Inside the Performer s1200, six fans usually do nothing at all, because 90 % of the heat is passively dissipated via massive heat sinks.
Should it nevertheless become really loud for a really long time, the processor-controlled fans remain virtually inaudible at only 19 dB (A).
During power-up, the fans of the Performer s1200 briefly rotate at a higher speed to remove dust of themselves and surrounding components.