Need to look at a combo of the two CL and freq 1333 has less bandwidth than 1600 (like up to 10,777MB vs 12,800) however, 1333 with CL8 moves more data than 1600 CL11 , for performance DRAM I use a step guide
1333/6 1600/7 1866/8 2133/9 2400/10
for basic DRAM
1333/8 1600/9 1866/10 2133/11 2400/12
anything beyond that is basically a waste of money (and only 1.5 sticks up through 1866, 1.6-1.65 is OK for 2133 and above)