I updated firmware for the workstation board W2600CR one hour ago. (successfully )
Before updating FW I disconnected two chassis fans, since they are very loud. And this situation is detected and updates to FRU/SDR repo.
After reboot the fan of the power supply FXX1200PCRPS become full speed!!! Even louder than with two chassis fans!!! OMG!!!
So I stop working immediately since it is midnight at my timezone.
My best guess is that decreasing the number of the fans in the whole system will boost the speed of remaining fan(s). Need to fix that at day time. Or it is impossible to live with us.
For your reference.