Power supply fan connection?

[johnjk]

I got a new "old" case with an Antec PP-303XP power supply. There's a fan lead (I think) with a black and white wire coming out of the PS.
I'm not sure what this is for and if I need to connect it to my motherboard (Asus A7V333). The power supply fan is working of course with this connected. Is this wire just some sort of thermal sensor? If I need to connect it, should I connect it to the PWR_FAN connector or the power supply thermal sensor connector. The pwr supply thermal sensor connector is only 2 pin and the connector out of the power supply is 3 pin (even though there's only 2 wires) so I wouldn't think it goes there. Anyway, as you can see I'm totally confused. I would really appreciate it if someone would clear this up for me. Thanks.

 

[iZero]

The rear fan on my Enermax 350 watt PSU has a connector that comes out with the other wiring. It needs to be plugged into a fan header to function. The bottom fan on the power supply is wired directly however.

 

[techfuzz]

Could be a fan speed control wire or maybe like iZero said it might power the bottom fan. It definitely sounds like it plugs into a header on your motherboard though if it has the 3 pin connector.

techfuzz

 

[BoomAM]

I have a similar thing on my PSU. i plugged it into a fan connector on my MoBo, and it give me reading on my power supplys fan. Like RPM.

 

[paralazarguer]

Yes. All it is is a RPM monitor for the fan. You can tell by the wires he described. A lot of power supplies have this.