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IDProjectCategoryView StatusLast Update
0000020SpeedFanConfigurationpublic2004-10-21 09:05
ReporterScott Assigned Toalfredo  
Status resolvedResolutionfixed 
Platformx86OSWindows XP 
Summary0000020: Fan divisor problem with A7N8X-E Deluxe / Asus ASB100
DescriptionWith the A7N8X-E Deluxe board, the Asus ASB100 / Fan1 / nForce2 SMBus / $2D fan divisor needs to be 4, but is stuck on 2.
Steps To Reproduce1) Use A7N8X-E Deluxe board (perhaps others that use the Asus ASB100; I don't know).

2) Note that SpeedFan 4.13 displays the CPU fan speed (i.e. the fan plugged into the CPU_FAN1 header) at twice the actual value.

3) Go into Advanced options, and select "Asus ASB100 at $2D on nForce2 SMBus" from the drop-down menu.

4) Change the Fan1 divisor to 4, have the setting remembered, and click OK.

5) Note that the CPU speed shown has not changed.
TagsNo tags attached.
Motherboard Model
Video Card Model



2004-06-24 11:28

manager   ~0000068

This is extremely interesting. Nobody ever told me that fan divisors were stuck on 2. This helps me. I hope to be able to fix this issue.


2004-06-25 06:30

reporter   ~0000072

just checked, the fan divisors are remembered in the UI but they're not effective in the calculations.


2004-06-25 11:39

reporter   ~0000074

ran into more "results" while playing with my cooling setup.
I started motherboard monitor, adjusted the "fan type" (not the divisors) and then quit. then I started speedfan, now it reads/calculates the fan speeds correctly. (probably until next restart :) )


2004-08-27 16:01

reporter   ~0000293

I have the same problem:

Fan1 (CPU fan) reports twice the speed; Fan3 (PSU fan) also does.

Tried to change the fan divisors (2 by default) on advanced options "Asus ASB100 at $2D on nForce2 SMBus": using 4 as divisor readings remain the same; using 1 readings are 0 RPMs.

Also tried to change the fan divisors on "Winbond W83791D at $2F on nForce2 SMBus": they can't be modified.


2004-08-30 09:18

manager   ~0000294

DISQ: cold you send me a SEND REPORT before using MBM5, then use MBM5 to change FAN TYPES (which are the available options?) and then send me a final SEND REPORT again?
Please, drop me an email to let me know you just did it.


2004-08-30 23:39

reporter   ~0000297

Last edited: 2004-08-30 23:46

As you asked to DISQ:

-I open SpeedFan; it reports fan speed twice it should be.
-First report sent.
-I open MBM5; it reports fan speed as it should be (~4000rpm).
    CPU fan (FAN1) configuration:
    fan types available: *2, /1, /2 (current), /3, /4... /10
    divisors available: 1, 2, 4 (current), 8, 16... 128
-I select "2" divisor on MBM5 and apply. Neither MBM5 or SpeedFan readings change, but SpeedFan now reports 2 as FAN1 divisor.
-"4" divisor again: No change (just the divisor).
-"8" divisor: No change (just the divisor).
-I go back to 4 divisor, and switch to "/4" fan type: No change on SpeedFan (~8000rpm), MBM5 now reports half speed (0000617:0002000 rpm).
-"/1" fan type: SpeedFan still reports about 8000rpm, now MBM5 also does.
-I finally set "8" divisor and "/2" fan type and send the second report.

    Divisor changes don't work.
    MBM5 reports it ok thanks to "fan type" (witch divides it manually).

From MBM5 help:
"Fan Type

Some Fans will show a too high RPM or a to low RPM as the pulses they send per second don't match what the sensor chip expects.

There are 11 settings, /1 to /10 which divide the readings by that amount and *2 which muliplies the reading by 2. Default setting for 99% of all boards will be /1"

My CPU fan is a TITAN D5TB CU35/SC (

edited on: 08-30-04 23:46


2004-10-21 00:45

manager   ~0000400

I've just added support for manual multipliers and divisors for each fan. This will fully fix your issue with A7N8X. There are 10 (from 1 to 10) available multipliers and 10 (from 1 to 10) available divisors. This way you can use, say, 3/7 or 1/2 or 9/5 :-)
Drop me an email if you would like to try the latest beta. Please, make sure to use an email address where you can receive a 1MB zip file containing an EXE.


2004-10-21 09:05

manager   ~0000401

The fix will be in version 4.18.

Issue History

Date Modified Username Field Change
2004-06-23 10:53 Scott New Issue
2004-06-24 11:28 alfredo Note Added: 0000068
2004-06-24 11:28 alfredo Status assigned => acknowledged
2004-06-25 06:30 disq Note Added: 0000072
2004-06-25 11:39 disq Note Added: 0000074
2004-08-27 16:01 NeoPolus Note Added: 0000293
2004-08-30 09:18 alfredo Note Added: 0000294
2004-08-30 23:39 NeoPolus Note Added: 0000297
2004-08-30 23:46 NeoPolus Note Edited: 0000297
2004-10-21 00:45 alfredo Note Added: 0000400
2004-10-21 09:05 alfredo Note Added: 0000401
2004-10-21 09:05 alfredo Status acknowledged => resolved
2004-10-21 09:05 alfredo Resolution open => fixed