What exactly is PECL Agent temp as opposed to CPU temp??

Hi,

I have a new PC with an X7DAE mainboard and two Xeon 5355 quad core
processors. I'm getting what look to me like confusing temperature
results.

According to the X7DAE manual the "hardware monitor" BIOS screen has
three different appearances depending on the processor and monitoring
chip, and these make sense.

According to the manual I should get something like:

CPU Temperature Threshold (selectable)
CPU1 Temp / CPU1 Second Core
CPU2 Temp / CPU2 Second Core
PECI Agent 1 Temperature
PECI Agent 2 Temperature
PECI Agent 3 Temperature
PECI Agent 4 Temperature
System Temperature
Fan speed display
etc.

What I get is a cut down list
CPU Temp Threshold (hard set to 75 degC)
(no CPU temps)
PECI Agent 1 Temp (usually 35-40 degC)
PECI Agent 2 Temp (usually 35-40 degC)
System Temperature. (usually about 60 DegC)
Fan Speed display showing decent speeds..

So I don't get a CPU temp at all. The PECI Agent temps look ok to me
but the "System temperature" is very high in comparison (I would have
expected it to be lower than the CPU temp).

I read somewhere that the PECI Agent temp is a more accurate
measurement straight off the CPU core, and this is relatively low yet
the "system temperature" is quite high - wherever that is measured
from.....

Does anyone have a read on what this says about the thermal health of
my system? Can I trust the PECI figures or worry about the "system
temperature"? Or where I can find out more?

MTIA