When you start a miner, one card shows 511 degrees!
Lord, I do not know what to do (
Card RX480 Sapphire
It's not possible for your card to be 511°C. Must be a false reading. Check Radeon Settings temperature reading to determine if the problem is Claymore, AMD or your card.
If the card shows 511 c degree, that mean the card crashed. You need to reduce the frequency.