You can buy an RTX 3080 for $400 or a 3090 for $650-700 right now. Those can both run the game fine. I got mine from some gamer kid in a beat up van at the gas station and itβs working great.
Stable load is better for GPU longevity than cycling between hot and cold repeatedly. Also, lots of mining farms will undervolt their cards for more efficiency. Getting a used mining card is probably better than getting one from a gamer.