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Trouble with PWM control on chassis fan headers w/ PWM splitter? - Page 2

post #11 of 53
What happens if you just connect a fan straight to chassis fan header without pwm splitter, if speed changes that way but not with a splitter then that header is outputting voltage control.
Edited by mm67 - 1/27/13 at 11:57am
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post #12 of 53
Thread Starter 
yes, that's what is happening. The one fan I have on a header is not running at full speed - 620rpm according to FanXpert. I just wanted to verify the theory.
post #13 of 53
Then your chassis fan headers probably really are built same way as that sister model. You could just connect those top and rear fans to chassis fan headers and let them run on voltage control. If bios and FanExpert run them too fast then use Speedfan
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post #14 of 53
Then your chassis fan headers probably really are built same way as that sister model. You could just connect those top and rear fans to chassis fan headers and let them run on voltage control. If bios and FanExpert run them too fast then use Speedfan
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post #15 of 53
Thread Starter 
I'm actually pretty happy with the fan speed as it is, I'd probably settle for getting an extension and running both the 140s that way - they're slow and quiet vs the 120s that make a lot more noise when plugged into the chassis headers.
post #16 of 53
Thread Starter 
*sigh* should I have expected more?
Quote:
Dear Valued Customer,

Thank you for contacting ASUS Customer Service.

My name is Carter and it's my pleasure to help you with your problem.

Sorry,if directly connect one fan to the fan hearder 1,will the speed of this fan be controlled by the board correctly?
I am afraid to say that we have not tested such splitter on the
motherboard ,so we can't assure the compatibility.

If you continue to experience issues in the future, please do not hesitate
to contact us.
post #17 of 53
Quote:
Originally Posted by Gavush View Post

*sigh* should I have expected more?
YES!

But I don't know what you actually sent them in the first place either. wink.gif

Ask them simple questions. They are incapable of independent thought.

"I can control my pwm fan with the CPU_Fan header with Xpert (whatever you are using)..

But when I plug my pwm fan to the SYS_fan header I can not change the fan rpm."

That might still be too complicated for them to understand. biggrin.gif
Edited by doyll - 1/29/13 at 4:37am
post #18 of 53
Thread Starter 
I had basically copied and pasted what I had on my OP and cleaned it up a little to remove some of the clutter. I basically replied with "no, it does not work correctly. Yes, when I plug the fan into CHA FAN 1 header the speed changes, but it changes due to voltage instead of due to PWM. It changes due to PWM on my CPU FAN header but not the other fan headers"
post #19 of 53
Too many words

if that doesn't work you use bigger letters and simpler words. biggrin.gif

Everything is scripted for Carter.
You ask question, he searches that question in their data base and he reply with what pops up on his screen.
He cannot deviate or change the answer... because the great God Asus had Expert (ex =has-been spert = drip under pressure) assistants figure out what the best answers were to all the questions you might ask.

Of course these questions were all written in French, computer translated to Hebrew for the experts. Than the answeres were translated to Chinese, than Russian, and finally into English.

Oh! and if you search the fine print using a 2000x power micronoscope it says they are not legally liable for any damage their answers may do to you or your computer. biggrin.gif
post #20 of 53
Thread Starter 
here's how far I've gotten:
Quote:
Originally Posted by Gavush 
Hello Carter, when you connect the fan directly to the motherboard the speed is
controlled but not controlled by PWM. It's controlled by voltage. This header is
supposed to control using PWM or Voltage. If a PWM fan (4 pin) is attached it's
supposed control with PWM. If a regular fan is connected (3 wire) it's supposed to
control with voltage. This is the issue I am having wit hall three CHA FAN headers.
The CPU FAN header works ok.
Quote:
Originally Posted by Carter 
Dear Nick,

Sorry,may I ask how do you judge that the speed of fan is controlled by the voltage?
Also according to your previous description,it seems that the CHAN FAn IN pin on the Chassis fan connector hasn't been connected when you use the splitter.
Quote:
Originally Posted by Gavush 
Carter, sorry for the slow reply. I forget to bring home my volt meter to take a picture of the voltage. It is very easy to see the voltage is less - I can tell the voltage is less on the chassis fan because the LED is very dim on the fans plugged into Chassis fan header and bright on fans plugged into CPU header. PWM fans always have same LED brightness at any speed because the power is always 12v, the PWM signal changes the speed. On regular fan the LED is more bright when fan goes faster because there is more voltage. The Fan should have same bright as CPU fan - they are same but because the voltage is less it is not as bright. I attached a photo of the fan with chassis fan on "disable" and chassis fan on "silent" - you can see bright at 100% (disable) and dim at 60% (silent)
Quote:
Originally Posted by Carter 
Dear Nick,

I will pass the case to our relative department for a check.


apparently Carter is the gate keeper.
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