CPU temps

[Vu Pham]

Tony Alfrey wrote:
> Vu Pham wrote:
>> Tony Alfrey wrote:
>> [...]
>>
>>
>>>> Kurt
>>>
>>> Yes, but are 26C and 28C really the temperatures of your CPU?  This 
>>> is lower than body temperature.
>>>
>>>
>>
>> As long as it is higher than room temperature then it is possible, I 
>> think.
> 
> Yes, but it will be higher than the ambient air temperature in the box. 
>  The finned heat sink itself will be higher than that and the CPU 
> (sensor is where? - maybe on silicon in the chip?) will be higher still. 
>  I see from specs that a Pentium IV can dissipate some 60-ish watts when 
> operating under substantial load (not idle).  I see that a typical big 
> fan/heat sink combination for CPUs has a thermal impedance of about 0.6 
> C/W.  So 60 watts x 0.6 C/W yields a CPU case temp of 36 C above 
> ambient.  If ambient in the box is perhaps a little above room temp, 
> let's say 35 C then the CPU is at 71 C.  I see that Intel specs a 
> maximum case temperature of 85 C.

My office temperature is about 19 oC. My Quad CPU under normal load is 
46 oC and it is overclocked pretty hards so I guess without OC, its temp
should go down dramatically.
> 
> So Kurt is right:  103 C is too high, but 26 C sounds as though the CPU 
> is totally at idle.
> 
> BTW, how do you make that little °C symbol from the keyboard?

I use the letter o :)

> 
> I don't know stink about computers but I know physics.

Nobody doubts it :)

Btw, where do you live ? When you say the temp is about 35 oC, I 
remember long time ago, where I worked sometimes had no AC, and room 
temperature could go up to 37 oC, and one day the IBM PC/AT just stopped 
working because of heat.

Vu