My board is a MSI 970A-G46 and i have 4 sticks of 2gb patriot G2 ram, one stick died and is causing blue screens, it's a dual channel board, and i currently have 2 sticks (4GB) installed....would it benefit me to add the 3rd stick for a total of 6GB? do i have to change the settings in bios from dual channel to single on the single slot?