System fan control

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wotg

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Jul 7, 2014
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Just bought a new Gigabyte MB, H81M-S2PH. There are 4 pins in the system fan header. Pin 4 is named +5V. Is this MB capable to control system fan system via pwm? I am asking this question because I would like to know whether it worths to upgrade my current 3 pins system fan to a pwm fan.
 
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wotg

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Jul 7, 2014
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Thanks Outlander_04.

In my case, Pin 4 is labelled as +5V. What does it actually mean?

Other MB in the H81 series have Pin 4 labelled as VCC. What does VCC mean?

Also, what are the advantages of connecting to a molex instead?

 
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Outlander_04

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Nov 18, 2008
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I dont see a 5v label when I look at the motherboard on its webpage , and when I look at the GA-H81M-HD3 I have here its labelled identically . Looks just like a PWM fan header to me and that is the only reason to add the forth pin .

Im not using the one I have here BTW . I am connected directly to molex with a 7 volt mod to lower the fan speed .I prefer that to the variation in fan speed which I think would be noticeable in an HTPC

Im sure that is a PWM header on your board
 
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wotg

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Jul 7, 2014
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10,510
The pin labels of my Gigabyte motherboard and a few others are as follows:

H81M-S2PH
GND, Speed Control, Sense, +5V

H81M-HD3
GND, +12V/Speed Control, Sense, VCC

H81M-DS2
GND, +12V, Sense, Speed Control

Pin 4 of these MB are quite different: +5V. VCC and Speed Control. Could someone enlight me what do they mean by +5V and VCC?
 
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