[NightCrawler™]

I was doing some testing with the program and discovered something really odd and quite frankly it scared the [censored] out of me..

I used the stability testing feature to see how it worked and saw my CPU go to temps I know it can reach with really heavy load.... however the core #1 and #2 went sky high.
The temp difference was up to 8°C on both cores....

Here's a screenshot...


My CPU temp is correct... however the core temps seem to be incorrect... unless they are correct but that would mean my CPU temp was always wrong.
Either way with a TCaseMax of 55°C hitting 53°C was a bit too much of a risk to take so I aborted the test..

Is this a program error.. a temp reading issue on my DFI-SLI DR or something else....?

[Fiery]

It's not a program error, it's absolutely normal. Diode temperature will always be higher than the external CPU temperature, simply because diode temperature shows the actual temperature of the inside of the CPU core -- whereas CPU temperature shows externally measured temperature.


Regards,
Fiery

[NightCrawler™]

I've never registered the diode temperature besides the external temperature as measured in the BIOS, Everest or any other temperature display program.
My main concern is what is to keep as temperature measurement in regards to a CPU's TCaseMax...?

Edit: this is my CPU: http://www.amdcompar...n=ADA4400DAA6CD
My TcaseMax is as mentioned 55°C
What does AMD use as their max temp as shown on the link... the core temp or the diode temp...?

This post has been edited by NightCrawler™: 29 June 2006 - 04:32 PM

[Fiery]

I think TcaseMax means the ambient temperature around the CPU (measured as "Motherboard" temperature in EVEREST).

Any diode temperatures under 75-80 Celsius should be just fine, don't worry about it.


Regards,
Fiery

[NightCrawler™]

Maybe I'm just a too big of a temperature junky LOL

TCaseMax is the max temperature a AMD CPU can have before it starts to degrade or in worst case scenario dies..

http://www.thecooles.../A64MaxTemp.zip
Each CPU is marked seperately with this max temp and this program reads that temp.
So a diode temp of 75-80°C would kill mine instantly....

[Fiery]

I'm sure TCaseMax is not the diode temperature, and not even the CPU temperature A64MaxTemp says my X2 4400+ S939 has TCaseMax = 57C. When running the Stability Test, the core temperatures are both above 60 Celsius, and my system works just fine.

BTW, on Conroe E6700 the CPU only starts to throttle down itself when the CPU diode temperature hits 100 (one hundred) Celsius


Regards,
Fiery

[Fiery]

Quote from the Athlon 64BIOS Design Guide:

"Case Temperature Specification (TCaseMax)—Bits 28-25. This field provides the case temperature specification for the processor."

So it's not related to the CPU diode (internal) temperature at all.

TCaseMax basically means the environment (ambient) temperature around the CPU should not exceed 57 Celsius. The CPU itself could be running at way higher temperature than that.


Regards,
Fiery

[NightCrawler™]

Edit... never mind.. I just read that. WOW! That's a shocker...

Unless the case is referred to as the IHS?

This post has been edited by NightCrawler™: 29 June 2006 - 04:56 PM

[Fiery]

It depends on where and how the CPU temperature is sensed...

When you have CPU Core temperatures, then you can just rely on them instead of the CPU temperature, since they're much more accurate.


Regards,
Fiery

[NightCrawler™]

So in that regards the temps as shown on AMD's site reflect external CPU temps and not the core temps...?

[Fiery]

TCaseMax is not CPU temperature, but system temperature

BTW, something to read:

http://forums.silent...pic.php?t=30774


Regards,
Fiery

[NightCrawler™]

On to reading.. interesting stuff so far...
BTW do you have a link to the Athlon 64BIOS Design Guide somewhere?

[NightCrawler™]

Already found the pdf...

So if I'm correct it's not the Tcase max we should be worried about but the Tcontrol max which is set at 70°C for a 4400X2

[Fiery]

Could be, yeah


Regards,
Fiery