RAM Type: PC3-12800 DDR3L Min. RAM Speed: 1600 MHz
Details: Supports 1600 MHz PC3-12800 DDR3L SDRAM SO-DIMMs (204-pin).
Standard RAM: 8 GB Maximum RAM: 16 GB*
Details: 8 GB of RAM is installed as two 4 GB modules, no slots free.
*Apple officially supports a maximum of 8 GB of RAM, but third-parties have determined that this model actually is capable of using up to 16 GB of RAM with two 8 GB memory modules.
*
* http://www.everymac.com/systems/apple/macbook_pro/specs/macbook-pro-core-i7-2.9-13-mid-2012-unibody-usb3-specs.html