I just want to ask which fan would be better to use. What would you guys suggest that I should use if I have a case that has restricted airflow in front which is the Corsair Obsidian 550d. I can't decide between the Noctua NF-S12b or Noctua NF-P12. The S12b provides better airflow and minimal noise while the P12 provides better static pressure but lesser airflow. Help