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Fan Control Issue...

post #1 of 7
Thread Starter 
I have a 360 rad with 3 120mm fans I am trying to control via CPU Temp. This is the 4pin PWM header coming right off the motherboard. Its works fine if there is one 3pin non-PWM or 4pin PWM fan hooked up. But, If I split it among 3 fans, it cannot control the speed of these fans. What gives? It's just voltage regulation...

Motherboard:
Asus P8Z68-V
    
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post #2 of 7
What fans are you using, 3 pin, 4 pin PWM? What type of cable adapter are you using to connect up the fans? Looking at BIOS option, PWM control only for CPU Fan/CPU Fan OPT (according to the manual)
post #3 of 7
If you have a proper PWM 4-pin splitter cable cable, the PWM signal should be able to control three PWM 4-pin fans, but if your board is running in PWM mode trying to power regular 3-pin fans, they will be on all the time.

Your PWM header on the motherboard might or might not support running in PWM or DC (voltage control) mode. In PWM mode, the fan always has 12 V and the 4th wire is a pulse signal that turns the 12 V on and off to the fan at different intervals. Since a 3-pin fan relies on just the voltage, it would always be at 100%.

On the other hand, if you are running three PWM fans using only a 3-wire splitter, you lose that PWM signal cable and the PWM fans will default to 100%.



What splitter and what fans are you using?
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post #4 of 7
Thread Starter 
I'm using 3pin fans with 3pin extensions and a 3pin 3 way paralleled splitter. The motherboard seems to only support PWM with seems to be BS for the money I paid for it. Thanks for the information. I hink I'm going to have to get one of those fan controllers that converts PWM to DC Voltage control.
    
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post #5 of 7
Quote:
Originally Posted by FireBean View Post

I'm using 3pin fans with 3pin extensions and a 3pin 3 way paralleled splitter. The motherboard seems to only support PWM with seems to be BS for the money I paid for it. Thanks for the information. I hink I'm going to have to get one of those fan controllers that converts PWM to DC Voltage control.

I'm in the same boat, my ASRock Fatal1ty only supports PWM mode on the PWM headers, but my old Asus M4A89GTD Pro/USB3 supported running DC mode on a PWM header.

You don't have a 3-pin header on your board that you can use? You don't need to have a fan on the CPU header. If your motherboard won't POST without a fan connected, you can go in to the BIOS to the hardware monitor and set the CPU_Fan RPM to IGNORED.
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CaseMouseMouse PadAudio
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CHILZ - Lan Rig
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CANARY - Main Rig
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CADILLAC - HTPC
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CPUMotherboardGraphicsRAM
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Hard DriveHard DriveHard DriveCooling
250 GB Samsung 840 240 GB Kingston 3 TB USB 3.0 Drive Custom Loop 
OSMonitorKeyboardPower
Windows 10 Preview BenQ GL2450 Filco MajesTouch2 Ninja PC P&C Silencer Mk III 600 W 
CaseMouseMouse PadAudio
Fractal Design Core 1000 Mionix Castor Monoprice XXL JL Amps + Custom Morel Bookshelf speakers 
Other
Scythe Kama-Panel 3 
CPUMotherboardGraphicsRAM
FX-8150 @ 4.6 GHz Fatal1ty 990FX Pro 9800 GTX+ 512 MB G.Skill Ripjaws X 1866 CL9 
Hard DriveHard DriveCoolingOS
120 GB OCZ Vertex 3 1 TB WD Black 5x 120mm + MCP350 + EK Supreme HF + MicroRes Windows 8 Consumer Preview 
MonitorKeyboardPowerCase
2x Dell U2212HM Logitech G110 Cooler Master 850W Silent Pro Cooler Master 690 II Adv. 
MouseMouse PadAudio
Razer Death Adder 3.5G Staples Gel Cushion Asus Xonar DG + Senn. PC333D 
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post #6 of 7
Thread Starter 
The other two chassis headers are taken up by the chassis fans and I don't have a two way splitter right now frown.gif
    
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post #7 of 7
Quote:
Originally Posted by FireBean View Post

I'm using 3pin fans with 3pin extensions and a 3pin 3 way paralleled splitter. The motherboard seems to only support PWM with seems to be BS for the money I paid for it. Thanks for the information. I hink I'm going to have to get one of those fan controllers that converts PWM to DC Voltage control.


This is why I call my mb an As.s mb. You can dig around and get Voltage control in mine, but the variance is something like 60-90%. Fugly, IMO.

 

Best to get an Akasa FP-5 and PWM fans. I'm using an Akasa AK-CB002 to control three PWM fans - cpu heatsink push/pull and the top intake fan (a TY-140) to feed them.

 

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