iMac (Retina 4K, 21.5-inch, 2019) - Technical Specifications
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Apple 2021 iMac with 4.5K Retina Display (24-inch/60.96 cm, M1 chip with 8‑core CPU and 8‑core GPU, 8GB RAM, 256GB) - Silver : Amazon.in: Computers & Accessories
Upgrading to a 4K monitor: enjoy Retina quality graphics on an external display
iMac Intel 21.5" Retina 4K Display Teardown - iFixit
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Apple 21.5" Certified Refurbished iMac with Retina 4K Display Intel Core i3 3.6GHz 8GB Memory 1TB HDD (2019) Silver MRT32LL/A - Best Buy
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Mac external displays for designers and developers, part 2
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Upgrading to a 4K monitor: enjoy Retina quality graphics on an external display
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Retina Display vs. 4K vs. True Tone
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Use a 4K Monitor in Retina Mode on Your Mac - The Mac Observer
