Hello thanks for choosing Dell. “21, 22, 23 and 24”  This is slot priority. [URL] Could you please refer to page 21? You need to run “ Nvidia-smi” command as well as “ LSPCI” with physical BUS number in Idrac and check in the OS.  
Helo guys. Does anybody know how I identify the correct number of a GPU card inside the server. Because watching from the Idrac, I got : 21, 22, 23 and 24......... When I open the server, I see a big label on the cover of the GPUs Bay, with the follow numbers: GPU 1, GPU2, GPU3 and GPU4...................Inside the O.S. (Linux Redhat) and scan for the GPUs I got : 0, 1, 2 and 3.  I need to change a defective GPU card and don't how to pick up the right one. Thanks for help.
Identify the correct GPU Inside Power Edge XE8545