actually you posted this question on the other thread,..anyway, i think its better for the fans to get direct power from the psu.
i've read somewhere that you lower fan noise by lowering the fans rpm by connecting the ground(black wire) to the red wire. this will lower voltages supplied to the fan..lowering its rpm.
anyway,...better read further about this,..i'm not too sure,..it might screw up your system or something. i havn't really tried it.
i like my fans running 100% full voltages and all. i have this set-up with my first pc...8 case fans and it sounds like thundering f-22s