Apple MacBook Pro Retina 15" (256GB SSD, Intel Core i7 4th Gen., 2.20 GHz, 16GB) Laptop - Silver - MGXA2LL/A (Mid 2014) for sale online | eBay
MacBook Pro 13" and 15" Retina (Late 2013-Mid 2014) SSD
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How to add a fast new SSD to your old Mac or MacBook for only $150 - 9to5Mac
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Amazon.com: M.2 NVME SSD Convert Adapter, 12+16pin M.2 NGFF M-Key SSD Convert Card for MacBook Air Pro Retina Mid 2013 2014 2015 2016 2017, NVME AHCI SSD Upgraded Kit for A1465 A1466