Hello, I have an a8-4500m apu with a single 4gb 1333 mhz stick. I will be upgrading the RAM soon, would it be better to just buy another stick of 4gb 1333 mhz or spend a lot more on 4gb x 2 1600 mhz ram? I know the performance with 1600 is better, and I plan on upgraded the cpu (mine is socket) in the future, but just purchasing another 4gb 1333 mhz would save a lot and not waste the other stick. Please help!