I have a LGA 1156 motherboard of which all supported cpus have a max ram MHz of 1333 but I have 8gb of 1600MHz installed along side 4gb of 1333MHz. Windows says that 12Gb is installed but only 4gb usable (Btw it's a 64-bit) do I need to underclock specifically the 8gb to match the 4gb? and if so how?