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Can you upgrade the RAM in the 27-inch iMac? | iMore
How-To: Boost your Mac's speed and prolong its useful life with easy RAM upgrades - 9to5Mac
Is it worth it to upgrade RAM on Mid 2010 21.5 iMac? | MacRumors Forums
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How to Upgrade the RAM in Your iMac
Install memory in an iMac - Apple Support
How to Install RAM in an iMac: 5 Steps (with Pictures) - wikiHow
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