Can i splice a regular fan into my 4pin cpu fan?

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romcaluag47

Sep 24, 2018
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I have a stock 4pin cpu fan, and i know that this fan is being controlled based on a thermal sensor connected to my mobo.

What i want to know is that if i splice a regular 120mm fan with the two wires (positive, negative) into the respective wires on my 4pin cpu fan, is it also gonna be controlled by whatever % my cpu fan is running on???

and if yes, can the header support the 2 fans wattage wise?
 
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The answer is no. In the new 4-pin fan system there are four connections to a fan. Pin #1 is Ground, Pin #2 is a fixed +12 VDC supply, Pin #3 is the fan's speed signal being sent back to the mobo, and Pin #4 is the PWM signal. Inside the fan there is a small chip that uses the PWM signal to modify the flow of current from the +12 VDC supply line through the motor windings to adjust its speed. But his action affects only the current through that one motor, and cannot do anything to external motors attached to the same input leads.

If you were to splice the leads from a 2-wire fan into the Ground and +12 VDC lines, that fan could only run full speed all the time. If you use the Splitter linked by Vic 40 above, you'd get the same result...
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Paperdoc

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The answer is no. In the new 4-pin fan system there are four connections to a fan. Pin #1 is Ground, Pin #2 is a fixed +12 VDC supply, Pin #3 is the fan's speed signal being sent back to the mobo, and Pin #4 is the PWM signal. Inside the fan there is a small chip that uses the PWM signal to modify the flow of current from the +12 VDC supply line through the motor windings to adjust its speed. But his action affects only the current through that one motor, and cannot do anything to external motors attached to the same input leads.

If you were to splice the leads from a 2-wire fan into the Ground and +12 VDC lines, that fan could only run full speed all the time. If you use the Splitter linked by Vic 40 above, you'd get the same result. The only way to do this is to use a Splitter like that and a FOUR-pin (PWM type) fan that DOES have that special chip and can use the PWM signal properly.
 
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