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post #11 of 17
Thread Starter 
Quote:
Originally Posted by Lozza View Post
My Core temps are quite odd. There are 2 of them in core temp, I assume one for each core. One core is about 6-8C higher than the other in most cases, I don't know why.

Speedfan reports a single core temp however, and a CPU temp, with the core temp being the highest.

I remember a while ago with the old socket-A chips, I had a proper temperature sensor that I stuck of the bottom of the CPU (when there were only 400 or so pins), and ran the cable inbetween the pins. I noticed that reported a temperature about 1-2C lower than the CPU temps, but this was before core temp and other such programs were released. So I think it is safe to say the CPU temperature's are accurate, for the socket-A chips anyway.

I am unsure about the accuracy of the core temps though, we can't exactly stick thermal probes inside the core.
For a dual-core CPU (like your Opteron 165), there would be two core temperature readings (one for each core). It's "normal" (i.e., there have been many many observations) for the two cores to have differing readings, especially at less than maximum load conditions. I've personally observed temperature differences of up to 13 degrees C between cores, with no adverse effects.

However, at full load, the temperature differences between the two cores is substantially reduced. In many cases, they equalize, but not always.

Speedfan, even in its latest versions, only reports one core temperature for S939 AMDs (even dual-cores). The "CPU Temp" is taken from the socket and reports temperatures from the IHS, so it's naturally a little lower.

Thanks so much for your contribution to this thread.

I'm still seeking opinions/comments on the calibration of the core temp sensors, especially from OCNers with far more experience and knowledge than I have. To me, the question of calibration is of prime importance, for this determines the reliability of the data we're seeing from programs that report the temperatures.

Thanks again.
    
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post #12 of 17
My amd x2 4600 reads about 5-8c difference at idle.. Core1 always warmer that core0..

At full load the difference goes as high as 15c.. Running OCCT core0 will be about 40c and core1 skyrockets to 55c+..

This is overclocked from 2.4 to 2.8... I lapped my cpu.. Lapped and installed a TT120.. No diff.. I have tried everything short of taking off the IHS..

After some lengthy research on this i have come to the conclusion that it is a calibration issue with one of my cores.. The reading is not accurate.. Amd even states that those internal diode sensors can be off as much as + or - 15c!

My chip overclocks fairly well so im just gonna live with it
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post #13 of 17
from the AMD tech Docs:

Quote:
TCONTROL max allows the thermal diode to be used to maintain the processor within its case
temperature specification. The accuracy of the temperature sensor, typically ±1 C to 5 C, must be
considered when setting thermal trip points
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post #14 of 17
Thread Starter 
Quote:
Originally Posted by TheSubtleKnife View Post
from the AMD tech Docs:
Dumdum me.

I actually remember (now) having read that tidbit of info a while ago.

Thanks for the refresher.

I guess what this means is that the manufacturer (AMD, in this case) has allowed a margin of sorts with their sensors.

So, within that margin, the reports should be reasonably accurate.

Thanks again!
    
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post #15 of 17
I thought the gap would be smaller between the two cores when both under load also. The problem that I'm having is that there is still quite a large difference. I just ran orthos for 5 minutes or so, and Core 0 = 46 and Core 1 = 54. I don't understand why there is an 8C difference. Might be a dodgy heatsink install maybe.
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post #16 of 17
Plenty of people have that. It just happens.

Now, I'm at 2.55ghz, with 85F ambients which is about 30C, and my processor is loading at 45 from the socket, 26 from the Diode, and 52 from CoreTemp...
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post #17 of 17
my temperature gap under load is usually 5-11C difference between the cores
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