I asked ASRock how much power each fan header can put out, this is what they said.
motherboard support 12 volts dc , 1 amp maximum , 12 watts per pin out header.
I have 6 case fans at all and they are Bitfenix Spectre pro 140mm fans. 2 in the front, 2 up top, 1 in the back, and a be quiet...