if ya temps can stand it you could either switch the fans to 5 volts using the red and the black lead of a molex connector or to 7 volts using the yellow lead as psitive (+) and the red one as negative (-). you can also use rubber grommits to mount ya fans, tehy reduce noise too. i would suggest a 7V/12V fanbus as described @VH
http://www.virtual-hideout.net/guide...us/index.shtml .