Retro Review: iMac Core 2 Duo (Late 2006), 15 Years Later! Still Usable?! - YouTube
A-Tech for Apple 6GB Kit (1x2GB + 1x4GB) DDR2 667MHz PC2-5300 200-pin SODIMM for MacBook (Late 2007, Early 2008, Early 2009), MacBook Pro (Mid 2007, Early 2008), iMac (Mid 2007) - Memory RAM Upgrade at Amazon.com
Install memory in an iMac - Apple Support
I Fixed My Dads Old Mid-2007 Mac. 13 Years And This Boy Still Has Many More Years Of Use To Go! : r/mac