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I love AMD

Like just now Core Temp showed a dip to 23c on the main core.

So the motherboard said 21c (outside the stress of Windows), and Core Temp said 23c (inside the stress of Windows).

How can that be a faulty motherboard reading?

I don't get it :confused:
 
gurusan said:
Open up the performance monitor pressing ctrl-alt-delete and you can see how much the processor is loaded. In windows the processor can be at 0% load as well you know.
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Add cool 'n' quiet to that and you could see some low temps.
 
fini said:
So you're now presuming that speedfan et al are deadly accurate? :confused:
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Depends on the version of Speed fan, the discrepancies are usually with Intel Core2 processors, due to the changing TJunc.

CoreTemp FAQ
Intel defines a certain Tjunction temperature for the processor. In the case of Yonah it is 85C° or 100C°. First of all the program reads from a Model Specific Register (or MSR), and detects the Tjunction temperature. A different MSR contains the temperature data, this data is represented as Delta in C° between current temperature and Tjunction.

So the actual temperature is calculated like this 'Core Temp = Tjunction - Delta'

The size of the data field is 7 bits. This means a Delta of 0 - 127C° can be reported in theory. But from preliminary tests, the reported temperature doesn't go below 0C°, no matter what kind of cooling was used.

AMD chips report the temperature by a special register in the CPU's NB. Core Temp reads that register and uses a formula provided by AMD to calculate the current temperature. The formula is: 'Core Temp = Value - 49'.

The sensor in AMD CPUs can report temperatures between -49C and 206C.
 
AdladUK said:
Like just now Core Temp showed a dip to 23c on the main core.

So the motherboard said 21c (outside the stress of Windows), and Core Temp said 23c (inside the stress of Windows).

How can that be a faulty motherboard reading?

I don't get it :confused:
Click to expand...

At the risk of sounding pedantic, it's like me holding up two thermometers and saying that one is right because it's a few degrees higher than the other.

Try loading up something like prime95 (or whatever the kids are using these days :)) and then check core temp. You should get some proper load readings then
 
z0mbi3 said:
At the risk of sounding pedantic, it's like me holding up two thermometers and saying that one is right because it's a few degrees higher than the other.
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Then in that case both the motherboard BIOS AND Core Temp software are wrong.

So this whole discussion is pointless any way
 
Thing is, what you saw in the BIOS was the heat slowly being transfered to the sensor on the motherboard, what Core Temp does is read from the sensor located directly on the chip for a more accurate reading.
 
z0mbi3 said:
Try loading up something like prime95 (or whatever the kids are using these days :)) and then check core temp. You should get some proper load readings then
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Oh I totally agree. Obviously we're talking idle temps here.

When I run Geekbench the main core goes up to 33c (31c average)

Still, that's not bad at all
 
AdladUK said:
Then in that case both the motherboard BIOS AND Core Temp software are wrong.

So this whole discussion is pointless any way
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Just use a bit of common sense with regards to possible temperatures and this discussion will be completely unnecessary.

On the plus side we've all had a refresher on fridges :)
 
Mekrel said:
CoreTemp FAQ
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I know how coretemp works, my point was simply that there's no reason to believe coretemp is deadly accurate. Yes it will tend to be more accurate than what the BIOS is reporting, but at the same time that doesn't mean it's hugely accurate - that's why all the decent review sites use probes.
 
oweneades said:
You orginally quoted 16 degrees as the core temp.

Coretemp (the program) showed 24-29 degrees. There is your 8 and 13 degree difference.
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That's a completely unfair comparrison.

16c was when I switched the machine on for the very first time.

21c is what the motherboard says now, after it's been on for around 3 hours, and Windows has been running etc.

The motherboad only shows the main core temp. So you can't do the 2 reading difference.

21c on the motherboad BIOS reading to 24c on Core Temp software. That's 3c difference.
 
AdladUK said:
Then in that case both the motherboard BIOS AND Core Temp software are wrong.

So this whole discussion is pointless any way
Click to expand...

CoreTemp isn't wrong, it's taken from a register in the actual processing core which is obtained from a DTS. Read what I wrote above.

The discussion is pointless, your motherboard sensors may not be that far off but it's always better to go by something that is known to be accurate (CoreTemp).

Your next motherboard can be 10+ degrees off :), basically don't trust motherboard read outs.
 
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