[Anand] Intel Core Temperature Explained - Overclock.net

DuckieHo · 03-06-08

http://www.anandtech.com/cpuchipsets...spx?i=3251&p=4

Quote:

More than a few programs have been released over the last few years, each claiming to accurately report these DTS values in real-time. The truth is that none can be fully trusted as the Tjunction values utilized in these transformations may not always be correct. Moreover, Intel representatives have informed us that these as-of-yet unpublished Tjunction values may actually vary from model to model - sometimes even between different steppings - and that the temperature response curves may not be entirely accurate across the whole reporting range. Since all of today's monitoring programs have come to incorrectly assume that Tjunction values are a function of the processor family/stepping only, we have no choice but to call everything we thought we had come to know into question. Until Intel decides to publish these values on a per-model basis, the best these DTS readings can do for us is give a relative indication of each core's remaining thermal margin, whatever that may be.

Good read on how Intel CPU temperatures are determined... and why they are almost all wrong. The rest of the article is interesting as well.

brome09 · 03-06-08

Great info, thanks.

**TaiDinh** · 03-06-08

Now that makes me wonder if the 100TJ for G0 stepping is accurate or not. It's a bit scary not knowing now if your temperatures that you thought or were said to be accurate is accurate or not now.

MasterKromm · 03-06-08

I already know all about Core Temps, thanks to this guide over @ Tom's:

http://www.tomshardware.com/forum/22...perature-guide

I wonder if the guys over @ Anandtech "borrowed" any of the info from there?

Still, I found "the truth about processor degradation" pertinent, as newbs can only quantify such things by use of graphs and charts (aka pics).

/end sarcasm

Flower · 03-06-08

Which program do you guys trust the most?

**TaiDinh** · 03-06-08

Quote:

Originally Posted by Flower

Which program do you guys trust the most?

I trust CoreTemp the most when it detects the accurate TJ.

xlastshotx · 03-06-08

hmm interesting, nice find.

Gollie · 03-06-08

Good read

DuckieHo · 03-06-08

Quote:

Originally Posted by TaiDinh

Now that makes me wonder if the 100TJ for G0 stepping is accurate or not. It's a bit scary not knowing now if your temperatures that you thought or were said to be accurate is accurate or not now.

It's not accurate. The article already said the TJ values aren't published for desktop CPUs.

Quote:

Originally Posted by TaiDinh

I trust CoreTemp the most when it detects the accurate TJ.

It's still a guesstimate. Intel even said that it was wrong (in a Maximum PC article).

Flower · 03-06-08

I am a bit gutted about the whole Tj thing. I don't know what to use and I may have been running my chip in the 70°C range if the 100°C Tj max for M0 (coretemp 0.96.0) is anything to go by.
I get 66°C Orthos load and around 60 when folding with 0.96.0, and thats on stock volts, I doubt my cooler is that bad a performer.

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[Anand] Intel Core Temperature Explained

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