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Cixert

High temperature caution! but the heat sink is cold.

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Posted (edited)

One of the computers I use still has a Pemtium IV Northwood 3.06 Ghz with Hypertreading. I have it set in the BIOS to notify me when the processor temperature reaches 80º C.
As soon as I turn on the computer, in the post the alarm begins to sound. So I open the lid and touch the heat sink, it's completely cold.
When I start XP, if I load many programs, the computer freezes (understand by heat) but the heat sink is still cold.
Aida 64 indicates 80-85º C and fan 2800 rpm. while other computers with Pentium IV Northwood 2.8 Ghz without HT indicate 35ºC and 4500 rpm fan.
Do I have a fan problem or could the temperature sensor be defective?

Edited by Cixert

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Sounds more like you have lost *any* thermal contact between the processor and the heatsink, like if the heatsink has moved away from the processor . :dubbio:

jaclaz

 

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Posted (edited)

@ Cixert

Turn off the PC, remove/unplug the power line, remove the heat sink, clean old thermal compound (on it and on processor), apply new thermal compound, reinstall heat sink, replug power line and reboot PC.  Problem should be solved unless there is a failure on the temperature sensor.

alacran

Edited by alacran

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Posted (edited)
On 6/23/2020 at 2:15 AM, alacran said:

@ Cixert

Turn off the PC, remove/unplug the power line, remove the heat sink, clean old thermal compound (on it and on processor), apply new thermal compound, reinstall heat sink, replug power line and reboot PC.  Problem should be solved unless there is a failure on the temperature sensor.

alacran

The strange thing is that I put the thermal paste 4 months ago. Before, I had another processor, a 2800 Mhz.
At first I had no problems but for 2 months I have had these problems with 3060 Mhz processor

Edited by Cixert

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Too much, too less, improper cleaning of old paste or a bad quality paste may cause it.  Also make sure the heat sink is firmly attached to the processor.

Here you have processor specs: https://ark.intel.com/content/www/us/en/ark/products/27499/intel-pentium-4-processor-supporting-ht-technology-3-06-ghz-512k-cache-533-mhz-fsb.html

As you can see TCASE is 69° C, where TCASE  or Case Temperature is the maximum temperature allowed at the processor Integrated Heat Spreader. So it means it has been overheated, AFAIR the highest temp during heavy loads (running AIDA 64 stress tests or whatever it was called on those times) I used to get on those processors was about 60 to 62° C

If applaying new paste do not fix the issue it may be time to raplace the equipment, after all that processor and MB are from 2002 or 2003 (17 to 18 years old) and that's a long time.

alacran

Edited by alacran

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When I went to check the paste, the plastic that holds the closure has broken so I have changed the fan and heatsink. At the moment there is no temperature problem, it is around 57º C. and at the moment I have not put thermal paste. But I keep the computer cover open.
I have several questions why the old fan could fail. It sounded weird, like it was forced to spin at high speed and couldn't cool down. I can think of several possible causes.
1-Fan too close to the heatsink could impede an air flow.


2-The turbine in the cover was too far from the fan, preventing air circulation. Here I think that either the turbine is approaching or it is suppressed.
371895758_DSC_0008pequeo.thumb.jpg.7de2137d6c5cfe6d73cf7b2b45900f62.jpg

3-There is a metallic sticker attached to the heatsink.

Is this useful? When I touch it, it doesn't absorb the heat from my finger

105095707_DSC_0024pequeo.thumb.jpg.1b33b6cae211d35f2ab58eed307d331f.jpg


 

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