I have an 8 card rig getting 8k/s total.

5- MSI RX470 8GB mining edition
3- Nitro RX570 4GB

Im getting 980 h/s from the 470s and 1k/s from the 570s but at 125 watts per card.  Total rig power at the wall is 1000watts.  Is there any way I van lower the power draw???