At OP, what resolution are playing in? 1080p high-med this behavior would be odd, in 4K or 1440p widescreen max and this game will cook your card and eat it for breakfast. So lowering resolution could help, also as others have said make sure your fans are working properly and you have good ventilation in your case. The more info you can give, the more we can try to help. What is your hardware specs? What's your in game graphics settings? What games are you playing that you have decent temps in? Any or all of this would help.