power for case fans(psu or mobo)(3 pin or 4 pin)?

[augustwest]

should any of my case fans be receiving power from my motherboard or should they all be hooked directly to the psu with 4 pin connections? my case is going to have 4 case fans and i need to know whether they should have 4 or 3 pin connections before i make a purchase.

thanks for all the help folks