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CHAFAN on mobo question (fan rpm)

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Nov 13, 2001
San Fernando Valley,Southern California
I have a Dragon+ and

I cannot get CHAFAN2 & CHAFAN3 to read fan speed in "MBM5" or "Sandra",I have tried several different fans plugged into the fan pins on the mobo,I have tried just the yellow wire(which is the way I have it now)I like to run the power and ground directly through the psu,

has anyone else run across this problem?

I have a fan hooked up to CHAFAN1,and it reads the rpm's just fine.

or does anyone know of other monitoring apps that work good?

(smartguardian,only has fan speed for CHAFAN1)
Last edited:


Oct 30, 2001
I have the same problem and have tried to get fan 2 and 3 to monitor but no luck and also cpu fan 2 to work. All I can think of is the motherboard isnt capable of it.


Jan 4, 2002
Raleigh, NC--NCSU
When I had my ThermoEngine (*stupid piece of......****), it was connected to CPU1. My little soyo northbridge fan was connected to CHAFAN2. In SmartGuardian, it would read both! Although, the CHA was going back and forth from 1700RPM or something to O RPM, and vice versa. But, as soon as I went to my current bong setup and took off the ThermoEngine, it hasn't read the CHA fan yet.
My $.02