The fan is max 12V but will opperate at lower power for less noise and airmovement, often these fans work reliable on 5V (read NOT all) though doesn't move as much air though does this silently. There are a few ways to go about this.
On the fan black = ground, red = power, yellow = rotationspeed signal.
Connect the red pin on the fan to red pin on one of the molex headers from the PSU will give 5V to the the fan. Connect the red pin on the fan to the yellow pin on one of the molex headers from the PSU will give 12V to the the fan. On both the above suggestions black pin on the fan goes to black pin one of the molex headers from the PSU.
However if you connect red pin on the fan to yellow pin on on of the molex headers from the PSU and at the same time connect the black pin of the fan to the red pin on one of the molex headers from the PSU the fan will get 7V moving more air and still be virtually silent.
