Running 6 cards on a onda riserless mobo, 1500w at the wall, 490mh/s.
1575 clock, 860mv, 950 mem phoenix miner.
Something seems to be sucking up power unnecessarily in your setup - I ran same settings but w/ my mem just a touch lower (935), and only saw 215w/card - looks like you're at 240-245 for some reason, which is generally more in-line w/ the 90Mh/s config.