How to Upgrade iMac RAM (20" and 24" Aluminum): EveryMac.com
iMac G5 2004 20" EMC 2008 - used original spareparts for Macs
iMac (2007-2009) Memory Installation Video - YouTube
Apple iMac (20-Inch Early 2008) 2.66GHz Intel Core 2 Duo, 320GB HDD, 4GB Memory | eBay
iMac (Early 2008) RAM Upgrade - YouTube
iMac 8,1 (20-inch | 24-inch, Early 2008)
Apple iMac 24-inch Early 2008 3.06GHz Intel Core 2 Duo (MB398LL/A) – UNICOM, Inc.
8GB (4GBx2) Team High Performance Memory RAM Upgrade for iMac “Core 2 Duo” 2.66 20-Inch (Early 2008) MB324LL/A iMac 8,1. The Memory Kit Comes with Life Time Warranty. at Amazon.com
CMS 6GB (1X4GB) & (1X2GB) DDR2 6400 800MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac Core 2 Duo 2.4 20-Inch Early 2008 - B117 at Amazon.com
Apple iMac A1225 Early 2008 E8235 2.8GHz 4GB 320GB 24" | B-Grade 3mth Wty | Connecting Up