMac 2011 Up to 32GB
How-To: Boost your Mac's speed and prolong its useful life with easy RAM upgrades - 9to5Mac