iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
8GB PC3-8500 RAM for Apple iMac Late 2009 - 27 Inch MC507LL/A Memory Upgrade Module
Install memory in an iMac - Apple Support
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
Apple iMac 24-inch, Early 2009 - 2.66GHz Core 2 Duo Memory RAM Upgrades - FREE Delivery & Guaranteed Compatible | Mr Memory®
Install memory in an iMac - Apple Support
How to Upgrade the RAM in Your iMac
Timetec Hynix IC 16GB KIT(4x4GB) Compatible for Apple Late 2009 iMac 21.5-inch / 27-inch DDR3 1067MHz/1066MHz PC3-8500 CL7 204 Pin 1.5V SODIMM RAM Upgrade for iMac 10,1 iMac 11,1 (16GB KIT(4x4GB)) - Walmart.com
Memory Upgrades for Apple iMac 2009 - Up to 32GB
iMac (2009) RAM & Storage Upgrades
Install memory in an iMac - Apple Support
Buy Timetec Hynix IC 4GB Compatible for Apple DDR3 1067MHz 1066MHz PC3-8500 for Mac Book, Mac Book Pro, iMac, Mac Mini Late 2008, EarlyMidLate 2009, Mid 2010 MAC SODIMM Memory RAM Upgrade
Benefits from RAM upgrade to Late 2009 iMac | MacRumors Forums
How to Upgrade the RAM in Your iMac
Buy Timetec 8GB KIT2x4GB Compatible for Apple DDR3 1067MHz 1066MHz PC3-8500 CL7 for Mac Book, Mac Book Pro, iMac, Mac Mini Late 2008, EarlyMidLate 2009, Mid 2010 SODIMM Memory MAC RAM Upgrade