How do the OEM people make there computers so quiet?

So how do the OEMs make there computer's fans so quiet. Some of them you can hardly tell they are on. And you can here the fans a max for like 1 second after you turn them off then something kicks in and they slow down.
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  1. Best answer
    If you're talking about places like Dell and HP, it's because they can engineer to a specification and place cooling exactly in the right place to reach a temp that they have already decided was acceptable. They can even setup their motherboards to have components in a place for optimal cooling. so they don't over-engineer a cooling solution. They also have the capability to engineer their cases to be sound absorbent and their fans always have PWM and temp limits and steps have been engineered and probably hard coded into the bios. they also don't overclock and tax the cooling system (or the PSU, whose fan and temp sensors are also related to the cooling system). The "OEMs" that overclock are usually very conservative and they use off the shelf parts so they are not as quiet as something from Dell or HP.
  2. hmm that sounds interesting

    So the software that maintains the fan's speed and components temp is built in on the motherboard?
  3. Best answer selected by catsrules.
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