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First WC Loop - PWM Fans / Splitter PCBs and more! - Page 3

post #21 of 26
There are 4 pin PWM Corsair SP120s.
post #22 of 26
Then they will operate as described.
Looking on their site I see them, that wasn't what was in the case(s) I bought.
They do a really nice job pushing air through AlphaCool's 80mm radiators.
post #23 of 26
Quote:
Originally Posted by old geek View Post

The Corsair SP120's are not 4-Wire PWM fans, they are 3-wire.
The 3-Wire PWM method is different, in that case the drive voltage is a modulated square wave.
The 4-Wire PWM you have power, ground, tach and pwm. The PWM signal is only control. If you loose the PWM control signal these devices usually run at 100%.

Both methods can be affected by the number of devices connected.
I use these bad boys, they control fine with analog voltage regulation.

btw - if you look at the some of the silencer solutions packaged with a lot of the fans ( silverstone fans come to mind ) they have a 5-VDC / 7-VDC / 12-VDC plug attached to a single 4-pin molex connector. If you look closely you will notice that the 5-VDC (red) and 12-VDC (yellow) wires are common to the 7-VDC connector. This is due to 12 - 5 = 7-VDC.

Yes, I am fully aware of the difference between 3 and 4 pin fans.
The '3 pin PWM' you are refering to must br the Lamptron method.
It's similar to PWM, but it's not PWM.
And some SP120 fans are 3-pin, while some SP120's actually are 4-pin PWM fans.
Those are the ones I was referring.to.
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post #24 of 26
Quote:
Originally Posted by old geek View Post

Then they will operate as described.
Looking on their site I see them, that wasn't what was in the case(s) I bought.
They do a really nice job pushing air through AlphaCool's 80mm radiators.

Please look it up.
The SP120 PWM fans don't like to share the PWM signal between more than 4 fans.
Put 5 or 6 on the same PWM wire and they will run full speed all the time.

Furthermore, I don't know what's the signal strenght of PWM, but when you split it between fans, it does weaken the signal. The frequency and voltage of the signal will stay the same across all the fans, but the amperage and wattage gets split up. You can't indefinately split the signal forever.
Edited by PepeLapiu - 3/22/14 at 9:07pm
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post #25 of 26
yes pepe i had a brain fart trying to get it all typed out before you came in and my typing wouldve been for naught. 12v top and 5v bottom. hook em to the same pole, wouldnt be a point.
my vantec nexxus fan controller is also a pwm style voltage controller. pretty nice as there is no energy being converted into heat.
3pin fans are the easiest way to go for rad fans. there are very few pwm controllers that allow you to control fan/pump speeds based on water temps. controlling rad fans based on cpu temps is pointless and a waste of pwm tech/money.
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w00t
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wd  asus dvd multi-write arctic cooling freezer 64 pro win 7 ultimate x64 
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post #26 of 26
Thread Starter 
Thanks very much guys, some great information here, time to get researching these switches. I'll surely be back with more questions in a month or so when it comes time to start building!
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