I am considering buying a Mac and I plan to game on it. So I need to know if 1 GB of GDDR5 RAM on a AMD Radeon HD 6770M will do the trick to be running games on mid to high setting on 1080p at 60 FPS. Also I need to know if this will stand the test of at least 6 years. Also there will be 16 GB of DDR3 1333MHz ram in it too.