If your system meets or exceeds all requirements to use the GPU and it does not work at defaults then the card is defective and you should talk to the cards maker (Saphire) about support options including up to an RMA for a card that works.
You gave no system specs so it is hard to evaluate if a system incompatibility could be at play.
You can contact AMD support here as well if you like: https://www.amd.com/en/support/contact-email-form