loudness of the fans

Posted on 2005-05-03
Last Modified: 2013-11-10
Hello, my Compaq Presario is much quieter than my Dell Dimension. I know it's because of the fans, but just wondering why? Does Dell have crappier fans? Or do those fans run faster? Or does it have anything to do with ACPI? Why?
Question by:uxlin
    LVL 6

    Accepted Solution

    Hi uxlin,

    Not all fans are created equal.  Some are louder than others, but it doesn't mean they're crappy - they could be louder and moving more air.  Higher speeds also mean louder noise, but it usually also means more airflow.  It all depends on what the company feels is more important (silence vs. airflow).  High quality fans can be quiet AND move a lot of air, but they cost a lot more.  Since people usually shop for cheaper computers, larger companies seem to skimp on the little stuff like fans.

    Harddrives are also a source of noise in computers, but most likely the noise from the fans in your system is drowning them out.

    Check out for info about making your computer(s) more quiet.

    LVL 5

    Assisted Solution

    Not all fans push the same amount of air either... usually the more noisy fans are because more air volume is going through and keeping the computer cooler... or, it may not be a ball-bearing fan or other things.

    You'll want to make sure nothing is blockign the aiflow... this can cause additional noise... or... check up on quiet fans. (typically slower RPM fans and different heatsink combinations..etc)


    Assisted Solution

    What you can do is to check if the heat sinc is clean. the heatsinc in most dell dimension systems are under a shroud. there would be times that the dirt in between the fins are creating the noise. you may want to clean it with a can of air. It would be a good idea to clean the vents.

    NOTE: Make sure to disconnect ALL the cables at the back. Do this at your own risk.

    hope this helps
    LVL 4

    Assisted Solution

    Greetings Uxlin!

    I have come across a lot of situation like this. Check if there is an update for the BIOS. The computer manufacturers will have known issues with few computer models. They might have released an updated BIOS.

    You can also reinstall Power Management if you are using Windows XP.

    To reinstall Power Management in Windows XP, follow these steps:

    1. Click Start, select Control Panel, and then choose Performance and
    2. Click the System icon to open the System properties window.
    3. Select the Hardware tab and click Device Manager.
    4. Click the plus (+) sign next to System Devices.
    5. Right-click the ACPI Fixed Features button and select Uninstall.
    6. Restart the system.

    On restarting the system, Windows will automatically detect and install Power Management on the computer.

    If the sound still exsist, reinstall Windows and this will narrow down the issue with hardware, then you can check the fan.
    LVL 1

    Author Comment

    Thank for all your replys.

    The thing is, my Compaq is at least 20 times quieter and over the 2 years have absolutely no problem at all. I got my Dell computer yesterday, so I'm pretty sure it's clean and up-to-date.

    It's all right with me if the Dell NEEDS to have its fans to run at that speed/noise level to ensure system stability etc. However, if the Dell computer can run at the noise level of the Compaq and have the same stability, it'd be much better.

    By the way, my Compaq is Presario S5000NX and Dell is Dimension 3000. And when running Linux and Dos, the Compaq happens to be as noisy.

    I'm going to run your methods and hope they will work.:-D
    LVL 4

    Expert Comment

    Presario S5000NX is a nice computer to work. Since the Dell is a new computer then I think it is designed to be like that. But 20 times is a matter that cannot be ignored. Check if the fan noise is even more louder in standby mode. Also check if the computer is set to Always ON. Change it to Home/Office desk in Power Options in Control Panel.  
    LVL 1

    Author Comment

    I found out why - Dell has a HUGE cpu fan. One that's bigger than the computer fan and sucks air directly out of the computer.

    It's crazy, tough I don't know why is that necessary.

    The Compaq has Celeron 2.5G and the Dell has Celeron 2.66G.
    LVL 4

    Expert Comment

    Thank you for the input uxlin. Atlast you found the answer!

    Expert Comment


    I've got a Dell 4700c purchased last December with a Pentium 4, 3.4 Ghz clock, running XP-Pro.  

    Shortly thereafter it started to have very loud fan noise - kinda like an Airbus tasking off.

    Contacted Dell support, and after the usual dithering, they installed a new fan - a much more robust device with cooling coils in addtion to the fan.  

    The cooling fins on the old fan where clogged w dust, causing the fan to constantly run  at high speed.

    The new fan nicely solved my noise problem.


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