I know that there are certain ways to arrange RAM especially if you have different sizes, however:
My suggestion is to throw it in and give it a shot. If it doesn't work, that means the mobo doesn't like it, in which case try different variations. If it works, you're good to go. if none of the variations work, put the original RAM back in and it should work again no problem.
This is easier than explaining the technical details and I have used this method in the past and never had any issues.