Cooling+System

Fans Certain computers use fans to cool them down. Some larger more important parts require a private cooling system. ( an extra water cooling tube or an extra fan )

Liquid Coooling Liquid cooling is way batter than fan cooling. and it caool way faster. It is the better kind of cooling, except it requires changing the water every once in a while. The sound level is lower, it cools things down faster, but its more expensive, and it can get dangerous when the computer gets TOO cold and when you add a little bit more or a little bit less of anti-freeze. There are lots of companies making Liquid Cooling devices ex :

Nighthawk Koolance( does watercooling for PS3's as well) Vantec ( makes fans as well ) Thermaltake ( makes fans as well ) Coolermaster ( also makes cases and others )

Quiet PC A quiet PC is a personal computer that makes little noise. To construct this type of computer, there must be some changes made in the cooling system, since cooling fans and hard drives are where most of the noise in the computer comes from. For example, a quiet PC will have fans with low-speed, large-diameter fans with low bearing and motor noise. The fans on motherboards and GPUs will have passive cooling solutions; they will be placed on anti-vibration mounts. The heat sinks, which are masses of metals that are added to a device to absorb heat, will be replaced with larger copper or aluminum ones. One problem is that water cooling is needed for a quiet operation in an energy-hungry computer. However, water pumps often make systems noisier than air-cooled, low-power computers. (Information from http://www.answers.com/topic/quiet-pc?cat=health)