How I kept my iMac running for a decade | Cult of Mac
iMac (2009) RAM & Storage Upgrades
How To - RAM Upgrade iMac (Late 2007, Early 2008, Early 2009) GERMAN - YouTube
early 2009 iMac upgrade advice? | MacRumors Forums
iMac 21.5" Late 2009 (10,1) - CPU Upgrade E8600 | MacRumors Forums
Benefits from RAM upgrade to Late 2009 iMac | MacRumors Forums
Crucial - DDR2 - 4 GB: 2 x 2 GB - SO-DIMM 200-pin - 667 MHz / PC2-5300 - CL5 - 1.8 V - unbuffered - non-ECC - for Apple iMac; MacBook (Early 2008, Early 2009, Mid 2007); MacBook Pro - Hunt Office Ireland
iMac (Early 2009) | Low End Mac
iMac | 2.66 GHz Core 2 Duo | 20 Inch | Early 2009 - Techable.com
Memory RAM 1x 4GB Apple iMac Early 2009 DDR3 1066MHz SO-DIMM | E-OWC8566DDR3S4GB | APPLE \ MEMORY FOR APPLE \ OWC \ APPLE IMAC \ iMac Early 2009 \ iMac 20'' (Early