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Don't Upgrade The RAM In Your New Apple iMac, Do This Instead
Install memory in an iMac - Apple Support
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How to Upgrade the iMac 24-inch (Early 2009)
Install memory in an iMac - Apple Support
iMac 24-inch (Early 2009) Core 2 Duo 2.66GHz - HDD 640 GB - 4GB | Back Market