Memory RAM 1x 2GB Apple iMac Early 2009 DDR3 1066MHz SO-DIMM | E-OWC8566DDR3S2GB | APPLE \ MEMORY FOR APPLE \ OWC \ APPLE IMAC \ iMac Early 2009 \ iMac 24'' (Early
4GB PC3-8500 RAM for Apple iMac Late 2009 - 27 Inch MB952LL/A Memory Upgrade Module
Install memory in an iMac - Apple Support
How do the "Late 2009" Aluminum iMac models compare to the "Early 2009" models that preceded them?: EveryMac.com
8GB PC3-8500 RAM for Apple iMac Late 2009 - 27 Inch MC507LL/A Memory Upgrade Module