Re: Utility to obtain CPU temperature

The message <fsrav0$uki$1@xxxxxxxxxxxxxxxxxx>
from ProfGene <mfevs@xxxxxxxxx> contains these words:

Owner wrote:
"catchme" <someone@xxxxxxxxxxxxx> wrote in message
news:evfuj.52358$Ly.50040@xxxxxxxxxxxx
Lew wrote:
"catchme" <someone@xxxxxxxxxxxxx> wrote in message
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...i recommend a
motherboard that supports AMD.

LOL .. Right now Intel blows AMD out of the water.
intel always beats amd from pure clock speed,


but amd are far more stable.

For overclocking maybe, but not as a stock processor right out of the box.


many mac die hards are left wondering why apple chose intel, despite
rumours that intel has more resources to deliver processors on
time, and a
larger r&d budget- also something to do with lower voltages...but amd is
still the acknowledged superior (though costlier) processor.


I have one case that came with a heat sensing wire that you attach
directly to the heat sink and it displays a number on the front of the
case but a technician where I bought it says it is not that accurate.

He's quite right too! The most accurate sensor is the diode sensor
integrated into the chip itself, followed by a bead thermistor
contacting the underside of the CPU, followed by a thermistor contacting
the heatsink.

The heatsink temperature measurement is two degrees (of magnitude - not
deg C! :-) removed from reality because you're measuring the cooled side
of the processor via a surface that will be a few degrees cooler again
than that.

Measuring the underside of the cpu, is measuring a surface temperature
which doesn't demonstrate the same thermal gradient as the heat spreader
side (perhaps as little as only 5 degrees cooler than the chip instead
of the more probable 20 or more degrees on the heat spreader side).

Some MoBo bioses report the actual chip diode sensor readings, others
apply a Tcase equivilent adjustment to this reading (typically
subtracting 25 deg C off the actual chip temperature). You can often
tell which case is which by the fact that the upper max temp overheat
trip point is either shown as 95 deg C or else shown as 70 deg C with
the lower max temp limit implying the use of a Tcase equivilent temp
rather than the more accurate chip reading temp.

Annoyingly, with some bioses, no such overheat threshold setting is
available and you're left to guess which type of reading is in force
since, ime, the MoBo manufacturers never state which type of
'measurement' is being employed.

HTH

--
Regards, John.

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