While there may be a (guessing very) small demand for motherboard controlled pumps, etc, the bulk of the noise comes from the fan(s) and NOT a well mounted pump. The rpm monitoring is important in that if it is going down / off, so should the machine.
Most pumps in high-end WC need enough power that it is better to power it off the PSU, since many boards limit fan wattage to 6-8 watts anyway....