My iMac 20" late 2006. I want to upgrade this machine :) your ideas? : r/mac
Install memory in an iMac - Apple Support
How to Upgrade the RAM in Your iMac
A-Tech for Apple 4GB Kit 2X 2GB PC2-5300 667MHz Mac Mini iMac Late 2006 Late 2008 Mid 2007 A1208 MA589LL A1207 MA456LL A1200 MB138LL/A A1176 MB139LL/A Memory RAM at Amazon.com