one of my rids only four 280X ,and it can run with  the command like this

clpts_x86-64 -o 6 -u xxx.xxx:xxx -t 0,1,2,2,3,3 -a 0

but when i change it to this

clpts_x86-64 -o 6 -u xxx.xxx:xxx -t 0,1,1,2,2,3,3 -a 0  or
clpts_x86-64 -o 6 -u xxx.xxx:xxx -t 0,0,1,1,2,2,3,3 -a 0

the program will crash and quit .

why ?