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
16GB 1600mhz vs 16GB 1866mhz RAM for Macbook Pro 13" mid 2012 | MacRumors Forums
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com