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Using Fan Splitter cable - How does fan controller report the RPM for two different fans?

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Go to solution Solved by Aniallation,

Ah ok. So to clarify if I have two identical Noctua 3000RPM fans connected via fan splitter in the same channel and set the RPM from the NZXT controller to only 1300RPM, both fans will be 1300RPM? None of the fan is receiving less power because of the splitter? (Is there any disadvantages performance-wise using a splitter?)

 

Also what about radiator fans, some people always said only use it on motherboard CPU fan headers not to the fan controller, why is that?

If the fans are identical, then they will be at the same RPM at the same power levels.

 

CPU cooler fans should be used on motherboard CPU fan headers so that they are automatically adjusted by the motherboard depending on CPU load. So when your CPU gets hotter the fans automatically spin faster.

Posted

Hello.

 

I looked at the new NZXT Sentry 3 fan controller. There are 5 fan channels and can support up to 15W per channel therefore it says you can use a fan splitter to have 2 or more fans on the same channel. (eg. Noctua 3000RPM fans are ~7W so you can have two of them in the same channel)

 

This fan controller also reports the RPM of the fans, but what if you have two different fans with different RPM? How would it report the RPM? Average? Minimum?

 

Also would you recommend plugging radiator fans into fan controllers? Because I hate needing to set a fan curve or using the BIOS, I want to adjust the RPM on the fly by using the fan controller which is mounted on a 5.25" bay.

 

Thanks!

 

EDIT: Not just fan controller but BIOS too, how would they report the RPM from fan splitters?

CPU AMD FX-8350 @ 4.0GHz | Cooling AMD Stock | Motherboard AsRock 970 Extreme4 | RAM 8GB (2x4) DDR3 1333MHz | GPU AMD Sapphire R9 290 Vapor-X | Case Fractal Define R5 Titanium | 


Storage Samsung 120GB 840 EVO | PSUThermaltake Litepower 600W | OS Windows 8.1 Pro 64-bit


Upgrading to - Intel i7 - New motherboard - Corsair AIO H110i GT watercooler -  1000W PSU


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I looked at the new NZXT Sentry 3 fan controller. There are 5 fan channels and can support up to 15W per channel therefore it says you can use a fan splitter to have 2 or more fans on the same channel. (eg. Noctua 3000RPM fans are ~7W so you can have two of them in the same channel)

 

This fan controller also reports the RPM of the fans, but what if you have two different fans with different RPM? How would it report the RPM? Average? Minimum?

 

Also would you recommend plugging radiator fans into fan controllers? Because I hate needing to set a fan curve or using the BIOS, I want to adjust the RPM on the fly by using the fan controller which is mounted on a 5.25" bay.

Most splitters report the RPM of one of the fans connected. The other just gets identical power and/or PWM signals to the other but RPM is irrelevant to that one.  If you use two different fans then RPM will be measured by whichever fan is connected to the output with the tach wire connected.

"Rawr XD"

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It takes the RPM of one fan and displays that, it doesn't use multiple signals, the connector doesn't work that way.

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Most splitters report the RPM of one of the fans connected. The other just gets identical power and/or PWM signals to the other but RPM is irrelevant to that one.  If you use two different fans then RPM will be measured by whichever fan is connected to the output with the tach wire connected.

 

It takes the RPM of one fan and displays that, it doesn't use multiple signals, the connector doesn't work that way.

 

Ah ok. So to clarify if I have two identical Noctua 3000RPM fans connected via fan splitter in the same channel and set the RPM from the NZXT controller to only 1300RPM, both fans will be 1300RPM? None of the fan is receiving less power because of the splitter? (Is there any disadvantages performance-wise using a splitter?)

 

Also what about radiator fans, some people always said only use it on motherboard CPU fan headers not to the fan controller, why is that?

