Why Are Heatsinks Fans Designed To Run Faster Than Others?

  1. Kamryn's Avatar
    Posts : 16
    Windows 10: Pro (x64)
       #1

    Why Are Heatsinks Fans Designed To Run Faster Than Others?


    I bought a fan that runs 2400 RPMs.
    My other fan run at least half of that. What is the purpose for the different speed designs?
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  2. bobkn's Avatar
    Posts : 2,121
    Win 10 X64 Pro 1809 17763.55
       #2

    Different air flow.

    Higher air flow may come at the cost of increased noise.
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  3. DooGie's Avatar
    Posts : 5,820
    Wndows 10 x64 Pro version19H1 18362.53
       #3

    Kamryn said: View Post
    I bought a fan that runs 2400 RPMs.
    My other fan run at least half of that. What is the purpose for the different speed designs?
    Generally fans with a higher RPM cool better and faster. However as bobkn said the higher the rPM the noisier they are.
    Is the fan for your case or CPU ?
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  4.    #4

    Bigger fans can run slower and less noise
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  5.    #5

    Depending on what specific fan you bought, you may be able to control its speed in your BIOS.

    That Antec case takes 120 mm fans and they can typically make a pretty good racket at 2400 rpm, but are often nearly inaudible at 1000 rpm or less.

    Whether you want to lower the speed depends on the resulting internal temperatures as well as your obsession with temperatures. Some folks get highly concerned about temps and would rather have a 35 degree temp with a noisy 2400 rpm fan than 40 degree temps with a quiet 1000 rpm fan. Nobody knows what you would prefer in that situation.
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  6. Posts : 1,186
    Windows 10
       #6

    Heatsink fans require a greater pressure to push air through the closely packed cooling fins. This is provided by higher speed fans.

    Case fans requirement is for shifting large volumes of air, not so much pressure is needed. Lower rpm fans also generate less noise.

    Obviously there are variations in designs of Heatsinks and Cases, but that is basically the general principle.
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  7.    #7

    Samuria said: View Post
    Bigger fans can run slower and less noise

    I agree, especially if the case has a good airflow and sound insulation. One wouldn't even need 1,000 RPM and still cool and quite:

    Click image for larger version. 

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    This is from a system I built two years ego, without HDD, just M.2 and SSD drives. Ambient temperature is 70 degree and the person using it cannot hear the system running.
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  8. jimbo45's Avatar
    Posts : 7,161
    Windows / Linux : Centos, Ubuntu, OpenSuse
       #8

    Hi folks

    Simple physics -- Sufficient airflow through the system will cool it enough.

    I'm just at a loss with today's millenials in schools -- perhaps too much Banking knowledge and not enough basic science.

    The only criterion on cooling is that so long as the airflow is sufficient - then whatever it takes to achieve it is OK -- whether a huge 100 km system moving at 0.00001 km/ hr or a 0.001 system moving at 1000,00 km/sec doesn't matter so long as the air flow is sufficient to cool the relevant systems.

    I'm an an old school type Engineer from the late 60' / early 70's so I despair if any engineering systems are understandable to the current crop of Millenials !!! .

    They are good for other things like marketing / games etc but Engineering -- No Thanks guys.

    Cheers
    jimbo
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  9.    #9

    jimbo45 said: View Post
    Hi folks

    Simple physics -- Sufficient airflow through the system will cool it enough.

    I'm just at a loss with today's millenials in schools -- perhaps too much Banking knowledge and not enough basic science.

    The only criterion on cooling is that so long as the airflow is sufficient - then whatever it takes to achieve it is OK -- whether a huge 100 km system moving at 0.00001 km/ hr or a 0.001 system moving at 1000,00 km/sec doesn't matter so long as the air flow is sufficient to cool the relevant systems.

    I'm an an old school type Engineer from the late 60' / early 70's so I despair if any engineering systems are understandable to the current crop of Millenials !!! .

    They are good for other things like marketing / games etc but Engineering -- No Thanks guys.

    Cheers
    jimbo
    Should have seen fan on my old AMD FX processor OEM cooler, 5700rpm of 70mm fan. Had a feeling it would take off at any moment.
      My ComputersSystem Spec


 

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