I just upgraded my Mid-2012 Non-Retina MBP (2.9GHz i7, 750GB@5400RPM) from 2x 4GB DDR3-1600 to 2x 8GB DDR3-1600. So far it works flawlessly and I am about to upgrade the hard drive in it to a 1TB SSD. I am installing Crucial memory and their MX500 SSD.
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