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Solved Forum question
Started by noblephantazm | | 5 answers
I took my old cpu fan 4 wired and rewired it into a 2 wire power supply wire to be a case fan and its constantly running at full speed.
The question is, is it safe for it to leave it spinning at full speed? and if not how can i control it.
Also you have to push start the fan to power it up.
The question is, is it safe for it to leave it spinning at full speed? and if not how can i control it.
Also you have to push start the fan to power it up.
Thanks.
Since everyone seems to have a color code. Intel seems to go
Black = common / negative
Yellow = 12 volts.
Green = Sense(RPM)
Blue = PWM
As long as you connected black to black and yellow to yellow(12 volts). Some fan adapters may use red in place of yellow as it was the default fan color for almost all 3 pin fans.
You can actually just use a 3 pin fan to molex as well. The PWM pin can hang safely over with edge without any issues. PWM fans will run full speed when no PWM signal is detected. I have gone as far as to cut shrouded 3 pin adapters to connect 4 pin fans.
Since everyone seems to have a color code. Intel seems to go
Black = common / negative
Yellow = 12 volts.
Green = Sense(RPM)
Blue = PWM
As long as you connected black to black and yellow to yellow(12 volts). Some fan adapters may use red in place of yellow as it was the default fan color for almost all 3 pin fans.
You can actually just use a 3 pin fan to molex as well. The PWM pin can hang safely over with edge without any issues. PWM fans will run full speed when no PWM signal is detected. I have gone as far as to cut shrouded 3 pin adapters to connect 4 pin fans.
noblephantazm
October 17, 2014 10:42:53 AM
nukemaster said:
Can you tell us exactly what the old wires had been. The push start thing is strange. almost sounds like you have it on 5 volts or something.Running fans full speed do not hurt them as it is part of the design.
4 pin fans that are PWM can be controlled via a signal on the 4th wire. 3 and 2 pin fans are controlled by voltage. so running a 12 volt fan on 7 volts will slow it down and make it more quiet.
Slowing down a fan can extend its life, but running them full speed is not actually going to hurt it.
it was a former cpu fan, and has green,blue,yellow and black wires.
Can you tell us exactly what the old wires had been. The push start thing is strange. almost sounds like you have it on 5 volts or something.
Running fans full speed do not hurt them as it is part of the design.
4 pin fans that are PWM can be controlled via a signal on the 4th wire. 3 and 2 pin fans are controlled by voltage. so running a 12 volt fan on 7 volts will slow it down and make it more quiet.
Slowing down a fan can extend its life, but running them full speed is not actually going to hurt it.
Running fans full speed do not hurt them as it is part of the design.
4 pin fans that are PWM can be controlled via a signal on the 4th wire. 3 and 2 pin fans are controlled by voltage. so running a 12 volt fan on 7 volts will slow it down and make it more quiet.
Slowing down a fan can extend its life, but running them full speed is not actually going to hurt it.
Best solution chosen by noblephantazm
Richard Ricardo
October 17, 2014 10:28:08 AM
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