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c/w and "theoretical" temperatures

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mj3zero

New Member
Joined
Jun 13, 2001
Hi

if I have the rough c/w for a heatsink , the watts output by my cpu and an accurate measurement of ambient temperatures - I can work out a "theoretical" temperature.

BUT - is this theoretical temp

-max load - ie what I would get running BurnK6
-loaded - what Prime or folding might give
-an average
-the lowest / idle temp

The reason Im asking is that my actual and theoretical are off - the actul is quite a bit higher - no matter what the heatsink tested.

cheers
mj
 

cjtune

Member
Joined
Dec 18, 2000
Er, may I ask how exactly did you calc your theoretical temperature? Did you take account of the ambient temperature, fan airflow? BTW, your mobo temperature readings are not very accurate, so either your mobo's temp diode could be off a bit or your temp estimation by calc could inaccurate.
 
OP
M

mj3zero

New Member
Joined
Jun 13, 2001
Im taking the c/w from reviews and the manufacturers

Thermosonic Thermoengine with Delta = 0.25
Swiftech MC462 with Delta =0.16

Taking the ambient temperature from approximately 1' away from the fan intake (with the case open). This is with an accurate digital thermometer.

My cpu is at 1533,1.96v = 98.9 watts

Therefore I should be able to work out the cpu temperature.

As for the onboard sensors - I dont use them anymore. I fitted a thermistor to the sidewall of the cpu slug and it is plugged into a digital thermometer. I checked its accuracy before fitting it with 2 other thermometers - but I only checked it up to 65'c (70 is the max reading it will show).

What I am thinking is that the "theoretical" temp given by c/w and watts is totally dependant on WHAT the person who prints the c/w was doing at the time they worked it out.

I have been using BurnK6 to find my load temps because without a doubt it gives the highest temps of any benchmark / test app.

mj
 

Hoot

Inactive Moderator
Joined
Feb 13, 2001
Location
Twin Cities
Though I have not played with it extensively, there is a new version of Radiate.exe that seems to be able to do all calculations, both forward and back. It is an excellent improvement over the original version. I recommend it for every OC'ers toolbox of programs.

Hoot