CPU AMD FX-8350 @ 4.0GHz | Cooling AMD Stock | Motherboard AsRock 970 Extreme4 | RAM 8GB (2x4) DDR3 1333MHz | GPU AMD Sapphire R9 290 Vapor-X | Case Fractal Define R5 Titanium | 


Storage Samsung 120GB 840 EVO | PSUThermaltake Litepower 600W | OS Windows 8.1 Pro 64-bit


Upgrading to - Intel i7 - New motherboard - Corsair AIO H110i GT watercooler -  1000W PSU


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Ah ok. So to clarify if I have two identical Noctua 3000RPM fans connected via fan splitter in the same channel and set the RPM from the NZXT controller to only 1300RPM, both fans will be 1300RPM? None of the fan is receiving less power because of the splitter? (Is there any disadvantages performance-wise using a splitter?)

 

Also what about radiator fans, some people always said only use it on motherboard CPU fan headers not to the fan controller, why is that?

If the fans are identical, then they will be at the same RPM at the same power levels.

 

CPU cooler fans should be used on motherboard CPU fan headers so that they are automatically adjusted by the motherboard depending on CPU load. So when your CPU gets hotter the fans automatically spin faster.

"Rawr XD"

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Thank you.

CPU AMD FX-8350 @ 4.0GHz | Cooling AMD Stock | Motherboard AsRock 970 Extreme4 | RAM 8GB (2x4) DDR3 1333MHz | GPU AMD Sapphire R9 290 Vapor-X | Case Fractal Define R5 Titanium | 


Storage Samsung 120GB 840 EVO | PSUThermaltake Litepower 600W | OS Windows 8.1 Pro 64-bit


Upgrading to - Intel i7 - New motherboard - Corsair AIO H110i GT watercooler -  1000W PSU


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Posted

Hello.

 

I looked at the new NZXT Sentry 3 fan controller. There are 5 fan channels and can support up to 15W per channel therefore it says you can use a fan splitter to have 2 or more fans on the same channel. (eg. Noctua 3000RPM fans are ~7W so you can have two of them in the same channel)

 

This fan controller also reports the RPM of the fans, but what if you have two different fans with different RPM? How would it report the RPM? Average? Minimum?

 

Also would you recommend plugging radiator fans into fan controllers? Because I hate needing to set a fan curve or using the BIOS, I want to adjust the RPM on the fly by using the fan controller which is mounted on a 5.25" bay.

 

Thanks!

 

EDIT: Not just fan controller but BIOS too, how would they report the RPM from fan splitters?

I wish I could do that with my new build, but as I am getting the otherwise awesome H440 case my only choice is a Software based option like the Grid+ ;(

PCP Link: https://pcpartpicker.com/user/Niyu/saved/#view=W7rPxr

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I wish I could do that with my new build, but as I am getting the otherwise awesome H440 case my only choice is a Software based option like the Grid+ ;(

Why not the Fractal Define R5? Both cases have the same price.

CPU AMD FX-8350 @ 4.0GHz | Cooling AMD Stock | Motherboard AsRock 970 Extreme4 | RAM 8GB (2x4) DDR3 1333MHz | GPU AMD Sapphire R9 290 Vapor-X | Case Fractal Define R5 Titanium | 


Storage Samsung 120GB 840 EVO | PSUThermaltake Litepower 600W | OS Windows 8.1 Pro 64-bit


Upgrading to - Intel i7 - New motherboard - Corsair AIO H110i GT watercooler -  1000W PSU


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Not Blue D:

The LED is blue....atleast hehe

 

Also I meant to say 'same price' not 'place'.

CPU AMD FX-8350 @ 4.0GHz | Cooling AMD Stock | Motherboard AsRock 970 Extreme4 | RAM 8GB (2x4) DDR3 1333MHz | GPU AMD Sapphire R9 290 Vapor-X | Case Fractal Define R5 Titanium | 


Storage Samsung 120GB 840 EVO | PSUThermaltake Litepower 600W | OS Windows 8.1 Pro 64-bit


Upgrading to - Intel i7 - New motherboard - Corsair AIO H110i GT watercooler -  1000W PSU


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