Bought this PSU without knowing about this annoying noise, so when i did a research it happen that this PSU has the exact same fan than the NZXT C850 V1 (Seasonic) which i own... and it does not produce this noise... so my guess is (need to confirm it doing fan swap, which i will do at some point) Corsair has set the fan curve at the level that make the fan produce this annoying noise and NZXT (Seasonic) hast set the fan curve higher...