Core 2 temperatures

  • Thread starter Thread starter GT
  • Start date Start date
G

GT

Speedfan readings... Why would 1 core report a steady 50 degrees, while the
other core reports just 46. They are fairly idle at the moment, but temp
doesn't tend to rise much when busy. Seems like a big difference for 2 cores
that are so close physically.
 
Darklight said:
What cpu are you talking about
my cpu an amd x2 64 bit 6400+ goes like this
temp 1 33 degrees
temp 2 18 degrees

thats running at 1000MHz. under load both go to about 50 +-5 degrees
Click to expand...

Sorry, should have been more specific. I said core 2 in the subject, but
never mentioned that its a 2.13GHz e6400 core 2!
 
kony said:
Probably some OS thread is running on one, keeping it barely
busy while the other is practically always idle, or maybe
the heatsink base or CPU heat spreader isn't perfectly flat.
Click to expand...

I did wonder about system threads and have been watching task manager, but
the only processes running are taskmanager itself and speedfan. perhaps the
speedfan monitoring software causes the core0 to tick over. This it the
nature of chaos - by simply observing the CPU, I am affecting its
temperature and operation!

The room was pretty warm yesterday but today the room is cold and the cores
read 40 and 36, so still a 4 degree difference. Even in a warm room, 50
degrees is not bad for silent air cooled system, so I won't worry about it.
Next time I'm in there, I'll perhaps reseat the cooler. I'm sure I have some
thermal paste kicking around from my last job.
 
Also, the internal thermal path for each core will differ if the layout on the
die is not perfectly symmetrical or if activity (and thus heating) is not
absolutely evenly distributed over the rest of the die.
I did wonder about system threads and have been watching task manager, but
the only processes running are taskmanager itself and speedfan. perhaps the
speedfan monitoring software causes the core0 to tick over. This it the
nature of chaos - by simply observing the CPU, I am affecting its
temperature and operation!
Click to expand...

System processes have many threads.
Each can run at different times and different loadings - and usually on just
one of the cores.
At idle, those threads make up a lot of the activity.
The room was pretty warm yesterday but today the room is cold and the cores
read 40 and 36, so still a 4 degree difference. Even in a warm room, 50
degrees is not bad for silent air cooled system, so I won't worry about it.
Next time I'm in there, I'll perhaps reseat the cooler. I'm sure I have some
thermal paste kicking around from my last job.
Click to expand...

Although your core sensors were intended to be identical, they can still have
minor differences that cause them to read differently.
Despite every effort, the die fabrication process is not perfect; in fact,
according to NewEgg customer comments, at least one very modern quad core is
arriving with some totally broken core temperature sensors.

So, I certainly wouldn't worry about any *small* differences between cores...
 
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