The problem is until 7 GPU-s it mines fine without problems, the moment I add the 8th-11 GPU-s it shows error, it restarts miner because of 3 GPU with errors, I switch GPU-s errors again.
what gpu error you get exactly ? you got the error in windows device manager or in the miner program ?
Bios updated, configuration of the Bios done correctly
"configuration of the Bios done correctly"
what configuration are you done in the bios ? that mobo really dont need any special configuration , it should work out of the box without any problem , of course updating to the latest bios is perefered....
How is the psu set up in your sysrtem ? What psu's connected to A , B , C on the board ? what psu powering what cards , how many cards ?