Thanks for this. I've been playing with the power settings with a Sapphire RX Vega 64 Liquid Cooled and got 1990.7 H/s stable @ 0.875 VDDC. Couldn't get power draw at the wall because I need a kill-a-watt thing.
Vega is running thread 3 and 4 with 2600+1800 intensity (threads 0/1 is a RX 560 and thread 2 is a R9 Fury X).

Wow first time i know it, so using vega is like using dual vga now?
i think7990 with dual R9 280x is better than vega?
but the power of vega and 7990 is high, curently im using only Rx 480/470 and not have any plan to using vega