In contrast to overclocking, you may prefer to silence your computer. Some high-performancePCs are very loud indeed, and it is possible to reduce the noise dramatically. Note that quietercomputers sometimes run slightly hotter, so you need to monitor carefully what you do.Usually you can't overclock and silence at the same time. Main sources of noise are: Fans(CPU, case, power supply, motherboard, Graphics card), and Hard disks. One should be able tosit next to the computer, and hear birdsong from outside!