The radiator, when combined with one or more fans helps to conducts heat energy from the fluid in the watercooling loop into the air away from your PC. The larger the surface area the more effective the cooling, although some radiators are so thick they will only perform well with special fans that have a very high static air pressure to move air between the fins of the radiator. The radiators in this category require at least four 120mm fans to cool adequately.
