Question about Temperatures on E6600

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bullen

Weaksauce
Joined
Jan 17, 2007
Messages
99
Hi i've got a question, when im running my Core2duo Overclocked and run orthos, speedfan shows that cpu temp goes all the way upp to 7-8* Celcius (using Vapochill LS), but the question is. Can this temp be trusted? Becouse the core 0 and 1 temp stands at 5* no matter what, idle and load. and it doesn't matter if i turn PECI on or off.

the thing is that if i stop orthos the cpu temp will drop to -20 in the matter of 1 second this makes me wonder if that temp is trustworthy, what do you guys think? oh btw, does the p5b have a thermal diode that measures the cpu temp or is it the cpu?. i've got the impression that the internal diodes are core 0 and 1?

so can anyboby help me to clear things up?
im sorry if the writing is bad, english aint my native tounge.
thx :)
 
Use CoreTemp 0.95 and believe what it tells you for the core temperatures. It is reading directly from the on cpu digital sensors and is the most accurate temperature number to go by. Various other diode based temperature readings and sensors often times have a large amount of error in them.

The second you start or stop running Orthos, the temperature will change immediately and often times by a large amount. With a Tuniq air cooler I can see a 25C drop in one second. Both cores at full load compared to no load makes a big difference.

If it makes you feel better, my P5B can report a CPU temperature of 12C at idle in a 22C room which is of course impossible with an air cooler. That's why I only trust the reported core temperatures.
 
Is the Tjunction where the processors meet? (mine's at 85C for a e6600, stock cooled)
 
Tjunction is pretty much an 'automatic forced shutdown to prevent chip failure' temperature. You do not want to get anywhere near that temperature. Anything above 60C load on a C2D is potentially dangerous. Intel has stated 65C as maximum operating temperature.
 
silent-circuit said:
Tjunction is pretty much an 'automatic forced shutdown to prevent chip failure' temperature. You do not want to get anywhere near that temperature. Anything above 60C load on a C2D is potentially dangerous. Intel has stated 65C as maximum operating temperature.
Click to expand...

What CoreTemp refers to as Tjunction should be called TjMax or the maximum safe junction temperature for the processor. Core based processors can be operated safely right up to TjMax.

The 60C to 65C number that keeps getting brought up is not a core temperature but a case temperature. These two temperature numbers are measured at two different locations, are not the same and shouldn't be compared.

The forced shut down of a core processor doesn't occur until the THERMTRIP# temperature is reached. That is a good 20C beyond TjMax.

The exact THERMTRIP# temperature is not documented for the desktop Core 2 Duo processors but according to Intel, it's approximately 125C for the mobile Core 2 Duo processors:

Intel: Regardless of enabling the automatic or on-demand modes, in the
event of a catastrophic cooling failure, the processor will automatically shut down when
the silicon has reached a temperature of approximately 125 °C. At this point the
THERMTRIP# signal will go active.
Click to expand...

Intel: As an output, PROCHOT# (Processor Hot) will go active when the processor
temperature monitoring sensor detects that one or both cores has reached its
maximum safe operating temperature.
Click to expand...

PROCHOT# doesn't occur until the on chip digital thermal sensors ( DTS ) return zero which doesn't happen until the processor has reached TjMax. Intel refers to that in their documentation as the "maximum safe operating temperature."
 
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