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Will there be any problem with this fan setup?

post #1 of 10
Thread Starter 
Hi everyone,

The following are what I plan to have:
2 Fractal Design Dynamic GP-14 140mm Fans
1 Fractal Design Dynamic GP-12 120mm Fans.
http://www.fractal-design.com/home/product/casefans/dynamic-series/dynamic-gp-14

MSI B150I Gaming Pro AC Motherboard
https://www.msi.com/Motherboard/B150I-GAMING-PRO-AC.html#hero-specification

Silverstone CPF02 3 Way PWM Fan Splitters
http://www.silverstonetek.com/product.php?pid=485

What I plan to do is to connect 2 140mm & 1 120mm 3-pins fans to the 3 way PWM fan splitter and onto the motherboard system fan header.

Will there be any problem if I use PWM fan splitter for the 3-pins fans and using different sized fans(1x120mm/2x140mm) into 1 system fan header?
Should I connect the 140mm or 120mm 3-pin fans to the 4 pins on the fan splitter(i.e.1 side has 4 pin, rest 3pin)?

Thanks
post #2 of 10
You might be misunderstanding what exactly 3-pin fans and 4-pin PWM fans are, and what the three and four pins on the PWM splitter do. Those connectors where you only get three pins on the PWM splitter does not mean that you are supposed to connect a 3-pin fan there. It's still designed to work for a 4-pin fan. The missing pin is not the fourth pin (which has the PWM signal), the missing pin is the third one (which reports back the speed of a fan to the motherboard).

This is all probably not a problem, but perhaps try to think through what's happening. You might have some expectations that won't work out. What you are building here will basically be something using normal 3-pin fans instead of PWM fans. This setup is not a PWM setup. The fans have to be controlled through voltage. You can buy a splitter for 3-pin fans if you want to (which will have one 3-pin connector and several 2-pin ones). You don't really need the PWM splitter.

What you have to think about is the fan header of the motherboard. It has a 4-pin connector, right? Does it control the fans through the PWM signal on the fourth pin, or does it control fans through the voltage on the second pin? If it uses a constant 12V on the second pin and tries to control through PWM on the fourth pin, then the PWM splitter will do nothing and your fans will always run at full speed and won't be controlled at all. You need to look this up somehow. It might be explained in the manual that you can probably download on its website.
post #3 of 10
Thread Starter 
Quote:
Originally Posted by deepor View Post

You might be misunderstanding what exactly 3-pin fans and 4-pin PWM fans are, and what the three and four pins on the PWM splitter do. Those connectors where you only get three pins on the PWM splitter does not mean that you are supposed to connect a 3-pin fan there. It's still designed to work for a 4-pin fan. The missing pin is not the fourth pin (which has the PWM signal), the missing pin is the third one (which reports back the speed of a fan to the motherboard).

This is all probably not a problem, but perhaps try to think through what's happening. You might have some expectations that won't work out. What you are building here will basically be something using normal 3-pin fans instead of PWM fans. This setup is not a PWM setup. The fans have to be controlled through voltage. You can buy a splitter for 3-pin fans if you want to (which will have one 3-pin connector and several 2-pin ones). You don't really need the PWM splitter.

What you have to think about is the fan header of the motherboard. It has a 4-pin connector, right? Does it control the fans through the PWM signal on the fourth pin, or does it control fans through the voltage on the second pin? If it uses a constant 12V on the second pin and tries to control through PWM on the fourth pin, then the PWM splitter will do nothing and your fans will always run at full speed and won't be controlled at all. You need to look this up somehow. It might be explained in the manual that you can probably download on its website.


Thanks for the reply. I intend to get the Silverstone 3 Way PWM 4-Pin fans splitter over the 3 Way 3-Pin fans splitter cause it's widely available and similar in price unless it doesn't work with 3-Pin fans?

I understand if I were to connect 3-Pin fans to PSU, they will run at 100% speed. However, I thought if I connect them to the MSI MOBO, they can be controllable via BIOS voltage fan speed settings or automatic control via temperature? Here's the MSI B150I Sysfan manual http://imgur.com/8lRkwwn.
Edited by Harahyuna - 6/20/16 at 10:52pm
post #4 of 10
Quote:
Originally Posted by Harahyuna View Post

Thanks for the reply. I intend to get the Silverstone 3 Way PWM 4-Pin fans splitter over the 3 Way 3-Pin fans splitter cause it's widely available and similar in price unless it doesn't work with 3-Pin fans?

I understand if I were to connect 3-Pin fans to PSU, they will run at 100% speed. However, I thought if I connect them to the MSI MOBO, they can be controllable via BIOS voltage fan speed settings or automatic control via temperature? Here's the MSI B150I Sysfan manual http://imgur.com/8lRkwwn.

If you connect the 3pin fans to the PWM splitter, they will run at full speed, as PWM supplies a constant 12V. A 4pin PWM fan is required to modulate the 12V according to the PWM signal.

Best option is to connect the 3pin fans to the motherboard headers and use its voltage control options.
post #5 of 10
Thread Starter 
Quote:
Originally Posted by MicroCat View Post

If you connect the 3pin fans to the PWM splitter, they will run at full speed, as PWM supplies a constant 12V. A 4pin PWM fan is required to modulate the 12V according to the PWM signal.

