24V DC Cooling Fan why not "smart"?

"24V DC Cooling Fan" why not "smart"? As the saying goes, "a good horse with a good saddle," and vice versa. To resolve the failure, you need to open (usually in the BIOS PC Health option), and then turn on the intelligent control of the initial temperature increase, such as the lower limit can be set to 40 degrees ("24V DC Cooling in the BIOS" SMART Fan "option Fan "began to accelerate), the upper limit of 50 degrees (fan full speed), after saving restart. As to mute, it must sacrifice some cooling performance. Based on Intel PWM (Pulse Width Modulation) technology, it is a 4-pin Smart Fan, and the regulator AMD platform "24V DC Cooling Fan" is a 3-pin. Especially in the current mainstream system ghost xp or win7 ghost require smart fan to give the hardware a good working environment.