Due to more usage of cpu
While working on your computer, you may notice the fan inside the computer speeding up and slowing down, often getting louder and quieter as it changes speeds. As long as the fan continues to spin and does not completely stop this is completely normal for computers, especially laptop computers. My computer is a Dell Dimension 4600. Recently I noticed that the fan in the computer seems to speed up. I notice this because, for several minutes at a time, I hear a louder than normal wooshing sound coming from the computer and then the sound dies down. This happens about 5-10 times a day. Rating Newest Oldest. Best Answer: For a very good system, that's the normal thing. the fan cools the CPU when it gets hot and once the CPU temp is okay again, the fan has to stop or reduces it's speed. I was looking at the bios to see if the cpu fan speed changes when the speed up occurs. It says the CPU fan is around 2000 RPM when I hear the fan increasing in speed (ex. sort of like reving up an engine), then when it slows down, the cpu fan speed is back to 0 RPM. But I can see the fan moving in the computer at a slower speed. Report Abuse. the fan speed is controlled by the motherboard and changes in response to CPU usage. If it cranks up, chances are you are running a program that is using a lot of the CPU. It slows down the the CPU load drops. holyhell5 · 8 years ago. When I turned on the computer today, I could tell that the fan speed was really high, but then it went really low. Every 15 minutes or so, the fan would try to increase in speed, but go back to being really slow. I believe its not the fan on top of the cpu, but the fan next to it. the fan speed is controlled by the motherboard and changes in response to CPU usage. If it cranks up, chances are you are running a program that is using a lot of the CPU. It slows down the the CPU load drops. holyhell5 · 8 years ago.
http://www.computerhope.com/issues/ch001255.htm http://www.cnet.com/forums/discussions/fan-speeds-up-is-this-a-problem-233137/ https://answers.yahoo.com/question/index?qid=20080110084348AA5h5xo http://www.techspot.com/community/topics/cpu-fan-speeds-up-and-slows-down.28199/ https://answers.yahoo.com/question/index?qid=20080110084348AA5h5xo http://www.techspot.com/community/topics/cpu-fan-speeds-up-and-slows-down.28199/ https://answers.yahoo.com/question/index?qid=20080110084348AA5h5xo
why does cpu fan speed up