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The [Official] Noctua Club - Page 208

post #2071 of 3060
Quote:
Originally Posted by xXx1990 View Post

If one of my fans is connected to a 3 pin header would I still be able to controll it from the bios fan settings?
PWM fans can usually be controlled with variable voltage, but not as well as with PWM.
post #2072 of 3060
Quote:
Originally Posted by doyll View Post

Originally Posted by xXx1990 View Post
If one of my fans is connected to a 3 pin header would I still be able to controll it from the bios fan settings?
you'll' have no PWM/degree option, but I remember my old z77 ext4 had 9 levels for the fan connected to 3-pin. It seems to me you can control it in BIOS, but it'll always run at fixed speed and won't be variable at all.
post #2073 of 3060
Quote:
Originally Posted by doyll View Post


PWM fans can usually be controlled with variable voltage, but not as well as with PWM.

Why is PWM better than DC voltage control?

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post #2074 of 3060
Quote:
Originally Posted by twerk View Post

Why is PWM better than DC voltage control?
You have wider range to control RPMs.
My NF-A14s work smooth between 10% and 100% PWM that gives 150-1500 RPM respectively.
Show me voltage controlled fan that will work in such range.
post #2075 of 3060
Quote:
Originally Posted by Klocek001 View Post

you'll' have no PWM/degree option, but I remember my old z77 ext4 had 9 levels for the fan connected to 3-pin. It seems to me you can control it in BIOS, but it'll always run at fixed speed and won't be variable at all.
True, no PWM% to degree option,
but
depending on motherboard most likely have voltage/ fan speed to degree option.

Not graduated into as many different speed, but good enough.
Quote:
Originally Posted by twerk View Post

Why is PWM better than DC voltage control?
What dzb87 said. thumb.gif

PWM = simply controlled pulses of 12v power = no heat
Variable voltage = reducing 12v to lower voltage = heat
PWM = full power (12v) every pulse = more torque from motor at low speed = keeps spinning at lower speeds
Variable voltage = reducing voltage = less power / torque = motor stalls / quits running.
PWM give almost infinite speed adjustment
Variable voltage is usually only 3-7 different speeds.
PWM is more energy efficient because is either on or off
For variable voltage to lower voltage uses transformers / resistors to lower the voltage .. changing the voltage to heat

Edited by doyll - 10/2/15 at 7:47am
post #2076 of 3060
Quote:
Originally Posted by dzb87 View Post

SubnavYou have wider range to control RPMs.
My NF-A14s work smooth between 10% and 100% PWM that gives 150-1500 RPM respectively.
Show me voltage controlled fan that will work in such range.

Also you loose much less energy with a PWM, because you are not burning it in heat on a resistor.

Btw first post here, hi everybody!
post #2077 of 3060

Alrighty thanks guys! Makes me regret buying my NF-A14 FLXs now...

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Hard DriveHard DriveCoolingCooling
Samsung 840 Pro 256GB Crucial MX100 512GB Noctua NH-U14S 3x Noctua NF-A14 FLX 
OSMonitorMonitorKeyboard
Windows 10 Pro 64-bit Dell U2713HM Dell U2312HM Ducky Shine 3 Year of the Snake (MX Brown) 
PowerCaseMouseMouse Pad
EVGA SuperNOVA P2 650W Fractal Design Define R5 Black Mionix Naos 7000 SteelSeries QcK 
AudioAudioAudioOther
Sennheiser HD 650 Fostex TH-X00 Ebony Parasound Zdac TP-LINK Archer T9E  
CPUGraphicsRAMHard Drive
Intel Xeon E5-2620 v4 @ 3GHz Matrox G200eH2 4x8GB Kingston Dual Rank ECC DDR4 @ 2133MHz 2x Samsung PM863 120GB in RAID1 
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post #2078 of 3060
Quote:
Originally Posted by twerk View Post

Alrighty thanks guys! Makes me regret buying my NF-A14 FLXs now...
for case air cooling . is NF A-15 or NF-P14s redux-1500 PWM looking for the best 140mm fans for case air cooling
post #2079 of 3060
"some" noctua stuff here also smile.gif
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post #2080 of 3060
Rad used was an EK CE140mm

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