Well, I assume you have a DDR3 1333 mhz specced ram with 7-7-7-2x timing...
So ya. like the other person said, crucial makes really good ram and as long as you get something that's 1333 mhz with 7-7-7-2x timing, it should be fine.
(no point in getting faster ram since it would just get lowered to match the slowest ram on the motherboard)