I have a GPU that is acting up, its hashing way less than the others....i can see its not stable in afterburner.....but for the life of me i cannot figure out which one it is. I have 8 of them running

I hope someone out there has run across this issue and can shed some light

meaning is the first one on the board GPU 0 and the next is GPU 1 etcccc... ?

Thanks in advance