There are reports that CD has a much higher power use output compared to the other miners as well, which would probably lead to more hashrate. Can you check that as well?
"Power use output", contradictory 
Obviously power usage will be higher if miner is optimized to use cores as much as possible.
Any lyra2z hashrates from 1080 users out there?
Palit with gamerock premium BIOS on stock (2GHz/9.5GHz) ~2.7 MH/s.P.S. Still don't understand why everyone is posting +core/-mem, those values are useless. + and - from what?
It's like all 1080 have the same frequencies in BIOS and same chip quality :facepalm: