91W for 570?!? Mine are at 70W in SMOS. 850mv for the core is standard. I guess I could reach 23 Mh too for some cards, but it is too much hassle. I set for all my cards daglim to 4074, because some cards crash and each time my rig reboots, it takes too much time to adjust the cards for 4076 or 4078.
These numbers are irrelevant. One can only trust a watt-meter at the wall !
The numbers are quite relevant my fellow miner! The difference from the wall will still be 20W, if it exists for SMOS for 2 cards! There are 40-44W which are not counted by smos and hiveos, these are the watts for the risers and pci-e slots. The total consumption from the wall for my cards is 110-114W, while yours will be 130-134W.

You have to take the efficiency of the PSU ... is not the same 80Plus Silver than a Titanium. Also the temp of the enviroment... a good PSU can really reduce the Watts at the wall