Just got my 16gb of RAM from OWC in the mail today and swapped out my 4gb stock in my 2012 cmbp 15" 2.3. It smokes now. No beach balls anymore. Wow. It was so easy. It took 5 minutes to do it. I ran some time tests on A game loading and playing before and after and the game is definitely more fluid and quicker. I haven't check fps yet but everything is running better. Plus I have 9 Gb free and am streaming an hd movie via Apple TV AirPlay while gaming. Best $100 investment. Glad I got 16.