This just in from Techseekers.net.

A very interesting feature is the inbuilt FAN speed control system thats included in the BIOS and also available as a software program. Depending on the system temperature and CPU temperature the SilentTEK system alters FAN rotational speed right down to off if the system is cool enough. It's like having a little software FANBUS system. Of course these fans have to be driven from the motherboard headers and not powered by the PSU connectors.