I am reviving this thread because 200mm vs 2x140mm is still a relevant topic and previous points are still valid. I have an Enthoo Evolv ITX case with a Cryorig H7 cooler and the original 200mm case fan. I have modified the front panel by drilling 35 half inch holes. But, I'm still not happy with the airflow. The max CPU temps are 6 C lower with the side panel off, so I know the cooler can perform better, which is why I'm considering trying 2 140s. How are members coming to the conclusion that 2 140s would provide better cooling? My thinking is that higher quality fans could push more air due to higher pressure, but I don't know. Mathematically, the area of a 200mm circle is slightly larger than the area of 2 140mm circles.
A ≈ 31415.93
vs
A ≈ 15393.8 x 2
Has anyone actually tested 200mm vs 2 140s?