Put all the cards at the same time and pray to god to work at first attempt

If does't work install one by one, it's more guaranteed, but what I said above is true, sometimes I installed all the cards at same time and worked
the gpu number is shuffle at the miner and the overclock program, did you know how to identify which gpu on which riser?
it's very confusing, before i just use 2 gpu, but after 7 gpu the thing is start confusing.