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IDProjectCategoryView StatusLast Update
0002034SpeedFanFan controlpublic2012-09-04 10:05
ReporterEdT586 Assigned Toalfredo  
Status assignedResolutionopen 
PlatformWindowsOSXP ProfessionalOS VersionSP3
Product Version4.46 
Summary0002034: PWM2 controls both CPU and chassis fans
DescriptionBIOS Settings
Q-Fan: Enabled
CPU Q-Fan: Enabled
Chassis Q-Fan: Enabled
Mode: PWM
Result: Able to control PWM2 chassis fan only, CPU fan not affected

Q-Fan: Enabled
CPU Q-Fan: Enabled
Chassis Q-Fan: Enabled
Mode: DC
Result: Able to control PWM2 both CPU and chassis fans

All fans are 3 pins
All other PWM settings have no effect
Additional InformationSame results with:
Q-Fan: Disabled
CPU Q-Fan: Disabled
Chassis Q-Fan: Disabled
TagsNo tags attached.
Motherboard ModelAsus P5AD2-E, Asus P5AD2-E Deluxe, Asus P5AD2-E Premium
Video Card Model



2012-09-04 10:05

reporter   ~0007072

I, too, found some unexpected behavior with my ASUS board (M4A79 Deluxe). In my case both Pwm1 and Pwm2 controlled the CPU fan, but in different ways. Pwm2 alone would control the whole range, 0-100%, while Pwm1 alone would only take the fan down to about 28%. I had to play around with both to get what I wanted. Btw, are all 3 of your PWMs set to 'software controlled'?

Changing any one to SmartGuardian seemed to change the behavior of the others, and sometimes would not return control to SmartGuardian without a reboot. I didn't play around with it long enough to detect an overall pattern. It was enough just to get a pattern for what I was trying to accomplish. Although, I have a feeling Pwm2 is more of a global control, perhaps a part of the ASUS thermal protection feature. Or, the odd behavior may have something to do with the 8+2 Phase Power Design. That is not something particularly new so I would suspect SF takes that into account...somehow, tho I would guess it would be tricky.

Issue History

Date Modified Username Field Change
2012-08-19 07:54 EdT586 New Issue
2012-08-19 07:54 EdT586 Status new => assigned
2012-08-19 07:54 EdT586 Assigned To => alfredo
2012-09-04 10:05 MRCS Note Added: 0007072