I have no issue unlock to the 6970 bio . this card have a switch to select which bio you want to use . you do not need to flash the bio on the card . you do need to completely remove all amd\/ati graphic driver before move the switch to 6970 , then re-install the driver clean . card run cool 99f to 104f idle , to 152f under severe load and overclock . I be use Sapphire TriXX to OC to 880 and 1375 -lrb- stable and cool -rrb- and it moderately raise the temperature and fan speed . I easily push it to 900\/1400 -lrb- stable but higher temp -rrb- with a voltage increase . I be extremely happy with this purchase .