Needing BIOS to set Optional fan profile is no problem for me since I already use BIOS for the chassis fans. I rid myself of the OS burden of Fan Expert long ago. Fan Expert 2 covers only the CPU, which is mirrored by the CPU_OPT, and chassis fan headers. They total 0.8 amps current, so I can use one header for both fans.Īl the headers are controllable in BIOS. Those fans are PWM, but work fine with the voltage control. I use a water temperature sensor and optional fan header to control my radiator fans. They are also 3/4-pin interchangeable, ie. The three Optional fan headers each respond to the corresponding Optional temperature sensor, rather than to the CPU temperature. That's only a matter of setting the minimum fan speed higher.
This is supposed to work okay for both types, but some have reported control voltage so low that some PWM fans won't start. In this way, they are fully controllable. To get 3/4 pin fan interchangability, the chassis fan header PWM control is held in the ON state and voltage is varied. The three chassis fan headers also respond to the CPU temperature sensor. The CPU and CPU_OPT headers respond to the CPU temperature sensor under the socket. The board detects the difference and uses voltage control on both headers when a 3-pin fan is in the CPU fan header. The CPU Fan header and CPU Optional header are truely PWM when 4-pin fans are plugged in to the CPU header. That only worked on the true PWM header - the CPU fan header. When there are several fans to control together that exceed 1 amp current total, I tried to use a splitter that drew power from a PSU molex and used the MB header only for control and tachometer. This is usually handy, but can cause trouble on at least one instance. They have the feature that either 3 or 4 pin fans can be connected to the fan headers. What you read about the M6E is also true of all the other Asus boards. Here is a good explanation that jab383 wrote, Quote:
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