Okay, so 6800 XT bios loaded, then you set gfxclk to 2600 (in MPT or do you mean Adrenalin?), then TDV Vmin to 1025 mv?
Now wait, 6010 mhz?! :d You lost me here...
I did manage to max out Adrenalin with 1100mv on TDV Vmin/max and 2138 mhz on vram but that is not really healthy in the long run...