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Tried upgrading RAM on a MacBook Pro 13 mid 2012, the 2x4 samsung ddr3 1600 MHz works as usual, but the newly (pictured) ddr3 4056mb ram does not work properly. I get
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CMS 16GB (2X8GB) DDR3 12800 1600MHz Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® MacBook Pro Core I5 2.5 13" Mid-2012 - A7 at Amazon.com
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Apple MacBook Pro 13.3-inch 500GB Intel Core i5 Dual-Core Laptop (MD101LL/A) Mid-2012 Pre-Owned Silver A1278 - Best Buy
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Mid 2012 13" inch MacBook Pro A1278 Disassembly RAM SSD Hard Drive Upgrade Repair OSX Install - YouTube
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Pure Beauty & Nostalgia: Apple Macbook Pro 9,2 (A1278) Mid 2012 running GNU Linux like a Pro (the perfect combo that just works) | dwaves.de
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MacBook Pro "Core i5" 2.5 13" Mid-2012 Specs (Mid-2012 13", MD101LL/A*, MacBookPro9,2, A1278, 2554*): EveryMac.com
![A-Tech 16GB Kit (2x8GB) RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/Late 2013, Late 2014, Mid 2015), Mac Mini (Late 2012) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com A-Tech 16GB Kit (2x8GB) RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/Late 2013, Late 2014, Mid 2015), Mac Mini (Late 2012) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com](https://m.media-amazon.com/images/I/71YrYjkKVXL._AC_UF350,350_QL80_.jpg)