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Review: Apple's 21.5" iMac with Retina 4K display gets solid 2017 architectural refresh | AppleInsider
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Apple iMac with 21.5in Retina 4K display (1TB Fusion Drive, Intel Core i5 8th Gen. 4.10 GHz, 8GB) Gray - MRT42LL/A (March, 2019) for sale online | eBay
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21.5-Inch iMac With Retina 4K Display Teardown Reveals CPU and RAM Can Be Upgraded | Technology News
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