Is there a way bminer work with 13 gpu (nvidia) ?
Linux supports only max 12 GPUs WITH video output.
If you have GPUs without video output, then you can use more than 12 GPUs in one rig for mining.
Windows supports 13 Nvidia regular gpus, plus 8 Mining GPUs. In total you could run 21 Nvidia GPUs on windows without issue (13 GTX, 8 P100 series), and has been done.