Do you have a fan that's just to darn noisy? Well, if you have case fan that's fitted with a 4-pin Molex male/female pair of connectors, you can modify to run at a lower voltage using this modification.
The 4 wires carry +12 volts (yellow) and +5 volts (red) supplies with two 0 volt grounds (black) . The fan leads are normally connected to the yellow and a black wire for the standard 12 volt supply, but if connected to yellow and red the fan sees 12 - 5 = 7 volts.
Working from the open ends of the connectors, gently press in the two metal thingies on the Molex pins connected to each end of the black wire that the fan's black lead connects to. I use an electronics prodding tool. The metal thingies are very delicate so just push them enough to pull the wires out.
Next do the same for the pins at each end of the red (5v) wire.
Pull the metal thingies back out a bit. Next swap the two wires over, and push the pins back into the Molex housings until they click into place. That's it!
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