Install memory in an iMac - Apple Support
4GB RAM Memory SODIMM for Apple iMac Intel 2009 20" 24" MC022BN/A | eBay
8GB -2x4GB Memory Ram Upgrade 24" Apple iMac 9.1 3.06GHz Core 2 Duo Early 2009 | eBay
Memory RAM Upgrade for Apple iMac 20-inch Early 2009 4GB DDR3 SODIMM | eBay
Install memory in an iMac - Apple Support
iMac RAM for Model 13.2 to 15.1| DDR3-1600MHz | 8GBx2 | MacMemory.com
How to UPGRADE Ram on iMac (2009-2011) - YouTube
Apple iMac 21.5-inch Late 2009 3.06GHz Intel Core 2 Duo (MB950LL/A) – UNICOM, Inc.
4GB DDR3-1066 (PC3-8500) RAM Memory Upgrade for The Apple iMac 2.66GHz 20" Early 2009 (MB417LL/A) (Genuine A-Tech Brand) at Amazon.com
A-Tech 16GB (4 x 4GB) PC3-8500 DDR3 1066/1067 MHz RAM for iMac Late 2009 21.5-inch / 27-inch | 204-Pin SODIMM Memory Upgrade Kit at Amazon.com
OFFTEK 4GB Replacement Memory RAM Upgrade for Apple iMac 2.66GHz Intel Quad Core i5 - (27-Inch) (DDR3 - Late 2009) (DDR3-8500) Desktop Memory at Amazon.com
Install memory in an iMac - Apple Support
How to Upgrade the RAM in Your iMac
Install memory in an iMac - Apple Support
Memory Upgrades for Apple iMac 2009 - Up to 32GB
How to Upgrade Memory in a Late 2009 21.5-inch or 27-inch iMac - YouTube
Install memory in an iMac - Apple Support
iMac Intel 27" EMC 2374 (Late 2009) Memory Maxxer RAM Upgrade Kit
OWC 16GB (4 x 4GB) PC8500 DDR3 1066MHz SO-DIMMs Memory Compatible with iMac 21.5" and 27" (October/2009) at Amazon.com