Best option is to connect the 3pin fans to the motherboard headers and use its voltage control options.

So your saying with a PWM fan splitter, I won't be able to use voltage control options compared to using a 3-Pin fan splitter? Why is that the case since i'm only connecting 3-Pin fans? Both methods will still connect to the motherboard sysfan header.
post #6 of 10
Quote:
Originally Posted by Harahyuna View Post

So your saying with a PWM fan splitter, I won't be able to use voltage control options compared to using a 3-Pin fan splitter? Why is that the case since i'm only connecting 3-Pin fans? Both methods will still connect to the motherboard sysfan header.

Sorry, assumed the PWM splitter would be connected to a PWM header. If connected to a 3pin header, it will work with 3pin fans.
post #7 of 10
What the black cat said. thumb.gif
post #8 of 10
Thread Starter 
Just to confirm, two 140mm & one 120mm 3-Pin fans connected to a 3 Way PWM 4-Pin fan splitter onto 1 system fan header, temperatures can be controlled through voltage and automatic by temperatures sensor through the BIOS?

http://imgur.com/8lRkwwn Manual shows only the CPUFAN is using PWM so it doesn't matter whether I'm using 3-Pin or 4-Pin as it uses Voltage for SYSFAN but I don't understand what does NC means in the 4th pin.

Is connecting 3 fans to 1 header generally safe? 0.2A for each fans and the msi mobo support 1A, 12v. http://www.fractal-design.com/home/product/casefans/dynamic-series/dynamic-gp-14
post #9 of 10
Quote:
Originally Posted by Harahyuna View Post

Just to confirm, two 140mm & one 120mm 3-Pin fans connected to a 3 Way PWM 4-Pin fan splitter onto 1 system fan header, temperatures can be controlled through voltage and automatic by temperatures sensor through the BIOS?

http://imgur.com/8lRkwwn Manual shows only the CPUFAN is using PWM so it doesn't matter whether I'm using 3-Pin or 4-Pin as it uses Voltage for SYSFAN but I don't understand what does NC means in the 4th pin.

Is connecting 3 fans to 1 header generally safe? 0.2A for each fans and the msi mobo support 1A, 12v. http://www.fractal-design.com/home/product/casefans/dynamic-series/dynamic-gp-14

Yes, should be ok. Are all the fans from the Fractal GP series? If so, should under the 1A rating combined, even at start up.

In that image, the SYSFAN pin 4 probably means Not Connected. Or No Choice. Or No Cats. If the last one, would be bad and I would return the board immediately. biggrin.gif
post #10 of 10
Why not get a PWM splitter and PWM fans.
That way you will have a much better control over your fans.

Look at the Swiftech 8-Way PWM Splitter and go for the Venturi Series PWM.
Edited by Sp33d Junki3 - 6/21/16 at 11:59pm
    
CPUMotherboardGraphicsRAM
Intel 3770k @ 4.2Ghz Asus Z77 Sabertooth EVGA GTX1060 3GB Crucial Ballistix Tactical 16GB BLT2K8G3D1608ET... 
Hard DriveHard DriveHard DriveHard Drive
Crucial MX100 512GB Corsair Force 115GB WD Green 1TB WD Green 2TB 
CoolingOSMonitorKeyboard
Cryorig C1 + XT140 Win7 64 Home SP1 ASUS VE278Q CM Storm Trigger Brown Switch 
PowerCaseMouseMouse Pad
Corsair AX650 NZXT S340 Logitech G500 Razer Goliathus Extended Mouse Pad - Speed 
AudioAudioAudioAudio
Audiotrak Prodigy Cube DAC Edifier S330D 2.1 Speaker Bose AE2 Headphone Superlux 668B Headphone 
AudioAudioOtherOther
Logitech UE 4000 Headphone Sennheiser PC320 Headset MX-4 Thermal Paste (CPU/GPU) 3x 140mm Noctua NF-P14s Redux 1200rpm PWM 
OtherOther
1x 120mm Noctua NF-S12B Redux 1200rpm PWM NZXT 2m Sleeved White LED 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Intel 3770k @ 4.2Ghz Asus Z77 Sabertooth EVGA GTX1060 3GB Crucial Ballistix Tactical 16GB BLT2K8G3D1608ET... 
Hard DriveHard DriveHard DriveHard Drive
Crucial MX100 512GB Corsair Force 115GB WD Green 1TB WD Green 2TB 
CoolingOSMonitorKeyboard
Cryorig C1 + XT140 Win7 64 Home SP1 ASUS VE278Q CM Storm Trigger Brown Switch 
PowerCaseMouseMouse Pad
Corsair AX650 NZXT S340 Logitech G500 Razer Goliathus Extended Mouse Pad - Speed 
AudioAudioAudioAudio
Audiotrak Prodigy Cube DAC Edifier S330D 2.1 Speaker Bose AE2 Headphone Superlux 668B Headphone 
AudioAudioOtherOther
Logitech UE 4000 Headphone Sennheiser PC320 Headset MX-4 Thermal Paste (CPU/GPU) 3x 140mm Noctua NF-P14s Redux 1200rpm PWM 
OtherOther
1x 120mm Noctua NF-S12B Redux 1200rpm PWM NZXT 2m Sleeved White LED 
  hide details  
Reply
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