Furiousdogs

Hi I have read that the Corsair H75 is a good unit for the Alienware Aurora R8. It seems that a lot of people use only one fan from the H75 on the radiator and then use the 2nd fan to replace the front fan the Alienware unit comes with. Does the radiator need both fans and is it a good idea to do it using one on the radiator and one to replace the fan from the unit?