8GB Memory (PC3L-12800, DDR3L 1600MHz) for Apple MacBook Pro 15 inch A1286 Mid 2012. Apple MacBook Pro 13 inch A1278 - Mid 2012. iMac 21.5 inch A1418 Late 2012, A1418 Early 2013,
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
How to Upgrade iMac RAM: 2012-2022: EveryMac.com
iMac (21.5-inch, Late 2012) - 2.7GHz QuadCore i5 / 8GB RAM / 240GB SSD – Mac Alert
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