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For the overclocker and case modder, fan noise is nothing new. This is the price that must be paid when one wants to obtain maximum cooling for their computer hardware. To overcome this, the fanbus/baybus was invented, to not only centralize fan wiring within the inside of a PC, but also to lower noise by allowing fans to be turned off when extra cooling was not needed. One probably doesn't need a >100CFM fan running while just listening to MP3s, and the noise from such a fan would probably detract from the musical experience. Soon, rheostats began to be used for fan control, as they were able to provide a variable resistor in the circuit that effectively was able to control fan speed, so instead of just being have on/off control, one could regulate the fan's speed with a reasonable degree of accuracy.