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Thread: Fan bearing

  1. #11
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    Quote Originally Posted by ashiekh View Post
    And .... that leads to another question.

    are ceramic bearings being used in some ball bearing fans? either hybrid or full ceramic.
    Quote Originally Posted by Jon Gerow View Post
    Noooooooooooooooo............ these are PSU fans. Not bicycle bottom brackets.

    Not entirely true. Someone came to market with some ceramic bearings a few years ago under a custom name. I'll see if I still have the documents saved somewhere but I remember them flopping pretty quickly. This was probably somewhere in the middle of the Gentle Typhoon craze.

  2. #12
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    Ceramic sleeve bearings; 300,000 hrs
    http://ceramicafans.com/

    I mentioned these way back when
    http://www.jonnyguru.com/forums/show...15235-Ceramica

    but here I was wondering about ceramic ball bearings (although sleeved might be better).


    Now I begin to wonder about underclocking, by halving the speed one might be able to cut the power consumption to an eighth; if so one might be able to do away with fans entirely.

    As I understand it

    P ~ V2 f and f ~ V

    Where P is power, V is voltage and f is frequency; putting this together one gets

    P ~ f3

    so the power goes down very quickly with underclocked frequency (if one is lowering the voltage along the way)
    Last edited by ashiekh; 08-07-2020 at 10:34 AM.

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    Quote Originally Posted by ashiekh View Post
    Now I begin to wonder about underclocking, by halving the speed one might be able to cut the power consumption to an eighth; if so one might be able to do away with fans entirely.

    As I understand it
    P ~ V2 f and f ~ V

    Where P is power, V is voltage and f is frequency; putting this together one gets
    P ~ f3

    so the power goes down very quickly with underclocked frequency (if one is lowering the voltage along the way)
    I think you're mixing your threads up now.

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    Quote Originally Posted by Jon Gerow View Post
    I think you're mixing your threads up now.

    Other one was about over-clocking; this one is under-clocking.

    Still wanted the cubed relation, which for me is not obvious without the steps that included the V​2 for resistive heating
    Last edited by ashiekh; 08-07-2020 at 10:36 AM.

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    Quote Originally Posted by ashiekh View Post
    Other one was about over-clocking; this one is under-clocking.
    No. This one is about fan bearings.

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    Sorry `bout that, my mind was off on the line of thought that maybe in the future one could avoid fans; I know, it was quite a stretch.

    But it does lead to the strange idea that two mining cards at half speed would be as powerful as one at full speed but only consume a quarter the energy;
    I assume that in mining the major part of the cost is in electricity, so this might be a direction to explore. Of course this seems to go against current wisdom.

    Perhaps I should have opened a new thread.
    Last edited by ashiekh; 08-07-2020 at 02:24 PM.

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