Is this a self build?Is this your Mobo? Asus, if so did you check the memory support list. In my my self builds RAM compatibility has been a problem in the past.This sounds like a ram problem. What's the serial number of the RAM?
Without knowing a bit more about your RAM it is difficult to give further advice,if you are only installing 2 sticks of ram then in your mobo's case I would stick them in the slots 1 and 3 and see what your timings are.