OK, so that system is even simpler. You specify a "Target" temp of the CPU and it will always attempt to get close to that by adjusting fan speed. It will NOT stick to that temp exactly, but will try to stay close. Then you specify a Min fan speed. Every fan will stall if the voltage sent to it is low enough, and then there's an issue of detecting this and re-starting, etc. You do not want that to happen. So YOU can set the minimum Voltage (by setting a min % of full power) it will send out no matter how cool your CPU is. IF you set it too low the fan WILL stall when the system is very cool (especially from a cold start), and then you know to go back in and raise the min.