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post #621 of 3105
Thread Starter 

Those aren't the same guys. The amazon ones are the NF-F12.  the Micro place are NF-P12

post #622 of 3105
I hope the 2 fans i ordered are as good as they say as I have never owned any Noctua fans, i have a corsair vengance c70 case that has a front filter that is such a tight mesh that every fan i have tried struggles to pull air through them theres mounting for 2 fans up front and the pair i have now are the new corsair SP high performance they pull air through the filter kinda good but they are 35db they are hooked to my mother board and i can control them with my asus fan xpert software but at low speed they don't pull air very good and they are designed for pulling air through radiators heatsinks and filters but at max speed they are LOUD!!! anyways i read so much about the Noctua NF-F12 i think they will be the ones that work and their only 24db at full speed which i can live with.
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post #623 of 3105
Quote:
Originally Posted by animal0307 View Post

Those aren't the same guys. The amazon ones are the NF-F12.  the Micro place are NF-P12
just saw that as i looked them up so i'm good with what i ordered
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post #624 of 3105


I have one!
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post #625 of 3105
Quote:
Originally Posted by ehume View Post

You can control a PWM fan by in essence interrupting the 12v current flow to the fan. There are/were some fan controllers that used this method rather than Voltage control. But not all fans take kindly to this. They have their own circuitry, after all.

The 4-wire fan that is designed for PWM control receives a 5v signal from a fan controller -- motherboard or purpose built controller (example). The 5v signal runs from 0 to 100% "duty." From that the fan's PCB tells it how fast to spin...

I understand this to mean that: 75% duty cycle of a 4000rpm max fan spins the fan at 3000rpm

Regarding noctua pwm fans, does their "low noise adapter" (LNA) simply limit the maximum speed of the fan, or does it change the entire operating range?

example: at 75% duty cycle of a 4000rpm fan using 2800rpm L.N.A., would the fan spin at 2800rpm (LNA max rpm) or at 2100 rpm (75% of LNA max rpm)?
post #626 of 3105
Quote:
Originally Posted by Cyril279 View Post


I understand this to mean that: 75% duty cycle of a 4000rpm max fan spins the fan at 3000rpm
Regarding noctua pwm fans, does their "low noise adapter" (LNA) simply limit the maximum speed of the fan, or does it change the entire operating range?
example: at 75% duty cycle of a 4000rpm fan using 2800rpm L.N.A., would the fan spin at 2800rpm (LNA max rpm) or at 2100 rpm (75% of LNA max rpm)?

 

The LNA / ULNA are voltage reduction cables. 

 

They cannot be used with PWM control though. So duty cycle would not apply.

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post #627 of 3105
i totally used a lna adapter with pwm control. works fine. It lowers max speed
post #628 of 3105

No, it doesn't. You need the 4th wire to communicate with the PWM IC on the fan.

 

You can apply a PWM signal to the fan by pulsing the 12v at various intervals to the fan; but in the end, the fan is still being undervolted when using a LNA or ULNA.

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post #629 of 3105
Quote:
Originally Posted by Tator Tot View Post

No, it doesn't. You need the 4th wire to communicate with the PWM IC on the fan.

You can apply a PWM signal to the fan by pulsing the 12v at various intervals to the fan; but in the end, the fan is still being undervolted when using a LNA or ULNA.

Maybe I'm misunderstanding, but it sounds like you're saying that the fourth wire is still applying a pwm signal to an undervolted fan. Would this not result in a fan that is pwm controlled at lower speeds?

pulsing seven volts should yield a slower fan speed than pulsing twelve, but it's still controlled by the pulse, no?
post #630 of 3105
Quote:
Originally Posted by Cyril279 View Post

Quote:
Originally Posted by ehume View Post

You can control a PWM fan by in essence interrupting the 12v current flow to the fan. There are/were some fan controllers that used this method rather than Voltage control. But not all fans take kindly to this. They have their own circuitry, after all.

The 4-wire fan that is designed for PWM control receives a 5v signal from a fan controller -- motherboard or purpose built controller (example). The 5v signal runs from 0 to 100% "duty." From that the fan's PCB tells it how fast to spin...

I understand this to mean that: 75% duty cycle of a 4000rpm max fan spins the fan at 3000rpm

Regarding noctua pwm fans, does their "low noise adapter" (LNA) simply limit the maximum speed of the fan, or does it change the entire operating range?

example: at 75% duty cycle of a 4000rpm fan using 2800rpm L.N.A., would the fan spin at 2800rpm (LNA max rpm) or at 2100 rpm (75% of LNA max rpm)?

Duty cycle means the percent of time the fan is receiving 5v as it switches from 0v to 5v. As for what speed it runs, that is up to the programming in the fan's PCB. Noctua PWM fans are in fact designed to run proportional to the PWM signal -- 0% duty corresponding to 0 rpm, 25% duty corresponding to 25% speed, etc. Other fans will have, say, 50% speed at 0% duty. That's actually fairly common.

Quote:
Originally Posted by Cyril279 View Post

Quote:
Originally Posted by Tator Tot View Post

No, it doesn't. You need the 4th wire to communicate with the PWM IC on the fan.

You can apply a PWM signal to the fan by pulsing the 12v at various intervals to the fan; but in the end, the fan is still being undervolted when using a LNA or ULNA.

Maybe I'm misunderstanding, but it sounds like you're saying that the fourth wire is still applying a pwm signal to an undervolted fan. Would this not result in a fan that is pwm controlled at lower speeds?

pulsing seven volts should yield a slower fan speed than pulsing twelve, but it's still controlled by the pulse, no?

Scythe has some PWM fans where you can change their speed ranges with Voltage. Deepcool fans (PWM) change their speeds when you put them on the 7v adapter, yet still respond to PWM control. No reason Noctua fans shouldn't work the same.

 

One caveat: the main Voltage has to be high enough to make the fan go. With the Deepcool fans on 7v, for example, they will not respond to PWM signals at less than 50% duty.

 

HTH.

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