1600 would be a little better --- IF it is a better set of sticks, if you go and buy 1600/11 and already have 1333/9 then the 1333 will better overall performance wise, but if you have slow 1333 say 10 or 11 CL and get a good set of 1600/7 or 8 the 1600 will show the better performance where you might notice a bit