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Apple's 4K 21.5-Inch iMac Allows You to Upgrade RAM and CPU – Company Finally Dialing Down on Soldered Components, Reveals Teardown
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2017 21.5-inch 4K iMac memory upgrade kit includes 32GB of RAM, tools to take it apart | AppleInsider
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Apple iMac A1418 21.5" 2017 4K Retina Quad Core i5-7400 3.0GHz 1TB HDD 8GB RAM – ASA College: Florida
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