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IDProjectCategoryView StatusLast Update
0001866SpeedFanOtherpublic2011-09-02 16:58
Reporterstreetwolf Assigned Toalfredo  
Status acknowledgedResolutionopen 
Platformx64OSWindowsOS Version7
Product Version4.45 beta 
Summary0001866: Case fan displays as 0 RPM
DescriptionUsing Fan Control my case fan RPMs always shows zero when I am doing very little work. When I do more intensive work the RPMs will start to display. It will display as Zero again once the workload decreases.

The fan is still spinning when it displays zero RPMs and appears to ramp up and down according to the fan control profile I use.
Steps To ReproduceNot needed.
Additional InformationSent you a report.
TagsNo tags attached.
Motherboard ModelASUS Rampage II GENE
Video Card ModelASUS AMD HD6970



2011-09-02 14:47

manager   ~0006446

This seems to the best way of reporting: I just found the SEND REPORT referencing this issue :-)
Please, enter CONFIGURE / OPTIONS and set FAN3 DIVISOR from 2 to 8 or 16.


2011-09-02 16:11

reporter   ~0006447

I assume you meant CONFIGURE / ADVANCED :-)

Tried both 8 and 16 with no change in the RPMs.

If I recall correctly I never was able to display my Case fan on the main screen until you implemented ATK0110 support.

I changed the FAN3 Div under my Winbond chip section. There are also two fans (FAN1 & FAN2) under the ATK0110 chip section which I also changed to no avail.


2011-09-02 16:53

reporter   ~0006448

I did some further testing. When I set my case fan graph in Fan Control so that it runs at about 50% I start seeing RPMs. If I set it lower that's when it displays zero RPMs. So as my CPU temp rises and the case fan speed reaches about 50% I then see RPMs.

Is this a bug in Fan Control? Reporting speeds under 50% or so as RPM zero?


2011-09-02 16:58

manager   ~0006449

You were right, I meant "advanced". Please, notice that FAN DIV is not the same as FAN DIVISOR. W83667HG has got FAN DIVISORs. ATK0110 has none.
Are you using 3-wire or 4-wire fans? PWM can influence fan speed reporting. Have a look at and .

Issue History

Date Modified Username Field Change
2011-09-02 14:38 streetwolf New Issue
2011-09-02 14:38 streetwolf Status new => assigned
2011-09-02 14:38 streetwolf Assigned To => alfredo
2011-09-02 14:47 alfredo Note Added: 0006446
2011-09-02 14:47 alfredo Status assigned => acknowledged
2011-09-02 16:11 streetwolf Note Added: 0006447
2011-09-02 16:53 streetwolf Note Added: 0006448
2011-09-02 16:58 alfredo Note Added: 0006449