8GB -2x4GB Memory Ram Upgrade for 27" Apple iMac 11.1 Core i7 2.8GHz Late 2009 | eBay
iMac 21.5" Late 2009 (10,1) - CPU Upgrade E8600 | MacRumors Forums
16GB (4GBx4) Team High Performance Memory RAM Upgrade For iMac “Core 2 Duo” 3.06 21.5-Inch (Late 2009) MB950LL/A iMac 10,1 1. The Memory Kit comes with Life Time Warranty. at Amazon.com
Benefits from RAM upgrade to Late 2009 iMac | MacRumors Forums
Install memory in an iMac - Apple Support
Can the Late 2009 27" iMac handle 32GB of RAM? | MacRumors Forums
Is it worth upgrading my ram on a Late 2009 iMac? New iMacs/MacBooks are very pricey. It's currently running on 4GB of RAM & it has a 3.06GHz Intel Core Duo Processor. :
Install memory in an iMac - Apple Support
How to Upgrade Memory in a Late 2009 21.5-inch or 27-inch iMac - YouTube