Confirmed 13 gpu on whql-win10-64bit-radeon-software-crimson-relive-17.11.1-nov10
Need turn off some cards first (in device manager) to enable compute mode on all cards because theres bug. Once enabled on all, turn on all cards and it stay.
https://ibb.co/jkYpmbCould you give more info, im trying for days to make 12 gpu work but i just cant...What version of windows you use 1703,1709? What motherboard you use? What version of claymore?