Apple iMac 2009 A1312 MB952LL/A 27" C2D E7600 3.06GHz, 12GB RAM, 1TB HD Catalina 885909286300 | eBay
Apple iMac 27" Late 2009 i7-860 2.8GHz 16 GB RAM, 240GB SSD, Radeon HD 6970M 1GB | eBay
Memory Upgrades for Apple iMac 2009 - Up to 32GB
iMac Intel 27" EMC 2309 and 2374 Teardown - iFixit
Apple iMac (27-inch, unibody, 2009) review: Apple iMac (27-inch, unibody, 2009) - CNET
A-Tech for Apple 2GB DDR3 1067MHz / 1066MHz PC3-8500 SODIMM Memory RAM Module for MacBook, MacBook Pro, iMac, Mac Mini - (Late 2008, Early 2009, Mid 2009, Late 2009, Mid 2010) Models at Amazon.com
8GB -2x4GB Memory Ram Upgrade 21.5" Apple iMac 10.1 3.06GHz Core2Duo Late 2009 | eBay
Can the Late 2009 27" iMac handle 32GB of RAM? | MacRumors Forums
Install memory in an iMac - Apple Support
A-Tech for Apple 4GB Kit (2X 2GB) DDR3 1067MHz / 1066MHz PC3-8500 SODIMM Memory RAM
Sold - 27" iMac Late 2009 // $295 - Boulder Mac Repair
iMac 21.5" Late 2009 (10,1) - CPU Upgrade E8600 | MacRumors Forums
2009 27" iMac Core i7 can take (2x8GB) 16GB DDR3 1600Mhz RAM? | MacRumors Forums
Install memory in an iMac - Apple Support
iMac | 2.66 GHz Intel i5 | 27 Inch | Late 2009 - Techable.com
Install memory in an iMac - Apple Support
Install memory in an iMac - Apple Support
Review: Apple's 27" big screen iMac (late 2009) | AppleInsider