I would not overclock 1333 ram to 1600, likely it'll burn out in short time.
Your going to end up running both sets at 1333.
For gaming you really don't need 8GB or ram, just stick with the 4GB of 1600.
Any way to OC CPU and leave ram @ 1333 ?
Also whats a new game out today that i can test my GPU / CPU on to see what Avg FPS i get ? < one that will push both.