So I have this zalman t4 mATX case, which doesn't have a descent airflow. My gpu temps go up to 81c while gaming with the fans on 100%. I know it's not that bad, but I want to upgrade my graphics card to possibly a gtx 1660ti or a rtx 2060. Maybe these cards will run hotter and that would be a problem. Can you give me some tips for a better airflow? Can I put a second chassis fan on the front ( The case supports a second 120mm front fan but I don't see any available space there) to save money, or should I buy a new case?