I am having the similar problem with you and my board is ASUS P8H77-M PRO. Did you finally solved the problem? Asus support is lazy on this issue.
Some other people is also experiencing the same problem here...
I installed 4x4GB Corsair CMZ8GX3M2A1600C9 memory to the board and it only recognizes half of them. Does anybody know how to solve this issue? The support for Asus is lazy.