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PWM fan mod

post #1 of 9
Thread Starter 
Guide: http://www.overclockers.com/high-speed-gentle-typhoon-pwm-mod


My idea is to push the yellow wire out of the male 3-pins, denude it and solder on the PCB.
I will designate the yellow cable (picture bellow) by the white cable to avoid confusion.



The gentle typhoon has 3 cables black & red current with a yellow one for the RPM.

I will take out the yellow cable on the male 3-pin from the fan to put it with the white cable (PWM) that was soldered on the PCB.

I should end up with 2x 2 wires 3-pin male, one going on the PSU and the other on the motherboard.

Just wondering if I got it right. I will have 4 of these fans, the problem is that I doubt the cables are long enough to be plugged on the mobo. I idea how I could do this? Is there anything done to control that stuff?
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post #2 of 9
It will not work.

The yellow is the rpm sensor/signal not pwm.

PWM fans are 4 wire not 3 wire... and has a special PWM circuit board in fan housing.

The 4th wire is the PWM trigger signal from PWM socket on motherboard. This signal triggers the 12v pulses to to fan motor.
post #3 of 9
Thread Starter 
Quote:
Originally Posted by doyll View Post

It will not work.
The yellow is the rpm sensor/signal not pwm.
PWM fans are 4 wire not 3 wire... and has a special PWM circuit board in fan housing.
The 4th wire is the PWM trigger signal from PWM socket on motherboard. This signal triggers the 12v pulses to to fan motor.

I think an image will help



So you got two wires (red & black) on the PSU and white & yellow (RPM sensor and I think PWM according to the guide) on the motherboard.

Given that, there is 4 wires, 2 for the current, 1 RPM & one for the PWM from what I understand...

I am not sure to exactly see what you try to say by PWM trigger signal? What does it mean?
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post #4 of 9
The wires from the fan. There must be 4 of them.

Not the molex plug which is also a 4 wire plug.... but NOT a PWM plug.

PWM
GND = Black
12v = Yellow
RPM = Green
PWM = Blue

RPM sensor to motherboard
PWM signal to fan PWM circuit board.
post #5 of 9
Quote:
Originally Posted by Just a nickname View Post

I think an image will help

So you got two wires (red & black) on the PSU and white & yellow (RPM sensor and I think PWM according to the guide) on the motherboard.
Given that, there is 4 wires, 2 for the current, 1 RPM & one for the PWM from what I understand...
I am not sure to exactly see what you try to say by PWM trigger signal? What does it mean?

Fan in your picture works fine but that one is using a 4-pin connector to motherboard header. If I understood your first post correctly you are planning to use a 3-pin connector which won't align correctly with a 4-pin motherboard header.
post #6 of 9
Quote:
Originally Posted by mm67 View Post

Fan in your picture works fine but that one is using a 4-pin connector to motherboard header. If I understood your first post correctly you are planning to use a 3-pin connector which won't align correctly with a 4-pin motherboard header.
Indeed. You need a 4 pin PWM plug or modify the 3 pin plug so you can plug it into 4 pin socket leaving the GND and 12v pins unused.
Edited by doyll - 7/24/12 at 11:33am
post #7 of 9
Thread Starter 
Sorry, probably retarded but I am a complete newbie with this stuff, just trying to understand the mod.

Here a little paint draw to explain what I was thinking doing:






Do I have to get a 4-pins with 4 wires connected to the mobo?

Also, I doubt I have enough 4-pin connector on the motherboard. Anyway to duplicate one?

Omg, don't know if I will do it, seems a bit more complex than what I though...
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post #8 of 9
You have the right idea but are still wrong biggrin.gif

First off remove the red from the 3 pin and power the fan from the molex plug

You can run many fans on a single PWM signal. I'm running 7 in my computer right now. 3x FN053 and 4x TY-140 fans. One of CPU cooler fans is master sending rpm signal to motherboard CPU_fan PWM socket. The motherboard sends PWM signal to fan splitter to all fans. Power to all fans is through molex connecters from PSU.

I'm, using Akasa and Gelid PWM splitters. Both models of fans are similar rpm ranges so PWM pulse makes them all run at similar speeds. System is set to idle at 700rpm and full load is 1100rpm with CPU 38c -60c. I can run fans faster but why should I? Faster is louder and 60c on i7 920 is cool.
post #9 of 9
Thread Starter 
Okay okay got it biggrin.gif
Sounds good, can't wait to do that mod, it is going to reduce quite a bit the noise.

+rep for yall thumb.gif
My System
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CPUMotherboardGraphicsRAM
i7-2600k Gigabyte z77x-UD3H MSI 7970 2x2Gb ECO G.skill 1600 7-8-7-24 @ 2100MHz 8-9-8-24 
Hard DrivePowerCase
Samsung F3 spinpoint Corsair 750W CM690 II 
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My System
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CPUMotherboardGraphicsRAM
i7-2600k Gigabyte z77x-UD3H MSI 7970 2x2Gb ECO G.skill 1600 7-8-7-24 @ 2100MHz 8-9-8-24 
Hard DrivePowerCase
Samsung F3 spinpoint Corsair 750W CM690 II 
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Reply
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