Temp reporting: MBM vs bios

[Nucro]

Doesn't MBM and the bios read the temps from the same chip? One of my friends keep telling me that bios shows the most accurete temp readings? How does this work?
He says that before he did bios update for his Asus P3V4X , the temp. readings of the bios and the program he used (Asus Probe) used to give different readings.
So he says that the motherboard monitoring program was showing the wrong temps because the faulty bios caused the monitoring program to read the temps from another (?) source. But at the same time the bios could read from the actual source and thus show the correct temps.
Can this be true? If this is true than the most accurete readings can only be made by the bios?

 

[Nate420]

I was surfing the forums over at the MBM site the other day looking for an answer as to weather MBM5 was reporting the correct temps. This is specific to Asus boards, but the author of MBM said that:

The CPU sensor settings are as follows....

Sensor2 - reports the temp directly from the on-die sensor.
Sensor CUSL2 - MBM adds compensation(per asus recommendation)to the readings from the on-die sensor.

I think there is only one sensor for cpu temps, weather it's in the socket or in the cpu itself. My Asus P4B266 BIOS temps are totaly screwed, they seem to be locked in place as they never change. I believe MBM to be correct if you set it up according to the author's settings for each board.

 

[f13dfx]

Nate420:

So did you use Asus 2 or Asus 2 CUSL2 sensor for your P4B266?

 

[Nucro]

<< This is specific to Asus boards, but the author of MBM said that:

The CPU sensor settings are as follows....

Sensor2 - reports the temp directly from the on-die sensor.
Sensor CUSL2 - MBM adds compensation(per asus recommendation)to the readings from the on-die sensor.

>>



Can you give a link for this quote? Why should MBM need to add compensation? I couldn't find it on the ( http://mbm.livewiredev.com/comp/asus.htm ) web page.

 

[Nate420]

<< asus 2 gives you what the sensor chip reports, asus 2 culs gives you that + compensation asus thought was needed (on certain boards) >>




Link to the thread.

I'm using the sensor2, not the cusl2.
With the P4's internal sensor, I can't see why you'd need any compensation. And for the acclaimed "cool running" Northwood, the sensor2 readings are much more believable to me.