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.

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: 233350011

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Details

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

🔌1-to-2 PWM fan splitter

🖤All black sleek sleeved design

⚙️Signal conflict prevention pin removed

Description

🖤 Double your cooling, halve your worries with sleek splitter power!

DUAL FAN POWER BOOST - Split one PWM socket into two for enhanced cooling control
COMPACT LIGHTWEIGHT - Minimal 0.02 lbs weight fits seamlessly into any build without bulk
PLUG PLAY SIMPLICITY - No drivers needed, just connect and optimize your airflow instantly
CONFLICT FREE SPEED SYNC - Unique pin removal prevents fan speed signal interference
SLEEK DURABLE SLEEVED CABLE - All black sleeved design for premium aesthetics and tangle resistance

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 to prevent signal conflicts by removing a pin on one connector, it ensures accurate fan speed control. Its all-black sleeved cable offers durability and a clean look, making it an essential upgrade for efficient, quiet, and stylish PC cooling setups.

Specifications

ASIN	B01EF9OI0O
Best Sellers Rank	9,962 in In-Ear Headphones
Brand	JBtek
Cable Type	AUX
Colour	YTGY-KL
Compatible Devices	Cellular Phones
Compatible Phone Models	Iphone
Connectivity Technology	Wired
Connector Gender	Male-to-Male
Connector Type	Auxiliary
Country Of Origin	China
Customer Package Type	Standard Packaging
Customer Reviews	4.7 4.7 out of 5 stars (10,567)
Indoor Outdoor Usage	Outdoor
Item Shape	Round
Item Weight	0.02 Pounds
Manufacturer	Ymdei
Model Number	EL0073
Number of Items	2
Other Special Features of the Product	Tangle Free
UPC	702679905487
Unit Count	2.0 Count

Reviews

S**C

Return due to only one of it is working

5.03.2022

B**S

Great splitter cable! Works as intended!

26.02.2026

D**E

Didn't end up needing these but I did use them for a bit and they worked well very simple

15.08.2025

Y**D

فك ازمة

5.08.2023

P**M

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

5.01.2018

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