12v to 7v fan mod

[crushing_grief]

I an attempt to quiet my Vantec Tornado 80mm cpu fan, I have decided to try the 12v to 7v mod. My question is how will this effect the specifications/outputs of the fan?

At 12volts, the Tornado is rated as follows: 5700rpm, 84.1cfm and 55.2dBA.

If my simple math calculations are correct, these should be the new output specifications:
3323.1 rpm
49cfm
32.4dBA

Do these numbers sound right? Has anyone tried this mod before? How will it effect performance and noise?

[Liss]

it'll lower performance and noise.. (duh)
just go ahead and try it..
simple mod..

also.. while your at it.. just try it running at 5v too..

[zer0burn]

it lowers the sound a lot but doenst lower the cfm as much. Very good mod espeically for those loud 120mm fans