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Apple iMac review (21.5-inch, 2015): 4K is optional, faster hard drives shouldn't be | Engadget
iMac 21.5-inch (2017) Review: Ultimate Refinement | Macworld
Apple 21.5" iMac® Intel Core i5 (2.3GHz) 8GB Memory 1TB Hard Drive Silver MMQA2LL/A - Best Buy
OWC Tears Down iMac Retina 4K, Confirms Memory Is Soldered
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Apple iMac 21.5" Core i5-4570R 2.70 GHz, 8GB RAM, 1TB HDD, 10.15.6 Lat – Pc Retro Shop
Review: Apple's 21.5" iMac with Retina 4K display gets solid 2017 architectural refresh | AppleInsider
