Hy can you maybe even solve the mystery

Have an ARES boot 2 card from asus and the SR-X motherboard from evga when he first recognized the card, the restart over and over again is error D6

1) a different graphics card works tested with a 7970 by Saphirre!
2) The ares 2 shows the error-D6 in each tested pci slot!
3) bios already tried 12:08 and 0020 without success problem-D6 continue to 7970 radios without problems on all slot

has anyone here a great solution for this trouble.