Hi everyone, I received a mid 2012 MacBook Pro from my sister and I was wondering if there are any upgrade options I can perform. Occasionally, I seen posts of people talking about the 2012 MacBook Pro being upgradable (RAM and HDD I believe?). Although wiki says the RAM is not upgradable, so I am a bit confused. What is the maximum I can go up to for the RAM and I am assuming the CPU is not upgradable? Is there any Retina model out there that is upgradable? Current Specs: MacBook Pro (13-inch, Mid 2012) 2.5 GHz Intel Core i5 4 GB 1600 MHz DDR3 Intel HD Graphics 4000 1536 MB Model A1278 Thanks!