Actually you'll get better performance from the 1333 sticks in this case, if the 1333 were CL10, then the 1600 would have just a slight advantage due to the bandwidth, but here with the CL9 on the 1333, they will turn the DRAM over more often so they would have the slight performance edge ---- regardless, if looking at 1600 sticks, the HIGHEST CL you should look at is 9, which is a base, for performance either CL7 or 8........with 1333 highest is CL8 to look at...