Is it ok to plug a case fan in a pwr MB connection?

[johnnyblazzwa]

out of four pin's on my psu and need an eighth for the right fan on my cm 690 case. Would it be alright to use the PWR connection on the motherboard even though its supposed to be for a psu?

[M1K3Z0R]

AFAIK, that PWR connector is intended to report back the fan speed of the PSU. Depends if it has a +12v pinout, but if you connect it and the fan doesn't spin, there is your reason

[Zero82z]

Are you talking about plugging the 4-pin female molex connector from the fan into the male molex connector on the motherboard? If that is what you mean, then no, you can't do that.

[johnnyblazzwa]

Originally Posted by Zero82z

Are you talking about plugging the 4-pin female molex connector from the fan into the male molex connector on the motherboard? If that is what you mean, then no, you can't do that.

no, its a three pin without the adapter. I know it will plug in i'm just not sure if my pc with blow up or something haha. reading on another forum that it will work as long as the fan has three live wires

trying something new, instead of buying a low pro 80mm fan for the right side of my 690 i'm gonna stick a stock cpu heatsink fan over there as when you place it off axis (like a diamond) up to the side panel vent/holes the top and botto hole seem to line up perfect so i would just attatch it to the sidepanel instead of inside the case where the 80mm fan would go. just need to get an extension cause the wire wont reach

[johnnyblazzwa]

Originally Posted by M1K3Z0R

AFAIK, that PWR connector is intended to report back the fan speed of the PSU. Depends if it has a +12v pinout, but if you connect it and the fan doesn't spin, there is your reason

got ya. this must be where that third wire comes in.

[Zero82z]

The third wire (yellow) is for RPM monitoring. The red one is for power and the black one is ground. You only need the red and black wires for the fan to run. If the fan header on the motherboard has three pins, it should work fine.

[Varroa]

I do it all the time. I have one plugged into my PWR header right now and it works fine. BIOS shows a low RPM warning but that is all.

[johnnyblazzwa]

nice

how exactly does the fan run? one speed? is it audjusting with the psu temp? fast? slow?

[johnnyblazzwa]

so much for a old heatsink fan working, spins way too fast (jet engine)when plugged into a regualr 4 pin with adapter so i would assume the same on the pwr connection. i'll have to buy a 80x15 mm fan from memory express