PC Case rear fan

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  1. Posts : 291
    Vista/Windows 7
       #1

    PC Case rear fan


    I just finished building my new PC and for the rear fan on the back I used my old fan from my old machine. After turning my machine on the fan blows at full force and doesn't stop and its really noisy...it sounds like a vacuum cleaner or a plane taking off lol
    I disconnect the fan and the noise stops...is there a way to control the speed or should I get a new fan altogether?

    I was looking at this one from ebyer: Antec 80mm Smartcool Thermally Controlled Case Fan - Ebuyer
      My Computer


  2. Posts : 568
    Win7 x64 Ultimate SP1
       #2

    Are you connecting the fan to one of the fan connections on the mother board?
      My Computer


  3. Posts : 9,582
    Windows 8.1 Pro RTM x64
       #3

    Hi burtie,

    What size rear fan can your case actually accommodate? If it can take a 92mm or a 120mm fan then use one of that size. Its larger size means that to shift the same amount of air as an 80mm one, it doesn't need to spin as fast. This reduces the noise.
      My Computer


  4. Posts : 291
    Vista/Windows 7
    Thread Starter
       #4

    I plugged it in to SYS_FAN header on the mobo. My case can only accommodate 80mm.
      My Computer


  5. Posts : 568
    Win7 x64 Ultimate SP1
       #5

    burtie, most mobo's control the fan speed based on CPU or chip temperature.
    Try running 'speedfan". and see if you can set the speed settings.

    Ken
      My Computer


  6. Posts : 13,354
    Windows 7 Professional x64
       #6

    My BIOS has a place to change the fan speed. Maybe that's worth looking into.
      My Computer


  7. Posts : 568
    Win7 x64 Ultimate SP1
       #7

    Burtie, it might helpful if you filled it your system specs os we know which mobo you using.

    Ken
      My Computer


  8. Posts : 983
    10 x64 | 7 x64
       #8

    Just thinking the SYS_FAN header is 4 pin but if the fan is 3 pin could force it to run full speed. You might need a 3rd party controler that feeds off a molex. Newegg has jazz like that.
      My Computer


  9. Posts : 291
    Vista/Windows 7
    Thread Starter
       #9

    I have a Gigabyte S-series motherboard GA-G41M-ES2L
    GA-G41M-ES2L (rev. 1.0) - GIGABYTE - Product - Motherboard - Specification

    The manual says it has a 4 pin CPU fan header and a 3 pin system fan header.

    Would I need a connector like this if I were to buy a 4 pin fan? 4-pin Molex to 3-Pin Female Socket Cable Adapter Sleeved [4FAN3PIN] : Performance-PCs.com, ... sleeve it and they will come

    I was also thinking maybe of getting a quiet low noise fan. Would anyone have any suggestions? It doesn't have to be powerful just enough to vent the warm air from the back. I also have room at the front for another small fan and was thinking I could use another quiet one to suck cold air in, would that be more beneficial? How would I connect 2 fans if I only have one header for a system fan?

    Thanks for your help :)
      My Computer


  10. Posts : 1,170
    XP Pro SP3 X86 / Win7 Pro X86
       #10

    burtie said:
    I was also thinking maybe of getting a quiet low noise fan. Would anyone have any suggestions? It doesn't have to be powerful just enough to vent the warm air from the back. I also have room at the front for another small fan and was thinking I could use another quiet one to suck cold air in, would that be more beneficial? How would I connect 2 fans if I only have one header for a system fan?

    Thanks for your help :)
    All fans make noise... the question is how much....

    Ball bearing fans make more noise than sleeve bearings.
    Bigger fans spin slower and make less noise.
    Older fans often have wear in their bearings and make more noise.

    Look for fans with "hydro dynamic" bearings. The shaft floats on a layer of oil inside a nylon bushing and the only thing you hear is airflow. Some of the better ones are these...

    Newegg.ca - GELID Solutions Ltd.,case fan.

    Newegg.ca - Rexus,case fan

    I've always had good luck with the Rexus. They used to be Panaflo and I still have a couple of Panflo fans that have been running day and night for nearly 10 years.

    Another trick you can use, if you feel like a little DIY, is to put a 10ohm 2 watt resistor in series with the red lead of the fan... a quick snip, a little solder, some heat shrink (or tape) and you have a fan spinning about 75% of full speed.
      My Computer


 
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