Do u have the same issue if you mine different algorithms?
I would suggest to change your OS to w10, it deals better with newer drivers
I'll try Win 10 tomorrow
Connect only that card you have problem with to the mobo , reset all overclocking settings to default .
reset all settings in wattman , radeon Settings - gaming - global settings - global wattman - reset - yes
if you are using afterburner to tune all of your cards at once, that tune settings might not working for all your cards.
Sometimes working fine with XMR , ZCASH but not mining ETH . All tree algo need a different tune setting to get out the max from your cards .
Sure I did all of this many times and all my other cards are working fine
Did you try the other bios? The nitro has 2 bios first of all try the other bios
if that didn't work you can try to mod your bios maybe that will help.
I didn't change bios but I was thinking about it