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How to Upgrade iMac RAM (20" and 24" Aluminum): EveryMac.com
iMac 20-inch (Mid-2009) Core 2 Duo 2.26GHz - HDD 320 GB - 4GB | Back Market
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iMac (2009) RAM & Storage Upgrades
Install memory in an iMac - Apple Support
iMac 20-inch Mid 2009 – Full Tech Specs, Release Date, and Price
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