Custom Hardware Fan Control - problem if speed pin not connected?

Hi There,
I am planing to install a hardware fan control (poti) to my MacPro 1.1 rear fan. (because I have a defective northbridge temperature sensor and the fan is running at maximum speed... so i thought of slowing it down with a fan control for the pci slots)
I read that the pinning of the Fan is: Gnd, 12V, Speed, Control Pin (analog Voltage)
So when i would attach a fan control (just a poti) between some +5v and the Control Pin I think I should be able to control the fan manualy - am i right?
But then the speed signal is not the speed the mac pro fan control software think of... so would it be a problem e.g. if i disconnect the speed pin from the mainboard fan connector?
what would happen then? is the mac pro powering up the other fans for some kind of failsafe?
Or have you other suggestions how I can lower the speed of the rear fan manually?
thanks in advance,
Stefan

2010 2.8 Special $2119 - and throw in 6-core 3.3GHz yourself for $590
Take a look at the project some have undertaken to go with water block.
Send the motherboard in to have a 'skilled' electrician? repair the board perhaps.
4 fans, 3 under the control of SMCFAnControl utility. Maybe disable the one fan and make up for it with your own fan and running the others efficiently.
There are also VGA copper coolers.
FBDIMMs bleed heat: maybe the RAM fan cooler kit in there to deal with large source of heat. New higher density DIMMs are better made and few DIMMs = less heat even if 4GB.
Use ice packs, dry ice and liquid nitrogen to super cool :-)

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Attachments:
1.png ‏293 KB
2.png ‏291 KB
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