Speed Wire only connected to Mobo

[Mike360000]

Quick question;
I'm installing a new fan on my cpu.
Can I take the speed sensor wire and hook ONLY it to the mobo header where I normally attach it for my cpu fan power, while using the molex connecter for my power. (New fan has both connections. Also I don't know the name of the small connecter that attaches to the mobo.)

I would cut the black and red wires leaving only the yellow sensor wire attached,

Reason being I want to use a fan control center to adjust fan speed and it uses molex connecters, but I still want to read my fan speed.

Thanks,
Mike

[adrian nelson]

i belive you can because my current cpu hsf dose that,
its a coolermaster xdream

[archilochus]

YES ,you are correct.Take a look at this.WIRE LINK (http://2cooltek.safeshopper.com/58/300.htm?530) You probably already have one of these.
THE FANMAN:cool:CONN LINK (http://www.sidewindercomputers.com/spco.html) This shows the connecter in question.

[zebkoolindc]

I was wondering how one wire can carry a signal ?
I thought electricity always needed two wires?

just wondering

[archilochus]

Dude that rpm wires is not a power wire but a sensing wire,
reporting rpm to mobo.:D The power wires for the fan can be connected to the PSU or a fan controller.Originally all three wires are conn. to the mobo header.Some fans draw to much for the mobo, so people wire the HSF to either a controller or the PSU.Most OC'ers prefer to have control of thier HS./FAN speed.
The red and black wires on the fan are the +12v & -12v.These are the fans power wires. THE yellow wire on the fan is the rpm sensing wire.As far as I know on a Intel based mobo the rpm wire
needs to be present or the computer may shut down,because it thinks there is not a fan on the CPU/ HS.Its a fail safe feature to keep the CPU from burning up.Hope this helps you.If more Q's
you may want to post a thread.THE FANMAN:cool:

[Sonny]

Originally posted by Mike360000
Quick question;
I'm installing a new fan on my cpu.
Can I take the speed sensor wire and hook ONLY it to the mobo header where I normally attach it for my cpu fan power, while using the molex connecter for my power. (New fan has both connections. Also I don't know the name of the small connecter that attaches to the mobo.)

I would cut the black and red wires leaving only the yellow sensor wire attached,

Reason being I want to use a fan control center to adjust fan speed and it uses molex connecters, but I still want to read my fan speed.

Thanks,
Mike

Yes you can still monitor fan RPM with just the signal wire to the mobo. The problem might be when you turn down the speed/rheostat the signal might be too weak to get an accurate reading from the fan.

Originally posted by zebkoolindc
I was wondering how one wire can carry a signal ?
I thought electricity always needed two wires?

just wondering

Good question:beer: It's because everything has a common ground so the circuit is complete even if your ground comes direct from the PSU so the motherboard can still read the RPM signal. Now if you ran a 7V mod you dont have a common ground & will not ahve RPM monitoring, also if you used a totally separate PSU to power the fans you will not be able to monitor RPM.

[Mike360000]

Originally posted by archilochus
YES ,you are correct.Take a look at this.WIRE LINK (http://2cooltek.safeshopper.com/58/300.htm?530) You probably already have one of these.
THE FANMAN:cool:CONN LINK (http://www.sidewindercomputers.com/spco.html) This shows the connecter in question.

Dawg gone it, I just ordered from them!
Well I'll just cut and fix the wires like I was intending anyways.

Thanks for the input evreybody.

Cheers,
Mike

[Mike360000]

Just a quick followup.
I just recieved my fans from FedEx.
I had ordered a ThermalTake Smart Case Fan 2, among my other parts. Well that Smart Case Fan 2 had exactly what archilochus linked us to in his post "Wire Link"
http://2cooltek.safeshopper.com/58/300.htm?530

Seems everything worked out better than I had hoped.
And I didn't even see that little wire listed in the Smart Case Fan's specs.

Cheers,
Mike

[archilochus]

Great, Glad to be of some help to somebody.THE FANMAN:cool: