Why does one split have a pin missing? With the missing pin, can it still power a 3 pin fan?

The missing pin is what the motherboard uses to read the fan's speed. As it can only read one, only one header has that pin. The 4th pin is PWM. The remaining two are power and ground, which is what a 3 (or 4) pin fan runs on, so yes, it will power a 3 pin fan.

I’m sorry i wanted to know the fan splitter one has 4 pins and the other 3? Is that normal or it’s missing the pins?

That's how it's supposed to be. The 4-pin header includes a "TAC" (tachometer) signal that goes from the fan to the motherboard so it can report the fan RPM. The motherboard can only read one fan or the other, so plug the fan you want to read into the header with 4 pins. The fan on the connector with only 3 pins will still get power, ground, and the PWM control signal from the motherboard, but you won't be able to measure its RPM.

will this work for 2 fans that both have 4 pin connector?

Yes. One cable is 3 pin (slave) so the speed sensor works off the 4 pin side.

Can 3-pin fans be used with this adapter? i'm using two corsair rled fans and two that came with the 100r case.

This will allow you to use both fans, but beware, it will not allow you to adjust the fan curves at all. I used several programs including the MOBO's own settings to try and change it.

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All Black Sleeved PWM Fan Splitter Cable 1 to 2 Converter, 2 Pack

All Black Sleeved PWM Fan Splitter Cable 1 to 2 Converter, 2 Pack

Product ID: 263644168

Details

Brand
JBtek
Connector type
Auxiliary
Cable type
AUX
Compatible devices
Cellular
Special features
Tangle Free

🔌1-to-2 PWM fan splitter

🖤All black sleek sleeved design

⚙️Prevents signal conflict with pin removal

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P520

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Description

🖤 Double your cooling power, halve your worries.

CONFLICT FREE SIGNAL - Innovative pin removal design ensures flawless fan speed measurement and zero interference.
DUAL FAN POWER BOOST - Connect two PWM fans on a single header without losing control or speed accuracy.
COMPACT LIGHTWEIGHT - At just 9g and portable size, it fits perfectly in any PC build or maintenance kit.
PLUG AND PLAY SIMPLICITY - No drivers or software needed—just connect and optimize your cooling setup instantly.
SLEEK DURABLE SLEEVED CABLE - Premium all-black sleeved cable blends seamlessly with your build while enhancing durability.

The JBtek All Black Sleeved PWM Fan Splitter Cable 1 to 2 Converter (2 Pack) enables simultaneous connection of two PWM fans to a single motherboard header. Designed with a pin removal to prevent signal conflicts, it ensures accurate fan speed control. Its sleek all-black sleeved design offers durability and aesthetic appeal, making it an essential upgrade for efficient and stylish PC cooling.

Specifications

ASIN	B01EF9OI0O
Brand	JBtek
Brand Name	JBtek
Cable Type	AUX
Cable type	AUX
Color	YTGY-KL
Compatible Devices	Cellular Phones
Compatible Phone Models	Iphone
Compatible devices	Cellular Phones
Compatible phone models	Iphone
Connectivity Technology	Wired
Connector Gender	Male-to-Male
Connector Type	Auxiliary
Connector type	Auxiliary
Customer Package Type	Standard Packaging
Customer Reviews	4.7 out of 5 stars 10,567 Reviews
Indoor Outdoor Usage	Outdoor
Item Shape	Round
Item Weight	9 g
Manufacturer	Ymdei
Model	EL0073
Number of Items	2
Other Special Features of the Product	Tangle Free
Special features	Tangle Free
UPC	702679905487
Unit Count	2 Count

Reviews

S**C

Product return

5.03.2022

B**S

Great splitter for fans!

26.02.2026

D**E

Worked well

15.08.2025

Y**D

ممتاز

فك ازمة

5.08.2023

P**M

Quality is good. All the connected fans work without any issues

5.01.2018

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