it s actually hard to identify  in the miner , in msi afterburner and wish pci-e slot it is, is actually difficult to see because nothing match

i run one at slow speed to identify it ,

also you cannot trust the fan speed showing in claymore  it doesn't match the gpu in miner in claymore

 i first tried like this , i got gpu 0 hang .. in claymore

so in msi afterburner i  start the fan at high speed  for gpu 0 than 1 ..   and see in claymore when fan from gpu 0 get high so i know with one it was but it was not right
 i notice  the fan showing in claymore for gpu0  was actuality gpu 2   lol  

so to identify the gpu i run it at very low clock speed  and check the hashrate to see with one it is

and for some miner you have to restart the miner to get change, for exemple the cryptonight miner  doesn't matter what clock you put on the gpu or memory  after miner is started, it has no effect , you can only change frequency before starting the miner