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Apple launches new Retina 4K 21.5-inch iMac, all 27-inch iMacs now feature Retina 5K displays - 9to5Mac
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2015 iMac Reviews: 'Best All-in-One' Desktop, But Lacks USB-C and Fusion Drive Isn't Standard - MacRumors
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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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2015 iMac Reviews: 'Best All-in-One' Desktop, But Lacks USB-C and Fusion Drive Isn't Standard - MacRumors
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