"our 3 pronged plugs, why would i be using us plugs?"
The reason I say that is because most computer power supplies only come with 3 pinned plugs (2 Rectangle, 1 Circle - Picture 1).... Unless your place was wired for those type of plugs you will need an adapter to plug it in.
"does that mean i can change the speed of the 12v fan. ?"
No, the voltage switch on the back of the power supply changes the input voltage for the supply itself... So you must match up the voltage coming from your wall to what the power supply needs.... Lets say if you had 220V coming from your wall... If your Power Supply was plugged in and set to 110v, then you would fry the poor thing.
That is why I always reccomend if you dont know how much voltage is coming from your outlets, to set it to 220V first, that way it will either not turn on (Lack of power), or it will be dead on the money.....
If it dosent kick on at 220V then its safe to say there isnt 220V going to the supply so you can kick it down to 110V.
The output going to your fans is going to be a steady 12V from the outputs of the power supply.... CPU fans are rated at 12v so that is the fastest they will go. If you want to slow them down you can do that... But you cannot increase the speed of these fans without more power.... (More power = Shorter Life)
Hope this helps clarify a little...
XS
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