The various components of a computer system such as the chipset, the graphics card and the hard drive can produce a large amount of heat while operating. This large amount of heat may be harmful for the proper functioning of the system. The fans are responsible for dissipating this heat and maintaining the safe temperature limits. Different processors have different operating temperatures. Higher the speed of the processor, the better the fan need to be. The chassis type is also important as it defines the housing of the assembly and compatibility with the system.