This setting is ideal for testing each GPU and set to its maximum performance especially when each card is different brands/models/editions/etc.
For my example, I have 2 same FXF and 1 older version of FXF 7950s.
I made 2 batch files.
#1 miner_start0.bat
#2 miner_start1.bat
In miner_start0.bat, it’s designated for the older version of XFX. So, in the batch file I included -d 0. This isolates control of all but the card that is recognized as 0 on your motherboard.
In miner_start1.bat, it’s designaed for the 2 other XFX. So, in the batch file I included -d 1,2. This controls 2 other XFX cards at once.
If you run only miner_start0.bat file, you will see device 1 and 2 are shown “OFF”.
This is picture of my system running miner_start1.bat file with device 0 “OFF” and 1 and 2 are running.
If you want to control each GPUs separately, you can do so by putting -d # on each batch file.