NEMIX RAM 16GB Kit (2x8GB Upgrade) DDR3-1600 SODIMM PC3-12800 for Apple MacBook Pro Mid 2012 / iMac Late 2012 / iMac 2013, Late 2014, Mid 2015, Mac Mini Late 2012 at Amazon.com
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Timetec Hynix Ic Apple 16Gb Kit (2X8Gb) Ddr3L 1600Mhz Pc3L-12800 Sodimm Memory Upgrade For Macbook Pro13-Inch/15-Inch Mid 2012, Imac 21.5-Inch : Amazon.in: Computers & Accessories
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iMac (21.5-inch, Late 2012)のメモリ増設は、Apple StoreとApple正規サービスプロバイダに持ち込んで行う | サポート | Mac OTAKARA