"Harry.Krause" said:
I've installed the ASUS monitoring software off the CD for my new P5WD2
motherboard, but I have no idea what the temperature operating range
should be for my CPU.
I have a P$ 775, 3.4 MHz, with HT. Not the pocket rocket chip.
What should be the "threshold" upper temp range for this CPU? Is there a
look-up source?
And MBM doesn't have my motherboard listed yet...
Thanks.
Start with processorfinder.intel.com
Either search by the five digit SL code ("SL123") which is
a portion of the part number, or use the pull down menu.
Here is a sample of what you will find.
http://processorfinder.intel.com/scripts/details.asp?sSpec=SL7PZ
There will typically be a documentation link on each processor's
web page:
http://developer.intel.com/design/Pentium4/documentation.htm
On the documentation page, I see this document:
"Intel Pentium 4 Processors 570/571, 560/561, 550/551, 540/541..."
http://developer.intel.com/design/pentium4/datashts/302351.htm
Page 78 of 30235104.pdf shows the thermal profile stops at 67.7C
(which is the listed temp on the SL7PZ sample page above). If you
read the description of thermal management that follows, there
are two temperature limits. Maximum Tc (in this case 67.7 degrees
Celsius) is the temperature at which processor throttling begins.
If you are watching the temperature of the processor, and are
doing something compute intensive, you'll notice the temperature
of the processor stops rising abruptly, and that is the throttling
feature cutting back on the processing rate. You should see a
flat line (as seen on the right), versus a 1-e**-kt exponential
curve if no throttling was featured.
(without throttle (with throttle
- asymtotic temp rise) - flat line at 67.7C)
Temp | * Temp |
| * |
| * | *************** 67.7
| * | *
|***** |***** Idle temp
|_____________________ Time |______________________ Time
CPU | 100% _______________ CPU | 100% ________________
Load | | Load| |
| | | |
|__0%_|________________ Time |__0%_|________________ Time
In addition to the temperature stopping at 67.7C, there is a
second threshold. On some processors, the threshold is at 135C,
and the above Intel document says the threshold would be 67.7+20C
= 87.7C. That is the temperature at which the computer would
shut down without warning, due to overheating. The signal is
called THERMTRIP.
The only way to get to 87.7C or higher temperature, is if the
heat sink is no longer pressing against the top of the processor.
If the heatsink is in place, and the fan is operational, the
thermal throttle feature will limit the max temperature to
67.7C. Thus, if you set your Asus software alarm to some
intermediate point, like 77.7C, that will be telling you
that throttling is no longer enough, and you've either had
a fan failure, or the heatsink fell off.
As for temps, I have no idea why some people have such
bad temperature performance. I've read a number of descriptions
from people, who swear that despite all their best efforts,
they cannot prevent the CPU from hitting its case temperature
limit of 67.7C (or whatever the limit is for their chip). If,
what they are saying is really true, and they have an ideal
installation and ideal cooling, the only remaining explanation,
is there is poor contact between the silicon die inside the
Intel processor packaging and the thermal spreader on the top
of the chip.
HTH,
Paul
