Just so you guys know, this is how you calculate speed from ram,
the guy up top is saying get 1600, yes i would agree but it would be a lot pricey-er for the 9 CAS, if you get 11 CAS it is slower than 1333 with a CAS of 9
1600/11=145
1333/9=148
1333 is the same price and pretty much faster(only a bit)