https://www.posetteforever.com/viewtopic.php?f=34&t=3449&p=41205#p41205
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Tormie
Saturday, 04 April 2009, 03:03 AM

Re: These Fans Are UnCool
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Yes, this is simple, use a free molex connector for hard disks

the output is yellow wire = 12 volts red wire = 5 volts

you can find a "female" molex and do the job cutting the wires, there are also adapters where you can plug in directly the CPU fan without cutting wires.

set the fans in place and connect them to a HD connector, the graphic card one, that is 5 volts to the red wire and one of the black wires, the cpu one to the yellow wire and one of the black wires 

I've a simple analog fan controller, apart for the cpu that has a bypass in order to use the thermal control of the computer (the bypass spins up the fan even if I've set it up at low speed in case of need) every other fan is connected to it, but the simplest way is to do what I suggested to you, connect them to a power source and they will spin at maximum speed, that is the safest way, the "simplest" power source is a HD Molex connector.

I don't use the power source of the video card, because it can fail: there is an additional circuitry on the video card that controls the fan, I prefer to have it bulletproof and the fan connected directly to the Power Source Unit , same for the CPU, apart for the bypass it's better to have the fan connected directly to the PSU, maybe more noise, but it's safer.