So I have a gaming PC (specs listed in my profile) and the case I have (Fractal Design Define R4) came with 2 140mm fans. It runs perfectly cool unless I am running graphically-intense games, which then my R9 280X proceeds to act as a space heater. I want better airflow in my case, because one is an intake and one is an exhaust, so I will be buying another 140mm fan. My question is this: should it be an additional intake fan or an additional exhaust?