Splitter questions regarding PWM and power.

[Watashi]

So to my understanding this splitter's molex connector provides power to the wires and ultimately to the fans. And The 4 Pin female connector is for the motherboard so it can send/receive PWM signals. Is this accurate? Also I always thought until now that PWM was just another way to deliver power. Please my sweet enthusiast brethren, provide me with some clarity!
https://www.newegg.com/Product/Product.aspx?Item=N82E16812311001&ignorebbr=1&nm_mc=KNC-GoogleAdwords-PC&cm_mmc=KNC-GoogleAdwords-PC-_-pla-_-Cables+-+Internal+Power+Cables-_-N82E16812311001&gclid=Cj0KEQjwxPbHBRCdxJLF3qen3dYBEiQAMRyxS_40jMOPdEXjo_xvCVm7ZYo6nDC4-sDDPZFqEV6igwoaAqiK8P8HAQ&gclsrc=aw.ds

[W-L]

4 minutes ago, Doomerson said:

So to my understanding this splitter's molex connector provides power to the wires and ultimately to the fans. And The 4 Pin female connector is for the motherboard so it can send/receive PWM signals. Is this accurate? Also I always thought until now that PWM was just another way to deliver power. Please my sweet enthusiast brethren, provide me with some clarity!
https://www.newegg.com/Product/Product.aspx?Item=N82E16812311001&ignorebbr=1&nm_mc=KNC-GoogleAdwords-PC&cm_mmc=KNC-GoogleAdwords-PC-_-pla-_-Cables+-+Internal+Power+Cables-_-N82E16812311001&gclid=Cj0KEQjwxPbHBRCdxJLF3qen3dYBEiQAMRyxS_40jMOPdEXjo_xvCVm7ZYo6nDC4-sDDPZFqEV6igwoaAqiK8P8HAQ&gclsrc=aw.ds

Yes that splitter take power from the PSU and only has a PWM and RPM signal from the motherboard itself so it doesn't draw any power from it. This makes it however only good for 4 Pin PWM control as 3 pin DC voltage control fans on that splitter will only run full speed.

[Technous285]

PWM controls the speed of the fans, it's not power delivery.

Pin 1 = Power

Pin 2 = Ground

Pin 3 = Tachometer line (RPM measuring)

Pin 4 = PWM signal line

 

That cable you linked takes the RPM readings from one fan and feeds it back to the motherboard (which ever plug has the full 4 pins), whilst splitting the PWM signal from the motherboard out to control all fans at the same time for the same speed.

[Watashi]

17 hours ago, Technous285 said:

PWM controls the speed of the fans, it's not power delivery.

Pin 1 = Power

Pin 2 = Ground

Pin 3 = Tachometer line (RPM measuring)

Pin 4 = PWM signal line

 

That cable you linked takes the RPM readings from one fan and feeds it back to the motherboard (which ever plug has the full 4 pins), whilst splitting the PWM signal from the motherboard out to control all fans at the same time for the same speed.

Thanks man, is there a specific software to control Noctua fans RPMs that you know of by chance?

[W-L]

1 hour ago, Doomerson said:

Thanks man, is there a specific software to control Noctua fans RPMs that you know of by chance?

If they are the 4 pin PWM version you just need something capable of PWM control. Your motherboard should be able to do this with the BIOS or using their own software. 

[Technous285]

3 hours ago, Doomerson said:

Thanks man, is there a specific software to control Noctua fans RPMs that you know of by chance?

I personally use SpeedFan to control the PWM fans (EK-Vardar F4 120's for GPU's & the stock CoolerMaster 120's on my Nepton 120XL for my CPU) in my system. Sure, it might not "look pretty" in "modern" OS UI's (see Metro & Win10), but it works fairly damn well.

[WoodenMarker]

17 hours ago, Technous285 said:

PWM controls the speed of the fans, it's not power delivery.

It's power delivery in the context of pwm fans. A pwm signal controls the speed of a fan by determining how power is delivered.