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IDProjectCategoryView StatusDate SubmittedLast Update
0001784SpeedFanFan controlpublic2011-04-11 02:432018-12-25 10:17
Assigned Toalfredo 
PlatformBiostar a785g3OSWindows 7OS Version
Product Version4.43 
Target VersionFixed in Version 
Summary0001784: No case fan speed control
DescriptionSpeedfan Ver 4.44 Beta.

Sent Debug via Speedfan.

There is one 4 pin fan (for CPU) and one 3-pin sys fan. Speedfan controls the CPU fan fine. Speedfan is unable to control the sys fan.

I notice under the speed tab all speeds are listed as PWM, despite the fact that the Sys fan is a 3-pin fan which I understand to be voltage regulated.

For the IT8718F:
Fan 1 = CPU Fan
Fan 2 = Sys Fan
Fan 3-5 = Always 0, unknown.
Temp 1-3 = I believe are individual core temps.
Core = CPU temp (which is disabled when ACC is on)
Speed04 = CPU Fan

For the SB7xx/8xx PM2:
Fan 1: Avg 12 RPM, very wierd, I don't know what fan this is
Fan 2: Avg 2k rpm, I don't know what fan this is
Fan 3: always 0, unknown

TagsNo tags attached.
Motherboard ModelBiostar A785G3
Video Card Model
Attached Files

- Relationships

-  Notes
norman02us (reporter)
2011-04-11 09:24
edited on: 2011-04-11 09:24

Changing the fan speed for the sys_fan is probably not possible on this motherboard. The motherboard's manual shows that the BIOS doesn't offer sys_fan control. The lack of BIOS control is a strong indicator that the necessary hardware parts for controlling the fan are missing on the motherboard.

alfredo (manager)
2011-04-11 09:55

I agree with norman02us.
Consider that a 3-pin fan can be controlled both using PWM and voltage. PWM is a way to simulate voltage changes.
bryanwieg (reporter)
2011-04-11 15:45
edited on: 2011-04-11 16:29

Are you saying that a PWM 3-pin fan may be successfully controllable?

.. Or are you saying the by default 3-pin fans are controllable by PWM and voltage changes?

dpallen77 (reporter)
2012-01-18 09:04

Was this ever resolved? I have a TA770XE mobo and can see the system fans running, but do not get speed options for them.
norman02us (reporter)
2012-01-20 21:41

As stated above, there is nothing to solve here.

Take a look at the motherboards manual (or BIOS). If the BIOS doesn't show the speed or the control option for a fan, then the necessary hardware on the motherboard is probably missing.

If the hardware is not there, Speedfan can't do anything.
garix1234 (reporter)
2018-12-25 10:17

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- Issue History
Date Modified Username Field Change
2011-04-11 02:43 bryanwieg New Issue
2011-04-11 02:43 bryanwieg Status new => assigned
2011-04-11 02:43 bryanwieg Assigned To => alfredo
2011-04-11 09:24 norman02us Note Added: 0006102
2011-04-11 09:24 norman02us Note Edited: 0006102 View Revisions
2011-04-11 09:55 alfredo Note Added: 0006104
2011-04-11 09:55 alfredo Status assigned => acknowledged
2011-04-11 15:45 bryanwieg Note Added: 0006108
2011-04-11 16:29 bryanwieg Note Edited: 0006108 View Revisions
2012-01-18 09:04 dpallen77 Note Added: 0006799
2012-01-20 21:41 norman02us Note Added: 0006803
2018-12-25 10:17 garix1234 Note Added: 0008718

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