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Thread: 120 mm fan replacement: max air flow, max air pressure or balance?

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    Quote Originally Posted by Tator Tot View Post
    Or you have blades of varying size and geometry like Silverstone's AP123, which has 9 blades, not a prime number.

    Fascinating how there are 3 different blade types; so the repetition is still prime, namely 3 (9/3)
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    Last edited by ashiekh; 07-16-2018 at 09:58 AM.

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    Quote Originally Posted by ashiekh View Post
    Fascinating how there are 3 different blade types; so the repetition is still prime, namely 3 (9/3)
    Not exactly. It may be so in the mathematical sense; but acoustically, the blades are using different edge length, shape and effective attack angle. They are all slicing through the same wake/turbulence field so you can't really observe them as three separate groups, even though that's how they're arranged. There is a dithering effect on the sound the blades make, which indeed contains three distinct peaks, but they're not as clear and they're spaced apart so that the brain perceives their relative frequency difference as the primary sound frequency.
    Careful what you wish for... You just might get it.

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    Quote Originally Posted by ashiekh View Post
    Fascinating how there are 3 different blade types; so the repetition is still prime, namely 3 (9/3)
    It probably matters more that the number is odd, it doesn't have to be prime as evidenced above.

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    The 9S1212H401 is still available at Newark for $11.74, which is a great price for that fan. In case you are not familiar with the series, Seasonic used them in their Gold and Platinum PSU's for years. If you are outside the US, Farnell.com is part of the umbrella corp. that includes Newark.
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    Or get an EVGA 500 BR supply with postage for $20 (as pointed out by mazeroth)

    https://www.evga.com/products/produc...100-BR-0500-K1

    I have had sleeve fans fail when new, but never after oiling; so I'm somewhat undecided about them.
    Last edited by ashiekh; 07-16-2018 at 07:04 PM.

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    Quote Originally Posted by ashiekh View Post
    Or get an EVGA 500 BR supply with postage for $20 (as pointed out by mazeroth)

    https://www.evga.com/products/produc...100-BR-0500-K1

    I have had sleeve fans fail when new, but never after oiling; so I'm somewhat undecided about them.
    The San Ace is cheaper -- with shipping. Considering the price is less than half of the regular price, it's a bargain. Besides which, San Ace fans are the Cadillac of fans, where who knows about EVGA fans?
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    A whole power supply for the price of a fan... the world has gone crazy.

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    Quote Originally Posted by ashiekh View Post
    A whole power supply for the price of a fan... the world has gone crazy.
    You're also comparing a top of the line product to a heavily discounted budget product. Not exactly apples to apples in that regard.

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    Hm, even if the rebate were available in my country, I wouldn't replace my Delta-build unit with a low-end EVGA, to be honest.

    I do have a question about Sanyo: their product catalogue features all sort of PWM models in detail, yet the 9S1212P4M011 seems to have been omitted from anything but the complete part numbers list. What's the PWM curve like? Probably >=800 rpm at 10% duty cycle, I reckon?

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    Quote Originally Posted by Fan-tastic View Post
    I wouldn't replace my Delta-build unit with a low-end EVGA, to be honest.

    I'd oil the fan and use Japanese secondary capacitors.

    I know that many here would not agree, and I'm fine with that;
    it's just that this approach works well for me.
    Last edited by ashiekh; 07-17-2018 at 12:54 PM.

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