CountMike is right. But there are also other factors to get it to work. Those depend on what your mobo can do, and on what type or fans you have. So that we can look up their details and give you exact advice, tell us for BOTH your mobo and your fan(s), PLUS for whatever CPU chip cooler system you have:
Maker
Exact Model Number
Also tell us exactly where each fan is connected. If it's on a header of the mobo, tell us which one(s).
IF you cannot get the model number from the fan(s), at least tell us this. Look at the wires from the fan motor out to its connector on the end. There may be THREE wires with 3 holes in the connector, or FOUR wires and holes. There are also a few less conmmon systems, so if it's not one of those, describe as best you can.