Wayfall :
My current one has static pressure of 4.27H₂O while the NF-A9 does 2,28H₂O, is this a big difference?
IMO, you can't compare the testing done by different companies. I think there are ways to jimmy the results. Only within the same company would I compare testing results. I just don't believe that the Noctua gets only half the static pressure of the Corsair, unless the Corsair e.g. runs up to 4000 RPM while the Noctua does 1500 max RPM. (thats an example- I didn't check the RPM's of each fan.)