I bought this to upgrade my GF's 2012 Mackbook Pro. Before the swap, it ran Maverick and had a 500GB hard drive with 4GB of DDR3 RAM. I replaced it with a 250GB SSD and added 16GB of DDR3 RAM (the maximum allowed on a mid-2012 Macbook Pro). My girlfriend has never used her computer and now it works like a dream. She loves it and I originally upgraded to El Capitain before moving to High Sierra. It's so easy to turn what they call a "useless laptop" into a new Mackbook.
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