can you post the output of hashcat -I
EDIT: was missing this part - Any of 7 cards works stable. The problem start with 8th device
-> did you used -D 2 -d 1,2,3,4,5,6,7 to use only 7 cards? if not see comment below
yeah like slyexe was mentioning, seems to be a problem with your system ram, you could use options -D 2 -d 1,2,3,4 ... to tell hashcat just to use the first x cards and see if this failure disappears
never the less, plz show output of hashcat -I
EDIT: was missing this part - Any of 7 cards works stable. The problem start with 8th device
-> did you used -D 2 -d 1,2,3,4,5,6,7 to use only 7 cards? if not see comment below
yeah like slyexe was mentioning, seems to be a problem with your system ram, you could use options -D 2 -d 1,2,3,4 ... to tell hashcat just to use the first x cards and see if this failure disappears
never the less, plz show output of hashcat -I