Flash this https://www.dropbox.com/s/glvnf25mmqo4r4x/SAPPHIRE_E20800_AGR.zip or this https://www.dropbox.com/s/ft3dfk93hpnsmia/100351-6GVXSR_AGR.zip

But before you need a compare your bios version with this two, because 7970 is very wide model name