Thanks for remind sorry I rarely asking questions.
I was using TRM 0.8.3 Fan 65% Core 1275 Mem 1066.
But intereting is that I had 8 cards. all the same.
Wondering if just this one with problem only and need RMA.
Now its a 6800 Running with 38.22 M hash.
I tried NBminer 38.1 and it’s running 30.09 M hash.
I have tried several riser (and different model of riser too)
Its also not stable in windows.
I can’t reach THAT 6800 or I will try with x16 slot.
But its still not good to use x16 slot to mine. since I have at least around 6 cards to mine together.
I think I will send RMA if I had no other way to solve this problem.
Thanks again everyone.