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Apple's new 21.5" iMac with 4K Retina screen has user replaceable RAM and modular CPU
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2017 21.5-inch 4K iMac memory upgrade kit includes 32GB of RAM, tools to take it apart | AppleInsider
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iMac Retina 4K, 21 5 inch, 2017 Ram UpGrade 32GB - YouTube
Apple's New 21.5 Inch iMac Has Upgradeable Parts — That's a Huge Deal
Review: Apple's 21.5" iMac with Retina 4K display gets solid 2017 architectural refresh | AppleInsider
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64GB RAM upgrade kit for 21.5-inch iMAC now offered by OWC - 9to5Mac
Apple iMac 21.5" 4K (2017): Unboxing & Review - YouTube
iMac 21.5" 2.7Ghz i5 RAM & SSD UPGRADE 2017 - YouTube
Memory Upgrades for iMac 21.5-Inch 2017
Timetec 16GB Compatible for Apple 2017 iMac (27-inch w/Retina 5K, 21.5-inch w/Retina
iMac 21.5 -inch (Retina 4K) 3.0GHZ Quad Core i5 (Mid 2017) 8GB 1TB – Coretek Computers
Apple 21.5" Core i5 iMac with Retina 4K Display (Mid 2017) - USAnotebook.com - Klugex Inc.
Refurbished Apple iMac 18,2/i5-7500/8GB RAM/1TB HDD/21.5-inch 4K RD/AMD Pro 560+4GB/C (Mid - 2017) | Mac4sale
Mac RAM Upgrade, Best iMac Memory Upgrade – Best Reviews
