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

Product ID: 28340445

Details

Brand
JBtek
Cable Type
Component
Compatible Devices
PC
Connector Type
Auxiliary
Special Feature
Tangle Free

📏240mm length ideal for mid-tower builds

🔌1-to-2 PWM fan splitter compatibility

🖤All-black sleek sleeved design

227 Kč

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Sold byAmazon Czech RepublicDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🖤 Double your cooling, halve your hassle — sleek splitter power for the savvy builder.

VALUE PACK OF TWO - Get double the convenience and backup with two splitter cables in one affordable package—because one is never enough.
DUAL FAN POWER BOOST - Split one PWM header to control two fans seamlessly, doubling your cooling potential without extra motherboard ports.
PERFECT LENGTH FOR MID TOWERS - 240mm cable length optimized for clean, efficient routing in popular mid-tower cases like Lian Li and Lancool Mesh II.
SLEEK ALL BLACK SLEEVED CABLE - Elevate your build’s aesthetics with a premium, tangle-free black sleeved cable that blends perfectly with any setup.
UNIVERSAL CONNECTOR COMPATIBILITY - Supports both 4-pin PWM and 3-pin fan connectors, ensuring versatile compatibility with a wide range of PC fans.

The JBtek All Black Sleeved PWM Fan Splitter Cable 1 to 2 Converter (2 Pack) offers a tangle-free, all-black sleeved design with a 240mm length, enabling users to power and control two PWM fans from a single motherboard header. Compatible with both 4-pin PWM and 3-pin fan connectors, this splitter is perfect for mid-tower PC builds, delivering reliable performance and enhanced cooling flexibility.

Specifications

ASIN	B01EF9OI0O
Best Sellers Rank	#235 in Computer Internal Components
Brand	JBtek
Brand Name	JBtek
Cable Type	Component
Color	black
Compatible Devices	PC
Compatible Phone Models	iPhone
Connector Gender	Male-to-Female
Connector Type	Auxiliary
Customer Package Type	Standard Packaging
Customer Reviews	4.7 out of 5 stars 11,087 Reviews
Indoor Outdoor Usage	Indoor, Outdoor
Item Length	24 centimeters
Item Shape	Round
Item Weight	9.07 g
Manufacturer	JBtek
Model	EL0073
Number of Items	2
Number of Pins	7
Other Special Features of the Product	Tangle Free
Part Number	EL0800
Recommended Uses For Product	Computer cooling
Special Feature	Tangle Free
UPC	702679905487
Unit Count	2 Count

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