Understanding case fan connections

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I've been googling this for a while now and I think I got the hang of it.
3 pin usually gives you 12v depending on your MB
4 pin PWM varies, can be changed
4 pin Molex from PSU has 5v (red) and 12v (yellow)

I figured that when I connect a 3 pin case fan to a Molex fan controller I can adjust speed.
When I connect a 3 pin fan to a 4 PWM port on a MB I get 12v

True or false?

NB Fan controller in question is the Aerocool F6XT
 
Solution
clutchc
A little of each.
All case fans are 12V DC.
el1iB62.png

The small 3 pin connector fans have a (+), (-), and a tach feed back. Speed is controlled by varying the voltage.
The small 4 pin connectors have a (+), (-). tach feedback, and a PWM signal. Speed is controlled by varying the DC pulse width.
The large 4 pin Molex uses just the (+) and (-). Speed is constant unless controlled by a device upstream from the connector... as in your AeroCool F6XT Controller
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clutchc

clutchc

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A little of each.
All case fans are 12V DC.
el1iB62.png

The small 3 pin connector fans have a (+), (-), and a tach feed back. Speed is controlled by varying the voltage.
The small 4 pin connectors have a (+), (-). tach feedback, and a PWM signal. Speed is controlled by varying the DC pulse width.
The large 4 pin Molex uses just the (+) and (-). Speed is constant unless controlled by a device upstream from the connector... as in your AeroCool F6XT Controller
 
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