Troubles with AORUS RTX 3080 Master (v2)

Hi there!
I try tu start AORUS RTX 3080 Master (v2) on Biostar BTC-360 Pro.
No modification, standard settings.
The card starts at app. 90 HS, drops after one minute down to 60 HM, andy finally the rig freezes.
Power off, power on, and the same play beginns again.
Has anyone an idea, how to fix this problem?
THX KR, MMH

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