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Apple iMac with 4K Retina display (21.5-inch, 2015) review: Apple packs more pixels into its smallest iMac - CNET
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I replaced my 2015 iMac with a 2013 Mac Pro and 4k monitor. I also upgraded the CPU in the Mac Pro. : r/macsetups
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YouTuber upgrades base-model 5K iMac with seventh-gen Intel Core i7 processor, 64 GB of RAM, and more [Video] - 9to5Mac
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