Scythe new silent fans

Discussion in 'Overclocking, Cooling & Modding' started by PowerSlide, Jan 16, 2006.

  1. PowerSlide

    PowerSlide Just Started

    Last edited by a moderator: Jan 16, 2006
  2. Olle P

    Olle P Newbie

    Better to get the 21F and run it at 6V to get the same result, but have extra performance to spare when needed.

  3. Chai

    Chai Administrator Staff Member

    The bearing and motor could be different, that makes all the difference to silent freaks. :p
  4. Olle P

    Olle P Newbie

    I bet it's just the motors that differ, which in turn provide different speeds at the same voltage.
    Since everything else is the same and performance/speed thus is directly proportional to the voltage (within limits) then a voltage adjustment is all it takes!

    (The noise is proportional to the speed^5.)

  5. Chai

    Chai Administrator Staff Member

    Not really. Even motor generates noise on its own, regardless of fan speed. So noise is not proportion to the speed, especially at very low speed. Fan turbulence is not the major factor anymore.

    Instead of the noisy whirling noise, the motors generate noises like 'tik tik' etc.
  6. Papercut

    Papercut Newbie

    Those are fairly impressive specs. I hope they're not exaggerated like some other companies'.
  7. Olle P

    Olle P Newbie

    You're correct of course, but that doesn't allow for a correct assumption of engine and bearing noise at other than rated speeds either...

  8. Chai

    Chai Administrator Staff Member

    Could is the key word. :p
  9. PowerSlide

    PowerSlide Just Started

    seriously..i dun have a clue wat u guy toking :haha:

    wen i shop for fans jus see the cfm n dBa rating..tats it :p
  10. aKho

    aKho beat around the bush

    i duno much about cfm n dba..i just do it the old fashion way, physically testing it out.. :mrgreen:

    e.g. plug-in fan, wahh! not bad not bad, very strong wind, ok i buy.
  11. Chai

    Chai Administrator Staff Member

    Manufacturer's rating is not necessarily accurate, especially Thermaltake... :faint:
  12. Olle P

    Olle P Newbie

    Perhaps I should get my act together and write that fan and cooling guide I've been planning for so long... :think:

    That should explain the basic physics involved as well as how to think when planning your computer cooling solution. (Like why it's better to add than remove fans if the objective is to make the rig more quiet. :twisted: )

    I've spent quite a while studying this matter. University grade physics (dynamics, acoustics, electronics and thermodynamics are the sub-branches that mostly apply here), empirical experiments and reading/comparing fan specifications.

  13. Papercut

    Papercut Newbie

    That sounds very interesting. :thumb:
  14. Chai

    Chai Administrator Staff Member

    Yup, it is very interesting! :D
  15. goldfries


    my Scythe Ninja came with a silent 120mm fan.

    rated as.......
    Fan Noise Level: 23.5dBA
    Air Flow: 46.5CFM
    Fan Speed: 1200rpm

    looks like it's a bit lesser CFM and more dB compared to the SFF21E.

    * SFF21D -> 800 rpm, 33.5 CFM, 8.7 dB, 12 V, 0.1 А;
    * SFF21E -> 1200 rpm, 49.0 CFM, 20.1 dB, 12 V, 0.15 А;
    * SFF21F -> 1600 rpm, 63.7 CFM, 28.0 dB, 12 V, 0.2 А.

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