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Thread: Best 80mm 2 wire 12V fan

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    Default Best 80mm 2 wire 12V fan

    Hopefully this is not considered an obsolete question, but what is felt to be the best 80mm 2 wire 12V fan for rebuilding old power supplies?

    Only really interested in 25mm depth, and low noise units; LED lights not desirable.

    3 wire will do, just leave out the yellow/white speed sense wire
    Last edited by ashiekh; 06-12-2018 at 11:42 AM.

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    As far as the outright "best", money is no object you would want to look at the Noctua NF-A8 or Silverstone FQ81. Both are technically PWM fans but can be run with a voltage controller and no issue.

    On the other hand, they're like $15/fan and do not push a lot of air as they top out on the low side of 80mm fans around 2500 RPM or so. If you have a more efficient unit that's got a more open layout that's not really an issue but some of the older and more jammed up units will definitely choke.



    With that said, you can still pick up Delta AFB0812SH units pretty cheap on Ebay, or if you need to buy a ton through sources like Digikey/Mouser.

    These are 2BB 80mm 4k RPM fans, they're not exactly "quiet" but they do start up at 4v so if the voltage controller is decent they shouldn't be too loud for an 80mm part.

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    How about the Noctua NF-R8, they come in both 1200 and 1800 rpm versions (non PWM) and $10 each

    The
    NF-R8 1800 is 31 CFM (about the same as the NF-A8 2200 you suggested)
    NF-R8 1200 is 21 CFM
    Silverstone FQ81 28 CFM
    Delta AFB0812SH 47 CFM

    Amazon have an Evercool as a power supply replacement at 32 CFM

    I opened up one of my old power supplies and it has a Sunon fan 41 CFM


    so I am guessing something around 30-40 CFM; this helps a lot, many thanks
    Last edited by ashiekh; 06-12-2018 at 12:19 PM.

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    The old Noctua SSO bearing isn't much better than a standard sleeve bearing and those bearings tend to get leaky over time. Since a good 2BB is around the same price, I would suggest that instead.

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    Again much appreciated; I was a little concerned with rattle developing with time as the ball bearings wore.

    So the new (SS02) Noctua bearing is so much better than the old (SSO); now that I think on it, how do they keep hard drive (fluid) bearings lasting so long?
    Last edited by ashiekh; 06-12-2018 at 10:03 AM.

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    Quote Originally Posted by ashiekh View Post
    Again much appreciated; I was a little concerned with rattle developing with time as the ball bearings wore.

    So the new (SS02) Noctua bearing is so much better than the old (SSO); now that I think on it, how do they keep hard drive (fluid) bearings lasting so long?
    Hard Drives pretty much exclusively use Fluid Dynamic Bearings but specifically those that adhere to the patent design and the latest revisions of said design. They completely seal the oil chamber, and use a new fluid which has better heat resistance, takes longer to evaporate, etc.



    Noctua's SSO bearing is basically a sleeve while SSO2 is them making an FDB but skirting around patents.


    Also, Ball Bearings still use a lubricant. You can add oil to a ball bearing over time as they start to develop time and they'll last so much longer than any sleeve.

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    Quote Originally Posted by Tator Tot View Post
    Hard Drives pretty much exclusively use Fluid Dynamic Bearings but specifically those that adhere to the patent design and the latest revisions of said design. They completely seal the oil chamber, and use a new fluid which has better heat resistance, takes longer to evaporate, etc.



    Noctua's SSO bearing is basically a sleeve while SSO2 is them making an FDB but skirting around patents.


    Also, Ball Bearings still use a lubricant. You can add oil to a ball bearing over time as they start to develop time and they'll last so much longer than any sleeve.
    Do the cheapest hard drives (Barracuda Desktop, WD Blue, etc...) also use those bearings? Is there anyone out there checking the quality of various models? And happy birthday!!

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    the good old be quiet Silent Wings isn't available??

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    Default

    9000 rpm
    93 CFM
    12W

    That will keep the supply cool; but how do I keep the computer from wandering across the room?
    Last edited by ashiekh; 06-13-2018 at 12:07 AM.

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