iMac Early 2009 (20-inch and 24-inch) RAM Upgrade Dallas – Apple Mac Computer Repair Dallas , Laptop ,Desktop ,iMac ,MacBook iPhone iPad Data Recovery ,Virus
Install memory in an iMac - Apple Support
Install memory in an iMac - Apple Support
How I kept my iMac running for a decade | Cult of Mac
How-To: Boost your Mac's speed and prolong its useful life with easy RAM upgrades - 9to5Mac