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.
It is noisier than you can imagine. I used an Android sound level app and it shows 65db at about 1 foot away. As Dan_O stated, I don't believe the PWM offset controls the PSU fan speed at all. I already own a system with the PSU, and the route I'm currently taking is to build a quite/soundproof cabinet to hold the machine in my basement. But another feature of the PSU is that once the fans start up, they don't seem to ever slow down. So once the horrendous noise starts, you have to reboot to quiet it down
In order to reduce the noise on system fans or power supply fans, we recommend updating the firmware to the latest version available and making sure to update the sensors for the system at the end of the update procedure (SDR option#1). Under regular circumstances, that troubleshooting will address the issue. We can also confirm is not directly related to the power supply itself.