Is there any problem in using the Y-splitter of the Noctua NF-F12?

[Girish Iyer]

I have a Corsair SPEC-01 case with one built-in 120 mm fan and my motherboard (Asus H97M-E) has 2 chassis fans besides the CPU fan header. For the front intakes, I am planning to buy 2 Noctua NF-F12s (120mm) and due to the limitation, I would have to use the Y-splitter which comes with the F12s to connect both the fans to the remaining chassis fan header. (Note: I would prefer not to connect the fans to the PSU via a molex)

My queries are these-
1. Would connecting 2 fans through a splitter cause any problems to the motherboard?
2. I don't know the voltage requirements of the fans and the supply capacity of the 4 pin PWM header of the motherboard, so if anybody has any understanding of that, please tell me if the power supplied by the mobo be enough for the 2 fans.
3. I have seen in some forums where people have said that the fans being PWM, you don't want to use a Y splitter as it wouldn't be the optimum way to utilize a PWM fan. Also, it might cause some ticking problems etc. in the fans due to the digital signal utilized by them. Are these concerns legitimate?

If you have any other suggestions regarding the installation of the fans, I would like to hear them too.

Thanks in advance for any assistance!

 

[Outlander_04]

1 No
2 12v
3 don't buy pwm fans for a case

 

[Girish Iyer]

1 No
2 12v
3 don't buy pwm fans for a case

Could you please elaborate your answer to the third question? Should I not buy PWM because it isn't necessary or because it could cause some problems?

 

[Outlander_04]

Not necessary .

Most modern BIOS will let you alter fan speed even on 3 pin headers

 

[Girish Iyer]

I prefer the Noctuas over the others due to their quiet working and great performance. It's just a coincidence that they have a PWM type connection. So connecting two in a single header via splitter would be fine right?

 

[Outlander_04]

Yes.
If you don't want PWM just plug them in to a 3 pin header on the mb

 

[Bearmann]

http://noctua.at/en/products/fan.html

http://noctua.at/en/which_fan_is_right_for_me

Your MB headers are 4 pin and support 1 amp. The NF-F12 is only 0.05 amps. (p 1-3, 1-13) Something doesn't seem right, though. In general, I don't think you are supposed to put more than two fans on one header. It seems like I am off by a decimal point.

http://dlcdnet.asus.com/pub/ASUS/mb/LGA1150/H97M-E/E9092_H97M-E.pdf

I think I have seen discussion in the past, however, that the 4 pin headers on the previous generation Asus boards (before Z170) are fakes, i.e. not true PWM. You can still use a PWM fan in them, however. My understanding is that with a true PWM header and fan on a Y connector, the RPM sensing is only obtained from one fan, but both fans are controlled by that data. Therefore it is important to use the same model fan on each connector, otherwise one could spin much faster than the other, or not spin at all.

 

[Girish Iyer]

http://noctua.at/en/products/fan.html

http://noctua.at/en/which_fan_is_right_for_me

Your MB headers are 4 pin and support 1 amp. The NF-F12 is only 0.05 amps. (p 1-3, 1-13) Something doesn't seem right, though. In general, I don't think you are supposed to put more than two fans on one header. It seems like I am off by a decimal point.

http://dlcdnet.asus.com/pub/ASUS/mb/LGA1150/H97M-E/E9092_H97M-E.pdf

I think I have seen discussion in the past, however, that the 4 pin headers on the previous generation Asus boards (before Z170) are fakes, i.e. not true PWM. You can still use a PWM fan in them, however. My understanding is that with a true PWM header and fan on a Y connector, the RPM sensing is only obtained from one fan, but both fans are controlled by that data. Therefore it is important to use the same model fan on each connector, otherwise one could spin much faster than the other, or not spin at all.

Thanks, Bearmann. I appreciate your detailed response.

 

[Bearmann]

You're very welcome. Hopefully, someone with greater knowledge than me can elaborate on this.