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IDProjectCategoryView StatusLast Update
0001830SpeedFanFan controlpublic2011-07-03 10:06
Reporterfastleo63 Assigned Toalfredo  
Status resolvedResolutionno change required 
PlatformAMDOSWindows 7 64-bitOS VersionSP1
Product Version4.44 beta 
Summary0001830: CPU fan speed unajustable - Instead, I can control chassis fan speed
DescriptionAs in summary.

Brand new ASUSTek Sabertooth 990FX mainboard.
Chipset AMD 990FX/SB950.
BIOS 0402.
SuperIO chip IT8721F.
Steps To ReproduceNo specific steps.
TagsNo tags attached.
Motherboard ModelASUS Sabertooth 990FX
Video Card Model



2011-06-26 15:48

manager   ~0006276

Did you enter CONFIGURE / ADVANCED and change PWM MODE? It's in the help file, if you need further reference.


2011-06-27 11:14

reporter   ~0006278

Yes, I entered advanced section and changed PWM mode, I tried reverse PWM, too.
The problem is present only on CPU_FAN and CPU_OPT headers (4-pin).
I have two other fans, connected to CHA_FAN1 and CHA_FAN2 headers (4-pin, too), and I can control their speeds. I didn't tried the other connectors, CHA_FAN3 (4-pin) and CHA_FAN4 (3-pin).
All four fans are from Noctua, and worked very well with SpeedFan on my previous board (ASUS M3A78-T).


2011-06-27 11:19

reporter   ~0006279

Last edited: 2011-06-27 11:20

Maybe I can try a possible workaround of the problem, connecting the CPU fans to CHA_FAN3 and/or CHA_FAN4 headers, but I think I'll get a BIOS low CPU fan speed warning...


2011-06-28 09:59

manager   ~0006285

I assume you are using the correct type of fan (4-pin, I guess) on that header. Right?
Can the BIOS control that fan speed? I mean: are you sure that it can be controlled?


2011-06-28 15:03

reporter   ~0006291

Last edited: 2011-06-29 14:35

My fans are 3-pin types.
I can confirm that current mainboard BIOS (initial release - v0402) cannot control fan speeds if connected via 3-pin to the CPU_FAN and CPU_OPT 4-pin headers, but it's able to manage the chassis headers.
The strange thing is that the same fans worked without problems with my previous board (ASUS M3A78-T) that had the same CPU fan header type (4-pin).
Maybe the M3A78-T was able to manage CPU fan header either in voltage control mode and PWM mode...
By the way, the Sabertooth 990FX features a lot of temperature sensors, located in different sections of the board. Seems that the only way to read them (with the exclusion of Core and CPU) is to install the ASUS AiSuite II tool, but I can't get it to work... At startup I always get an APPCRASH. A lot of users reported several install/run issues related to the suite...


2011-07-03 10:06

manager   ~0006305

If you use a 4-wire fan this issue will be gone.
Feel free to open a new one about the temperature readings. When you have opened it, use the UPLOAD FILE to upload DEBUG.NFO file from SpeedFan's directory and the output of a SEND REPORT (INFO tab).

Issue History

Date Modified Username Field Change
2011-06-26 15:36 fastleo63 New Issue
2011-06-26 15:36 fastleo63 Status new => assigned
2011-06-26 15:36 fastleo63 Assigned To => alfredo
2011-06-26 15:48 alfredo Note Added: 0006276
2011-06-26 15:48 alfredo Status assigned => acknowledged
2011-06-26 15:48 alfredo Product Version 4.43 beta => 4.44 beta
2011-06-27 11:14 fastleo63 Note Added: 0006278
2011-06-27 11:19 fastleo63 Note Added: 0006279
2011-06-27 11:20 fastleo63 Note Edited: 0006279
2011-06-28 09:59 alfredo Note Added: 0006285
2011-06-28 15:03 fastleo63 Note Added: 0006291
2011-06-28 15:39 fastleo63 Note Edited: 0006291
2011-06-28 15:39 fastleo63 Note Edited: 0006291
2011-06-28 15:41 fastleo63 Note Edited: 0006291
2011-06-29 14:35 fastleo63 Note Edited: 0006291
2011-07-03 10:06 alfredo Note Added: 0006305
2011-07-03 10:06 alfredo Severity major => minor
2011-07-03 10:06 alfredo Status acknowledged => resolved
2011-07-03 10:06 alfredo Resolution open => no change required