How to Upgrade Memory in a Late 2009 21.5-inch or 27-inch iMac - YouTube
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
ssd - What are my hardware upgrade options for a late 2009 iMac? - Ask Different
16GB Memory Upgrade Kit 2009 Apple Apple iMac
Review: Apple's 27" big screen iMac (late 2009) | AppleInsider
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
ram for late 2009 imac model | Newegg.com
Install memory in an iMac - Apple Support
Install memory in an iMac - Apple Support
Install memory in an iMac - Apple Support
Timetec 16GB KIT(4x4GB) Compatible for Apple DDR3 1067MHz / 1066MHz PC3-8500 CL7 Dual Rank for iMac (Late 2009 21.5-inch / 27-inch) SODIMM Memory MAC RAM Upgrade for iMac 10,1 and iMac 11,1 at Amazon.com
memory - What can be replaced/upgraded in a late-2009 iMac to make it run like a 2014-2016 iMac? - Ask Different
Apple iMac (27-inch, unibody, 2009) review: Apple iMac (27-inch, unibody, 2009) - CNET