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PC Hardware forum

Question

Do fans speed up automatically?

by lskdjfslkjf / May 12, 2012 10:26 AM PDT

Hi all, I am planning on building a PC and I was wondering...
Do fans inside a PC speed up automatically? I have a laptop that has fans that will speed up when I play a game or watch a movie, but do I have to install a heat sensor or something? Or should I get a fan controller?
Thanks!

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All Answers

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Answer
Fans come in many flavors
by Steven Haninger / May 12, 2012 10:46 AM PDT

Only those with the proper circuitry to adjust speed to temperature will change speed automatically. CPU fans rely on temperature feedback from the CPU itself to adjust speed. There are some motherboards with case fan ports which can used speed governed fans. You can also buy fans with speed selector switches to adjust the fan manually. There are also remote controlled fan speed options so I'm afraid there's no one answer to your question.

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Is there anything wrong with having one speed fans?
by lskdjfslkjf / May 13, 2012 6:14 AM PDT

Thanks for the helpful reply! I only have one more question... Is there anything that could go wrong with having fans that only spin one speed? Sound most likely won't be an issue for me.
Thanks

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Nothing wrong with that at all
by Steven Haninger / May 13, 2012 7:47 AM PDT

as long as it moves enough air to keep the insides cool. I'm not a gamer and prefer the quiet so I have case fans with switchable speed and let the CPU fan adjust as needed. If you don't mind the noise, single speed fans are less expensive and don't cause harm.

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