A8N-E mosfet temperature

  • Thread starter Thread starter Nanga Parbat
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Nanga Parbat

The A8N-E has a temp sensor (ITE8712F-3) located at the mosfets.This
sensor is displayed by MBM5. At idle it reads about 24°C, 2 degrees
above ambient. If Prime95 is started it raises to 40° almost instantly
and climbes further to nearly 60°. It fact, it runs hotter than the
CPU. As quick as this temp goes up, it drops back when Prime95 is
stopped.

I've never seen temps of mosfets before so I don't know what's normal
for these components. The reason I ask is that I can't run Prime95 for
over an hour without getting an error. And I haven't started oc'ing
yet.

Nanga
 
Nanga said:
The A8N-E has a temp sensor (ITE8712F-3) located at the mosfets.This
sensor is displayed by MBM5. At idle it reads about 24°C, 2 degrees
above ambient. If Prime95 is started it raises to 40° almost instantly
and climbes further to nearly 60°. It fact, it runs hotter than the
CPU. As quick as this temp goes up, it drops back when Prime95 is
stopped.

I've never seen temps of mosfets before so I don't know what's normal
for these components. The reason I ask is that I can't run Prime95 for
over an hour without getting an error. And I haven't started oc'ing
yet.

Nanga
Click to expand...

60 degrees is nothing for MOSFETs, simple semiconductors like that can
take a lot more heat than a CPU.

Are you sure that's actually where the sensor is located?
 
60 degrees is nothing for MOSFETs, simple semiconductors like that can
take a lot more heat than a CPU.

Are you sure that's actually where the sensor is located?
Click to expand...

Not really. MBM5 doens't support A8N yet. I've downloaded a modified
version of MBM5 and that one has a label "mosfets" for that sensor.

According to that modified version ITE8712F-1 is the CPU, ITE8712F-2
the chipset and ITE8712F-3 the mosfets. The temps I see for the CPU
and chipset make sense to me but the 3rd one... I'm not sure.

Nanga
 
Not really. MBM5 doens't support A8N yet. I've downloaded a modified
version of MBM5 and that one has a label "mosfets" for that sensor.
Click to expand...

It never will support the A8N because the author has stopped
development of MBM5. I believe that what you're downloading is simply
the latest version of MBM5 with a modified voltage.ini file, and
whoever modified it is free to label the different sensors in the A8N
section any way he wants. Are you perhaps saying that the ITE8712F-3
chip is by the MOSFETs? If so, that doesn't mean that it's sensing
MOSFET temps. On my A8N-SLI Premium, I'm using a modified voltage.ini
file, that does NOT say anything about the MOSFETS. I also see NO
temperatures that EVER go above about 41°. Many users have speculated
that the three sensors connected to the ITE8712F-3 on the A8N series
of boards are at the chipset, the CPU, and a location on the board
away from heat-producing devices so that it gives an approximation of
case temperature.
According to that modified version ITE8712F-1 is the CPU, ITE8712F-2
the chipset and ITE8712F-3 the mosfets. The temps I see for the CPU
and chipset make sense to me but the 3rd one... I'm not sure.
Click to expand...

Yeah, it doesn't make any sense. I can't believe that different
boards within the A8N series have these sensors located in different
places, and I've never read a report of ANY A8N owner who's under the
impression that MBM5 (or ANY monitoring software) is measuring the
temperature of the MOSFETs.

Ron
 
Yeah, it doesn't make any sense. I can't believe that different
boards within the A8N series have these sensors located in different
places, and I've never read a report of ANY A8N owner who's under the
impression that MBM5 (or ANY monitoring software) is measuring the
temperature of the MOSFETs.
Click to expand...

Om my A8N-SLI Premium I have 2 analog temperature senors attached to
each end of the heatsink which cools the voltage regulators and the
heatpipe (Chipset cooler) these sensors are monitored by mCubed
Tbalancer. They are currently showing 38C and 45C.

MBM is showing:

Case 23C
MotherBoard? 33C
CPU 30C.

Note that the Tbalancer readings may be a little off because the
analog sensor linearisation is not 'perfect'.
Peter Finney
Liphook
Hampshire
England
 
milleron said:
Yeah, it doesn't make any sense. I can't believe that different
boards within the A8N series have these sensors located in different
places, and I've never read a report of ANY A8N owner who's under the
impression that MBM5 (or ANY monitoring software) is measuring the
temperature of the MOSFETs.
Click to expand...

Here's my MBM5 Data directory
http://users.telenet.be/vp/np/Data/

At idle is shows for:
- ITE8712F-1: 28°C
- ITE8712F-2: 30°C
- ITE8712F-3: 29°C

(These temps differ from my first post since I've gone up from 1.35 to
1.5Vcore)

When I run 2 (AMD X2) instances op Prime95:

- ITE8712F-1 goes quickly to about 42° and eventually to 55* after 2
hours of Prime. That looks like a CPU to me as the label says.

- ITE8712F-2 rises slowly from 30° to 38° after 2 hours of full load.
It's label is "chipset" and these temp are what I expect from the
chipset.

- ITE8712F-3 goes up much faster than ITE8712F-1 when running Prime to
reach about 55° after 10 minutes and then stays there. When Prime is
stopped it drops back to it's idle temp very fast, much faster than
ITE8712F-1 drops. I don't know where this sensor is located or what it
measures only that it has a label "mosfets". If this sensor is
supposed to give a approximation of my case temp, I have a problem :)

Nanga
 
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