Fan ports

[xXdragonbatXX]

So my fans are 3 prong but the slots for them are 4 prong, is it ok to plug them in there still?

 

[coffeejunkee]

Yes, and there's only one way they will fit.

 

[tarmc]

yes its ok to do so, but i do wonder what the 4th prong is for?

 

[Eureka]

yes its ok to do so, but i do wonder what the 4th prong is for?

PWM control.

 

[coffeejunkee]

PWM control.

That's what it's meant for, but on many motherboards the 4th pin on the casefanheaders isn't used at all and the fans are in fact voltage controlled.