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adycopilu


No need for adapter, actually I don't think there is any simple adapter for that.
pin1 & pin2 - +12V and ground, used to power the fan
pin3 - rpm sensor
pin4 - gives PWM control over the rpm

In a 3-pin configuration, the mobo can modify the speed of the fan by adjusting the voltage on pin-1 (+12V line). The less the voltage, the lower the rpms. However, at very low values (like below 5V) the fan will not spin anymore.

In a 4-pin configuration, the mobo can modify the speed of the fan by using PWM signal. The power pin will supply constant +12V voltage, but the 4-th pin will supply a high-frequency 0/1...
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USAFRet

USAFRet

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Yes.
The heatsink has little to do with the PSU. All that is being powered is a standard fan.

Will it work with the socket on your mobo is the question.
Intel: Socket LGA1366 / 1156 / 775/1150
AMD: Socket AM3 / AM2 / 940 / 939 / 754
 
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AM4N

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Jul 2, 2013
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Thank you for your reply.

I think I have a AM2 Socket. Also my fan connector is a 3pin, so it won't work damn
 
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USAFRet

USAFRet

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The CPU fan connector is only 3 pin?
 
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AM4N

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Yes the Heatsink/Fan I want says it's a 4 pin-connector. Is it possible to buy some sort of adapter? My cpu fan is a 3 pin one








 
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adycopilu

adycopilu

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Mar 8, 2013
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No need for adapter, actually I don't think there is any simple adapter for that.
pin1 & pin2 - +12V and ground, used to power the fan
pin3 - rpm sensor
pin4 - gives PWM control over the rpm

In a 3-pin configuration, the mobo can modify the speed of the fan by adjusting the voltage on pin-1 (+12V line). The less the voltage, the lower the rpms. However, at very low values (like below 5V) the fan will not spin anymore.

In a 4-pin configuration, the mobo can modify the speed of the fan by using PWM signal. The power pin will supply constant +12V voltage, but the 4-th pin will supply a high-frequency 0/1 (logical) signal. This is used to command the rapid power-on and power-off of the fan, depending on the "shape" of this signal. It's like turning the power on and off fast enough so that fan senses it like: a constant power feed, but with less voltage.

Mobo with 4-pin, fan with 3-pin: fan will work at full rpm all the time.

Mobo with 3-pin, fan with 4-pin (your case): fan speed will be controlled by voltage adjustments. No issues, no harm, actually even better than the PWM solution (PWM controlled fans tend to give annoying clicking noise).
 
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