Can this temp be correct?

Phatsacks · 11-30-2007, 08:55 PM

Speedfan and PC Wizard 2008 agree on the temp.

The room is 18c to 20c. The temp on the processor is showing 9-10c.

This is approx 50f and just doesn't seem right.

Note: The processor is the 45w AMD BE-2300, not in an ATX case (bench test), AMD stock cooler, and artic silver 5 thermal paste.

10C is 50 F, and as much as AMD would like this to be true, it simply can't (right?).

Phatsacks · 12-01-2007, 12:48 AM

Did some research and it seems so!

Link

Quote:

As with the wattage, all three processors ran at nearly the same range, each with 1°C of each other. The AMD Athlon X2 BE-2350 was the coolest of the three chips, idling at 15°C.

That was in a case, while this is in open air bench test. Difference of ~5c (9 degrees F) based on enclosed system versus open air on a bench could produce the 5c delta easily.

Edit: I'm calling my recorded temp 10C because the 9C in the picture was at that exact second. It actually sits at 10C.

Rob Withey · 12-01-2007, 03:03 AM

Wow, I am very surprised that a processor manages to cool itself below ambient. That is one neat processor.
Do you have some kind of refrigeration cooling on it?

Phatsacks · 12-01-2007, 03:18 AM

Quote: Originally Posted by Rob Withey

Wow, I am very surprised that a processor manages to cool itself below ambient. That is one neat processor.
Do you have some kind of refrigeration cooling on it?

Retail CPU, so a stock AMD CPU fan, and arctic silver 5 thermal paste.

It still makes me think the thermal offset for the cpu was miscalculated by AMD.

Arrow · 12-01-2007, 06:49 AM

No friggin way.. I have a beefy processor, but mine runs at about 45*C. Much much hotter than yours. That's crazy!

DeltaFX · 12-03-2007, 03:29 AM

Seems like your Pc Wizard doesn't understand your mobo. I'm quite sure the item labelled ACPI Thermal Zone is the real cpu temp

Phatsacks · 12-03-2007, 11:48 PM

No that's the ACPI for sure.

There is no way the temp is above 25C, as it's open air and energy efficient cpu. My enclosed 65w CPU (also an X2) runs 27C idle, with nothing other than stock cooling and stock paste (whatever they used).

Three programs all said it's about 10C. I used PC Wizard 2008, Speedfan, and I think CPUIdleExtreme.

The OC'ers who dumbed down the voltage prior to OCing it in the link I provided had it running at 15C in an enclosed case (about 9 degrees F difference).

Do I think it's right? I'm still doubtful, but the OCing link, and three programs are slowly convincing me otherwise.

Wish there was a cheap way to manually test it (cheap way!)

2k1Toaster · 12-04-2007, 01:08 AM

You cannot passivly cool a CPU lower than ambient temperature...

Unless you keep your room at 50F, it is impossible. Physics says so...

Rob Withey · 12-04-2007, 01:18 AM

Quote: Originally Posted by 2k1Toaster

You cannot passivly cool a CPU lower than ambient temperature...

Unless you keep your room at 50F, it is impossible. Physics says so...

Hence my surprised message earlier.

Phatsacks · 12-04-2007, 09:20 AM

I don't disagree. That's the reason I was looking into the toffset (the correction degrees for being off on actual temp) for the processor series. It's my guess that AMD got them wrong.

The range that seems appropriate for the setup/cpu is 20c or a degree or two higher (room temp), which I stated earlier.

Someone find me a cheap way to manually test~

I stopped the CPU fan for about 30 seconds, and none of the temps went up...so that didn't help, and I didn't want to do it longer than that. Going to run prime95 later to see if anything goes up a couple degrees.

Edit:

This work? I'm sure I can find one locally, buy it and return it.

2k1Toaster · 12-04-2007, 04:17 PM

Very simple way to check if the 10C is correct.

Touch your heatsink. Is it cold like a fridge? If so, then it is 10C. Is it hot, then probably 35-40. Does it feel the same, then ambient. If you want real readings, any temp probe will work. Most accurate you need to slide it in the thermal paste but taking the CPU out is a little extreme for curiosity.

Phatsacks · 12-04-2007, 04:35 PM

Cold like the a metal heat sink that hasn't been cooling anything (several minutes of use).

Took a suggestion and went into PC Health in the Bios, seems the above "Mainboard Temperature" (in the picture) is the CPU temp.

The bios had it at 25C, then I stopped the fan and it went up to 30C. The CPU Max Tcontrol 40C never changed, while the Mainboard one shortly after stopping the fan.

I'll use this information, and play with Prime95, and fan stopping to watch what all changes. It should be the Mainboard Temp in the above pic and nothing else.