PWM Fan uncontrollable after installing another fan on 4-pin y-cable

Raskolnik

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May 31, 2014
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Hi all,

I have this heatsink and the fan to go with it,and i also bought another fan for it.I also have 2x fans for my case.
I also own this motherboard,with one 4pin "CPUFAN1" header and two 3pin "SYSFAN1" & "SYSFAN2" headers.
I recently bought a 4-pin(male) y-cable that gives 4 4-pin(female) outputs.

So here is what i get.Every single fan is PWM,and when connected to any 3pin header,it will work on 100% load,as expected.When any of them is connected on the 4pin "CPUFAN1" header,they will work as intended,having control and sensor readings.
But when i plug the y-cable onto motherboard's "CPUFAN1" header,things get a little bit tricky.Out of the 4 4-pins outputs,only the first has sensor reading,whis is also expected.
Anyways all fans work as intended,except coolmaster's one.That is,it will work normally when adapted to y-cable,but becomes uncontrollable as soon as a second or third fan comes into y-cable.The second or third fan,is still controllable,even though coolermaster's fan is not.I have installed coolermaster fan,on all the outputs of y-cable with no difference at all,except sensor reading at first output.

What is "wrong" with coolermaster's fan?

Thank you in advance.

P.S.I think rest of hardware components are kind of irrelevant but i will provide them asap if needed

 

Raskolnik

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May 31, 2014
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If i do so,the 120mm fans will work at full load,something like 1400 rpm which is unacceptable for me.That is not a solution.I need to be able to control coolermaster and the 2 case fans(120mm)

 
Hi Raskolnik
+1 i agree with i7baby , just your cpu fans to the pwm header

you can still connect 4pin fans to your motherboard you will just not have the option to control them within the bios
because the blue wire is for control
Connector_mbfanpwm_4to3pin.png

the blue wire
951417f1_vbattach185050.jpeg

but they will still work fine
 

Raskolnik

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May 31, 2014
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When connected at 3 pin,coolermaster is at ~2400 rpm,Arctic cooling F9 at ~1850,and F12's are at ~1400.

F9 at 1850 rpm,makes noise good enough for me and is not to be messed.But coolermaster's rpm=x of 2400 must get to 1850<x<2200 and F12's to <1200
 

Raskolnik

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May 31, 2014
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That is a solution that i had in mind,but i need to buy extra.I just bought the y-cable for that reason.Why won't coolermaster 's fan be controllable?

 

Raskolnik

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May 31, 2014
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That pretty much sums all the solutions up for me.
Thank you,but i need still to buy things.
I just want to know why it becomes uncontrollable after installing another fan,so i can maybe fix it myself
 

Raskolnik

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May 31, 2014
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That's more like it.
Still,i dont get it why 3 arctic cooling fans will work onto y-cable full controllable,and coolermaster will only be controllable when installed alone and only
 

Raskolnik

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May 31, 2014
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I haven't really read all there is about Pulse Width Modulation,but is there a possibility that fans are incompatible,as to PWM?
I mean will 2 or 3 coolermasters work on the y-cable?
 

Raskolnik

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May 31, 2014
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I just bought a y-cable.Why of all fans,coolermaster won't be controllable?
 

Raskolnik

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May 31, 2014
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I have y-cable permantly installed.I install coolermaster,it works(controllable).I install another fan,coolermaster dies(uncontrollable).No matter how many fans,all work except coolermaster.

What happens if i connect 2 coolermasters?
 

Raskolnik

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May 31, 2014
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So there are incidents of such incompatibility?If you are 100% positive and this is somewhat common then i can end searching

 

Raskolnik

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May 31, 2014
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But i can install 3 Arctic Cooling fans and i can control all of them via speedfan pwm1.