Because you said its not 3pin, im taking it your Fan is connected through a molex connector.
In that case, why dont you just switch the position of the 12V and 5V leads, and run it at the 5V speed. You simply just take out the yellow and red wire ends from the molex connector for your fan, and switch their positions, so the 12V recieves 5V and the 5V recieves however much the fan is set up to recieve.
That solution is free.....
Oh and btw, the fan controller that was shown, the coolermaster one or whatever, is in that new 2700 Dollar Compaq Gaming machine, and it is pretty nice. Its 50 dollars at Comp USA alone though'
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