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Zotac 3080 tirinity problems

hi my friends
i have a problem. thanks if help
i have a card 3080 zotac tirinity .
when i start this card in hive os first minute it have 99mh and after a minute its 75mh .
whats the problem? who can help me
thanks alot
if any one have over clock settings thanks

Just sharing my card is Zotac Trinity OC micron memory. Kind of stable, running for 7 days.