Need help with Noctua NA-SYC1 4-pin splitter

[yorsh12]

Hi guys,

I've got a MSI b250m pro-vh motherboard, that has one CPU 4-pin header and a SYS fan 4-pin header. I'm planning on getting a splitter that worked with the last one, and being able to control two 4-pin PWM fans.

Is it possible to control the speed of both fans with the splitter? Or will I get one fan with 100% speed all the time, and being able to just control the other one?

Thanks for your help!

 

[Aeacus]

If you use Y-splitter, both fans on the Y-splitter will run at the same speed. E.g at 1100 RPM or if you change one to 1300 RPM, 2nd fan will automatically change to 1300 RPM as well (provided that both fans are same). For individual control over each fan, you'll need a fan controller.

 

[jay32267]

One of the four wires is the digital control for the fan speed.
If you split it, that signal will go to both fans and control both fans the same.

 

[yorsh12]

Thanks for the replies!

I've read that the Noctua NA-SYC1 has one 3-pin output, and another 4-pin output, and that's the reason why it will let you control only one of your fans. Is it wrong, and is it the right splitter that I need for my porpuse?

If you use another one that can recommend me, I'll be thankful.

 

[jay32267]

It appears that it is wrong because here>>>
https://noctua.at/en/na-syc1

It says "

NA-SYC1
SPECIFICATIONS
SERVICE

The NA-SYC1 is a fan accessory set consisting of two fully sleeved NA-YC1 Y-Cables for 4-pin PWM fans. The NA-YC1 Y-Cables make it possible to run two 4-pin PWM fans on a single fan header and to let the mainboard control the speed of both fans simultaneously.

 

[Aeacus]

In the Noctua Y-splitter, the missing pin is 3rd pin and not 4th pin, making the control of PWM fans still possible.

The fan pinout is as follows:
pin #1 - +12V
pin #2 - ground
pin #3 - sense (RPM feed back to the MoBo)
pin #4 - PWM (PWM control for 4-pin fans)

There's no need for a 3rd pin in Y-splitter for 2nd fan since MoBo can read the RPM for only 1x fan, hence why it's missing.