I have a case with 4 airflow and im planing to do 2 more just tell me if the fps will be lower ??Temps may be higher, depending how how good or bad the airflow is through your case. It's possible that the temps are higher enough to slow things down, but unlikely unless your PC case has bad airflow.
I have a case with 4 airflow and im planing to do 2 more just tell me if the fps will be lower ??