Controling a PWM Fan

Hello again :)

A few questions regarding computer fans (PWM) and controlling them with arduino.

The one I'm will be using has a 4-pin connector, The pin layout:

I'm guessing:

Blue- PWM signal

Yellow- RPM sensor

Red- +12V

Black- Ground

So I'm thinking: hook the fan up to 12v and send PWM singals from arduino via the blue wire, would it work?

These links should help

http://www.allpinouts.org/index.php/Motherboard_%28CPU%29_4_Pin_Fan

and

http://www.formfactors.org/developer/specs/REV1_2_Public.pdf

Also more info here

http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1215675974/0