How many volts does a 2 pin fan connector supply?

TheAppleKid2011 · Oct 26, 2013

I know there's 3 and 4 pin fan connectors on motherboards that supply 12V,
but what about those small 2 pin ones?
I see them on entry level or older graphics cards for those small fans on them, and I want to know how much voltage they supply because I bought some small fans with 2 pin plugs on them. They are 5V fans and I want to power them with 3 pin connectors, since I don't have any 2 pins. So if I do that will they be overvolting or will it adapt to 5V automatically?

So basically all I want to know is how many volts do 2 pins supply, since 3 and 4 pin connectors supply 12. Thanks.

Viking2121 · Oct 29, 2013

4 pin = They have a 12v wire and a 5v wire along with a ground and sensor wire.

3 pin = 12v wire ground wire and a sensor wire

2 pin = 12v wire and a ground wire

a 4 pin can use less power then that of a 2 pin fan. I have a high static pressure fan in my system (Ultra Kaze 3pin) which uses 0.67amps at 12v which is 8 watts.

0.67a x 12v = 8.04 watts.

But some 3 pin headers on a mobo can lower the voltage to the fans down to 5v so 0.67a x 5v = 3.35 watts.

My old CPU 4pin fan is 0.15a at 12v so thats 1.8watts.

gotta know the amps and volts, most being around 12v. and multiply amps to volts and you will get what that fan will consume at full load.

EDIT: You can use a 3 pin fan on a 4 pin head, you can even use a 2 pin fan on a 4 pin head. You can also use a 4 pin fan with a 2 pin header or a 4 pin on a 3 pin header. Most fan headers have a slide the will kinda hook the plugs in place, I run a few 3 pin fans on a 4 pin head, I run my Corsair h100 on a 4 pin header and its on a 2 pin plug (took the sensor wire off, use to be a 3 pin).

Also most fans that are rated at 5v will do 5v if 12v is supplied to them. You wont overvolt it as the fan with that plug is made to convert 12v to 5v to put it simple.

TheAppleKid2011 · Nov 1, 2013

Viking2121 :

4 pin = They have a 12v wire and a 5v wire along with a ground and sensor wire.

3 pin = 12v wire ground wire and a sensor wire

2 pin = 12v wire and a ground wire

a 4 pin can use less power then that of a 2 pin fan. I have a high static pressure fan in my system (Ultra Kaze 3pin) which uses 0.67amps at 12v which is 8 watts.

0.67a x 12v = 8.04 watts.

But some 3 pin headers on a mobo can lower the voltage to the fans down to 5v so 0.67a x 5v = 3.35 watts.

My old CPU 4pin fan is 0.15a at 12v so thats 1.8watts.

gotta know the amps and volts, most being around 12v. and multiply amps to volts and you will get what that fan will consume at full load.

EDIT: You can use a 3 pin fan on a 4 pin head, you can even use a 2 pin fan on a 4 pin head. You can also use a 4 pin fan with a 2 pin header or a 4 pin on a 3 pin header. Most fan headers have a slide the will kinda hook the plugs in place, I run a few 3 pin fans on a 4 pin head, I run my Corsair h100 on a 4 pin header and its on a 2 pin plug (took the sensor wire off, use to be a 3 pin).

Also most fans that are rated at 5v will do 5v if 12v is supplied to them. You wont overvolt it as the fan with that plug is made to convert 12v to 5v to put it simple.

Thanks Viking, helped me a lot.

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How many volts does a 2 pin fan connector supply?

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