At first glance, it seems you have the right CPU with the MSI 970A-G46 motherboard.
I do see where MSI has newer Bios for that board, version 2.6, as of 10/30/2013. Have you "Flashed" the Bios to update yet? I see they have something called a "Live Update 5" system to help in updating the Bios.
In the
FAQ for that board, there is a question regarding not getting 1600Mhz memory to run at its proper speed unless you go into the Bios and change a parameter. Just this kind of thing that
MAY make a difference.
Have you used their "Control Center" utility to check the inner workings of the computer?