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Apple's new 'Assembled in USA' iMac a bear to upgrade, repair • The Register
2013 iMac teardowns reveal SSD slots, soldered-in CPU in the 21.5” model | Ars Technica
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iMac Intel 21.5" EMC 2638 RAM Replacement - iFixit Repair Guide
16GB -2x8GB Memory Ram Upgrade 21.5" Apple iMac-14.1 Core i5 2.7GHz Late 2013 | eBay
OWC SSD Upgrade Kits for 21.5-Inch iMac (2013 - 2019)
