On this forum you'll find loads of different PSU conversions.... Just one example of many:
http://www.rcgroups.com/forums/showthread.php?t=1750411You'll need to jumper a few pins together... but it's really REALLY easy.
Then you can opt for another jumper (of 2 pins) and that will lower the fan speed.
Cool. Thanks. Some neat stuff there. And you can't beat that price per watt.