Originally Posted by barkeater
Originally Posted by hpmoon
This has evolved into a huge frustration for me! I invested in three new premium 4-pin fans with PWM control capability, and plugged them into the 4-pin PWM headers on the UD5H motherboard. Firstly, they spin at full speed no matter what the BIOS setting (standard, silent, custom at all values). Secondly, EasyTune6 only slightly adjusts the SYS fan speeds down, even with the most extreme plots on its graph -- and the application crashes on its own (Windows 7 64-bit) consistently within an hour or so of doing nothing. Thirdly, HWMonitor Pro and SpeedFan simply do not
control PWM fan speed, period, even though they are advertised to be capable of it. Fourth, and worst of all: there is not a single fan controller on the market that controls PWM fans with 4-pin connectors
. No joke!
The fact that there is no demand for these minimum requirements, from a fan controller to a firmware fix, suggests that hardly any consumers spend the time to figure these things out (far from rocket science)!
I had used speedfan on my now retired computer for a few years to control the speed of the cpu fan.
Based on hpmoon's post I downloaded the most recent version of speedfan to see if I could get it to control SYSFAN_1 as this is the only fan header that I have a fan connected that can be controlled. As reported earlier, this fan header can be voltage controlled as well as pwm. As I have a 3-pin fan connected to it I confirmed that ET6 was able to control this fan's speed. Then I used speedfan to successfully control same fan. Although I can't confirm as I don't have a 4-pin fan, I believe speedfan can separately control three sets of fans. One via cpu fan header, one through SYSFAN_1 fan header, and one through SYSFAN_2 and 3 fan header. Again, as already reported, cpu fan header and SYSFAN_1 fan header can control either by voltage or pwm. SYSFAN_2 and 3 can only be controlled via pwm. SYSFAN_4 cannot be controlled through the motherboard.
I admit ET6 is not very useful when it comes to controlling the system fans as it can only adjust the fans based on the system temp which does not vary much. And it seems to crash often.
Originally Posted by mandrix
Yeah, I don't know what they were thinking with the fan headers, especially header 4 full on voltage all the time. Maybe that's one of the things that finally pushed me into water cooling.
Interesting. Could it be (as you note) that SpeedFan is designed soley for 3-pin, non-PWM fan speed control (even though it mentions PWM), and that's why you could achieve discrete control of each system fan header connected to 3-pin, non-PWM fans? As I mentioned, all my system fans are 4-pin PWM and SpeedFan appears to have no control over them, starting from those boxes with up and down arrows that are 100% by default (without automatic control checked).
I also note in mandrix's comment that the fourth system fan header has no speed control as a matter of hardware, if I'm reading correctly.
In sum: could it be that writing software to control PWM fan speeds is a motherboard-specific task and simply doesn't offer much support because of that? As I also mentioned, HWMonitor Pro+ similarly gives no PWM fan speed control, despite advertising itself as such.