according to Apple) these models only support 8GB of RAM. A Battery replacement is available for this system (see the bottom of the product page for installation video). MacBook Pro (15', Mid 2012) This model has two memory slots capable of taking 204-pin PC3-12800 (1600 MHz) DDR3 SO-DIMM memory chips.And of course, you’ll need a larger 2.5-inch HDD or 2.5-inch SSD. Follow this guide to do the installation.
#APPLE MACBOOK PRO MID 2012 MEMORY DRIVER#
#APPLE MACBOOK PRO MID 2012 MEMORY INSTALL#
Then follow this guide to install the RAM.
All the tools you'll need are in the Essential Electronics Toolkit and an Medium Anti-static mat is also recommended.