Soldato
Pretty normal for many builds, you might not always notice it with high quality silent fans or fans connected to a controller that sets a fixed lower voltage(and thus fixed lower speed).
Unless having actually good fan controller like Aquaero or Quadro...Pretty sure this is normal behaviour, as soon as you hit the power button the system is yet to post, until it does nothing is controlling the fans
Unless having actually good fan controller like Aquaero or Quadro...
Those "boot/POST" themselves lot faster than PC and even whole "start up boost" for fans is selectable and controllable in level and duration.