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Install memory in an iMac - Apple Support
iMac (2007-2009) Memory Installation Video - YouTube
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iMac (2009) RAM & Storage Upgrades
Install memory in an iMac - Apple Support
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Memory Upgrades for Apple iMac 2009 - Up to 32GB
OWC 16GB (4 x 4GB) PC8500 DDR3 1066MHz SO-DIMMs Memory Compatible with iMac 21.5" and 27" (October/2009) at Amazon.com
8GB kit (2x4GB) DDR3 1066 SODIMM for Apple iMac (2009), MacBook Pro (2 – Aplus Technology
How to Upgrade the RAM in Your iMac
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How to UPGRADE Ram on iMac (2009-2011) - YouTube
Install memory in an iMac - Apple Support
