The fan speed switches on the front panel are already connected to the pre installed fans. Do I need to plug these into the mobo somehow or are they okay plugged into the switches alone? There is a double-sided plug that goes up to where the USB ports and fan speed switches are on the front panel. It has four prongs inside on one side,and on the other side it has 4 holes that prongs would go into. Is this for the power supply?