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How to Upgrade iMac RAM (20" and 24" Aluminum): EveryMac.com
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Install memory in an iMac - Apple Support
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iMac 20-Inch "Core 2 Duo" 2.4 (Al) Specs (Mid-2007, MA877LL, iMac7,1, A1224, 2133): EveryMac.com
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Install memory in an iMac - Apple Support
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Install memory in an iMac - Apple Support
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How to Upgrade the RAM in Your iMac
The infamous 2007 iMac on Catalina | MacRumors Forums
