You only need one. The cool thing about the fan is that it has an integrated fan hub. So the three fans can be connected directly to the radiator and then with a cable to a pwm header.
Good afternoon. This AiO is already pre-filled and ready for use. Only in the case of an extension, which is possible with this cooling system, should an expansion tank be connected.
hey failmasterz! http://www.thermaltake.com/products-model_Specification.aspx?id=C_00002974 gemäss den Specs müsste sogar ein 1x560mm Radiator Platz haben ;).