Using fan header splitters?

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cameron.tran0107

Jul 21, 2018
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I’m going to build a PC soon, and I wanted to use 6 Corsair SP120 fans. (4 case fans, 2 on radiator). My motherboard has only 2 case fan headers, and since I’m using a liquid cooler my CPU Fan header is open. That leaves me with 3 fan headers I can use. If I use 3 fan header splitters I can now have 6 inputs for my fans. I have two questions about using fan header splitters though.

1. Will both fans be detected, and can I adjust RPM’s of each of them?
(This I can deal with not being able to do, but I still would like to know if I can)

2. Will there be sufficient power to each of the 2 fans plugged into 1 header?

(https://m.newegg.com/products/N82E16812162026 Example of such fan splitters)

Also, does anyone have any recommendations for fan header splitters? Thanks.
 
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Lutfij

Lutfij

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Oct 7, 2009
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If the fans are all PWM versions, then you can grab a PWM splitter like the one made by Swiftech or Akasa and have it connected off the CPU_Fan header on the board and the other fans on the splitter. That way you have all your fans regulated by the CPU's temps.

The way the splitter works, the board/system will only see one fan connected to the board which will feed telemetry data to and from the board. Might I ask what AIO cooler you're referring to? I know that pretty much all of Asetek's coolers rely on a single connection from the board, CPU_FAN, to operate the fans and the pump. The fans in turn are connected to the pump/block.

Better yet, please parse your full system's specs like so:
CPU:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
 
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cameron.tran0107

Jul 21, 2018
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0
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So, if I read that right, I could use one splitter to connect all the fans to the CPU_FAN header and have their speed controlled by the temps of the CPU. This makes sense though my motherboard, an ASRock Z370 Extreme 4, only supports 1A (12W) of power, to the CPU_FAN. The Corsair SP120 PWM fans I’m going to use each have a power draw of 0.18A, while operating at 12v. Since I want to use 6 of the case fans, the power draw if the fans is greater than the supported supply on the CPU_FAN header. I assume that this only prevents the fans from operating at full speed. Or will something go wrong?

Also where could I find such a splitter that connects 1 to 6? A link or name?

Specs:
CPU: i7-8700k
AIO: Corsair H100i GTX*
Motherboard: ASRock Z370 Extreme4
Ram: 16gb (8x2) G.Skill Trident Z RGB 2666 MHz
SSD: Adata SU650 480gb 2.5”
HDD: Seagare Barracuda 1tb 3.5” 7200RPM
GPU: Gigabyte GeForce GTX 1080 Windforce OC
PSU: Evga SuperNOVA G3 750w
Chassis: Corsair Carbide 275r

*Not using included fans
 
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