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TAT vs. speedfan inconsistencies between cores

post #1 of 23
Thread Starter 
If I run both TAT and speedfan, the Intelcore temps are different. Yeah, yeah, I know, I read the thread that explains they should be 15 °C off. On my system, I can calculate an average difference which differs for each core. Not only that, but the difference changes if the machine is in an idle state vs. a load state.

What I did was simply run 2x orthos, then log the temps in both speedfan and TAT (you can write a log in TAT after the time period is up). After I parsed out the non-temp data from the logs, I simply averaged the numbers per core. If I subtract the TAT temps from the speedfan temps, I get the average differences, which as I said are both different per core, and different for an idle vs. load state.

For my setup (P5B-Del and Q6600 @ 9x333) I get the following:

[img]http://img513.imageshack.us/img513/4049/***ll3.gif[/img]

Anyone else willing to try this experiment? If you don't want to or know how to do the averaging in a spreadsheet, you can email your logs to me and I'll do it for you.
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post #2 of 23
I can tell you that TAT and SpeedFan on my computer have a difference, but not by that much.

TAT is always a C or two higher than SpeedFan, except on core1, which is always 4-6C higher than Core0 in TAT, but in speedfan it's the same as core0.
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post #3 of 23
Thread Starter 
Did you apply any offsets to speedfan or is that out-of-the-box?
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post #4 of 23
Quote:
Originally Posted by graysky View Post
Did you apply any offsets to speedfan or is that out-of-the-box?
For SpeedFan to be similar to TAT, you'll have to adjust some settings, but I don't know them.

TAT is the most accurate program that I would trust for the C2D(s).
Have you tried CoreTemp? CoreTemp and TAT and are around 1 ~ 2C difference.
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post #5 of 23
Thread Starter 
coretemp crashes my system everytime I load the app. I read somewhere that TAT was designed for Memrom cores and isn't calibrated by Conroe cores. I dunno which end is up anymore.
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post #6 of 23
Quote:
Originally Posted by graysky View Post
Did you apply any offsets to speedfan or is that out-of-the-box?
Just out of the box. The only "modding" I did in SpeedFan was adding in an event setting (75C+ on core0 or core1 = system shutdown, very useful in the event of a pump failure).
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post #7 of 23
Thread Starter 
I figured out what my problem was. TAT sucks for reading temps on C2D chips. I should have taken a hint from the application itself. If you launch it and look in the upper left under Processor Details, you'll see, "Processor: Pentium M." I just ran RMClock and Speedfan and had both apps log a set of load temps. Then I meticulously analyzed the log files and averaged the exactly (down to the last second) the same time points from each log to ensure a fair comparison. If I take the difference of the average RMClock core temp numbers and the average Speedfan numbers, I arrived at:

Code:
Core 0: 15.002
Core 1: 15.069
Core 2: 15.049
Core 3: 14.979
Conclusion: Speedfan can log temps as precisely as RMClock can and the offset is indeed -15 °C. Also, don't use TAT for a C2D or Quad C2D!
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post #8 of 23
I believe TAT says Pentium M for everyone.
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post #9 of 23
Quote:
Originally Posted by graysky View Post
Conclusion: Speedfan can log temps as precisely as RMClock can and the offset is indeed -15 °C. Also, don't use TAT for a C2D or Quad C2D!
so how is it that TAT is incorrect then? From what you said speedfan is accurate at logging, and has a -15c from the true temp...

Did TAT not log as well as speedfan then? Or did it just not log as fast as speedfan..


TAT says Pent M b/c that what it was made for...Pentium M's..but that doesn't mean it won't run other cpu's.
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post #10 of 23
now, I don't profess to be an expert, and I'm going on on a limb here, but I think speedfan is bollocks!

I can't even see why I downloaded it. It told me my chip was cooler than my ambient - something I find very difficult to believe. However, TAT and Coretemp seem to be within 1 or 2 degress of each other, and give much more realistic readings.

moral of the story - trust TAT, not speedfan

Sam
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