Ahhh…Ok. I have it at 990mV now and hashrate is stable at 46.7. It was just above 47 when I first used your settings, but the room has warmed up a few degrees and the GPU’s have warmed up.
I don’t know what is wrong with GPU 0, as the hashrate is down and it won’t allow me to set mem clock over 1000. As soon as I do that, it goes down to about 9 MH/s with about 59 Watts. I’m suspecting the riser is bad or something. On the 6800’s I also noticed the hashrate went down as the miner heated up.