D5 PWM not working.

Cerelia

Cerelia

Cerelia

Associate
Joined
20 Sep 2014
Posts
120
Pretty much as title says.

When I connect the pump to the MB header it runs at 2500 rpm, which I think is fine. (First question, 2500 rpm adequate for x1 360mm, x1 240mm, gpu and cpu?)

Second is when I put it into headers 1,2,3 it spins at 4800 rpm.
However when I change it in the fan control settings to spin slower, it doesn't respond at all, I can turn the fan off and it'll keep spinning.

Any solution to #1#2?
 
Cerelia said:
Pretty much as title says.

When I connect the pump to the MB header it runs at 2500 rpm, which I think is fine. (First question, 2500 rpm adequate for x1 360mm, x1 240mm, gpu and cpu?)

Second is when I put it into headers 1,2,3 it spins at 4800 rpm.
However when I change it in the fan control settings to spin slower, it doesn't respond at all, I can turn the fan off and it'll keep spinning.

Any solution to #1#2?
Click to expand...

When I connect the pump to the MB header> l take it you mean CPU HEADER, if not connect it to the CPU HEADER.

See motherbroad manual.
 
Its an Asus x99 deluxe. Manual states all headers are pwm.
Besides that even the CPU header despite being sent to signal to 50% doesn't change the RPM at all. It runs at a static speed.
 
Cerelia said:
Its an Asus x99 deluxe. Manual states all headers are pwm.
Besides that even the CPU header despite being sent to signal to 50% doesn't change the RPM at all. It runs at a static speed.
Click to expand...

Have you set the fan headers to PWM control in the bios?

Not sure about the Asus x99 chipset boards but my Asus ROG Z97 uses AI suite, within which is Fan xpert3, this has a fan tuning option, my pumps and fans didn't have full PWM functionality until I'd run the tuning.
 
Most motherboard 4 pin headers are just voltage controlled not pwm controlled. The 4 pins are just there to look good.
 
smit101 said:
Have you set the fan headers to PWM control in the bios?

Not sure about the Asus x99 chipset boards but my Asus ROG Z97 uses AI suite, within which is Fan xpert3, this has a fan tuning option, my pumps and fans didn't have full PWM functionality until I'd run the tuning.
Click to expand...

And you win the internet.

Its weird, the way they word the fan tuning is that its going to run its auto-curve set program but in reality all it does it tests the fans on the headers to see their properties and enables the PWM control.

Pumps now able to be controlled and the other fans also.
Running at 1800rpm in my loop, moving fluid just fine, same temps are before except hardly any noise.

Edit: No settings in the BIOS (2102) to change the header.

Most motherboard 4 pin headers are just voltage controlled not pwm controlled. The 4 pins are just there to look good.
Click to expand...

While they do control voltage, they aren't just for show or to look good. Please don't spread false information. Simply saying they control voltage is an incorrect understanding of Pulse-width modulation.
 
Cerelia said:
While they do control voltage, they aren't just for show or to look good. Please don't spread false information. Simply saying they control voltage is an incorrect understanding of Pulse-width modulation.
Click to expand...

Huh? A pwm header should give you a constant 12v, if the header is feeding lower voltage in order to slow the fans then the 4th pin in fake and it's just a 3 pin header with a 4th pin to make it look good.

If you got it working, then obviously it's not the case in this example, but frequently motherboard manufacturers only have pwm control on the cpu header, and all the chassis fan headers are voltage controlled even if they have 4 pins
 
Last edited:
You must log in or register to reply here.
Back
Top Bottom