Overheated CPU

Hi,
my system configuration is as follows:

Motherboard: Asus P5GDC-V (1011.006)
Chipset: I915
CPU QFan-control: enabled
2 Chasis fans

CPU Type Intel Pentium 4 530J,
3000 MHz (15 x 200)
CPU Descr Prescott
CPU stepping E0
clocking rate 3000 MHz
Min / Max CPU Multiplier 14x / 15x
Engineering Sample Nein
L1 Trace Cache 12K Instructions
L1 Datacache 16 KB
L2 Cache 1 MB (On-Die, ECC,
ATC, Full-Speed)

Temperature:
Motherboard 39 °C (102 °F)
CPU 86 °C (187 °F)
Aux 19 °C (66 °F)
Maxtor 7Y250P0 41 °C (106 °F)
Maxtor 6Y080P0 40 °C (104 °F)

Fan:
CPU 4383 RPM

Microsoft Windows XP Professional
OS Service Pack Service Pack 2

Software:
Microsoft Offics appl.
Image management
Backup application (Acronis Trueimage)
Virus detection
Web browser (Mozilla Firefox)
other


Problem:

When I boot my system or reactivate from standby the following symptoms
occur which never occur before:
I run applications e.g. Backup app., web browser (FF) or open Windows
explorer in thumbnail view of a folder that contains images ,
CPU usage rises to 95%-100% permanent.
As a result CPU temperature rises from about initially 60°C to 90°C+ withing
10 minutes, CPU fan speed starts at 2900RPM
and fanspeed rises very slowly at the same time CPU temp rises to 90°C+,
when the systems suddenly shuts down because of overheated CPU.

As soon as CPU usage is less than 10%, CPU temperature stays around 70-80°C,
and CPU fan speed is ~4000RPM or falls below 2000RPM.

Does any has an explanation why
a) CPU usage of applications incl. windows explorer gets about 100%
b) CPU temp gets overheated
c) while CPU temp is above 80°C CPU fan speed rises very slowly (after
system boot)


Appeciate any thoughts to troubleshoot.
Thanks in advance.

-Bodo

Bodo wrote:
> Hi,
> my system configuration is as follows:
>
> Motherboard: Asus P5GDC-V (1011.006)
> Chipset: I915
> CPU QFan-control: enabled
> 2 Chasis fans
>
> CPU Type Intel Pentium 4 530J,
> 3000 MHz (15 x 200)
> CPU Descr Prescott
> CPU stepping E0
> clocking rate 3000 MHz
> Min / Max CPU Multiplier 14x / 15x
> Engineering Sample Nein
> L1 Trace Cache 12K Instructions
> L1 Datacache 16 KB
> L2 Cache 1 MB (On-Die, ECC,
> ATC, Full-Speed)
>
> Temperature:
> Motherboard 39 °C (102 °F)
> CPU 86 °C (187 °F)
> Aux 19 °C (66 °F)
> Maxtor 7Y250P0 41 °C (106 °F)
> Maxtor 6Y080P0 40 °C (104 °F)
>
> Fan:
> CPU 4383 RPM
>
> Microsoft Windows XP Professional
> OS Service Pack Service Pack 2
>
> Software:
> Microsoft Offics appl.
> Image management
> Backup application (Acronis Trueimage)
> Virus detection
> Web browser (Mozilla Firefox)
> other
>
>
> Problem:
>
> When I boot my system or reactivate from standby the following symptoms
> occur which never occur before:
> I run applications e.g. Backup app., web browser (FF) or open Windows
> explorer in thumbnail view of a folder that contains images ,
> CPU usage rises to 95%-100% permanent.
> As a result CPU temperature rises from about initially 60°C to 90°C+ withing
> 10 minutes, CPU fan speed starts at 2900RPM
> and fanspeed rises very slowly at the same time CPU temp rises to 90°C+,
> when the systems suddenly shuts down because of overheated CPU.
>
> As soon as CPU usage is less than 10%, CPU temperature stays around 70-80°C,
> and CPU fan speed is ~4000RPM or falls below 2000RPM.
>
> Does any has an explanation why
> a) CPU usage of applications incl. windows explorer gets about 100%
> b) CPU temp gets overheated
> c) while CPU temp is above 80°C CPU fan speed rises very slowly (after
> system boot)
>
>
> Appeciate any thoughts to troubleshoot.
> Thanks in advance.
>
> -Bodo
>

Well, the shutdown means it is really overheating, and this is not
just an issue with inaccurate temperature readings.

I'd remove the CPU heatsink, reapply thermal paste (Arctic Ceramique or
Arctic Silver, not too much, just a thin layer to take the place of any
air gap). Refit the CPU heatsink and test it again.

The slowly rising CPU fan speed, means the computer case air is getting
warm too. You should have one fan, in addition to the fan on the PSU,
mounted on the back of the computer. On my computer, I have a rear 120mm
square fan, exhausting air from the computer case. The delta between
case air temperature and the room temp right now, is 28C - 25C = 3C on
my computer. Good computer case cooling, achieves no more than a 7 to 10C
delta between case air temp and room temp. If your computer case temp is
a lot higher than the room temperature, work on improving air circulation
through the computer case. I removed the plastic bezel on the front of my
computer, to make more room for air to flow inwards.

+------------------------+
<--- PSU fan |
|
<--- Exhaust fan |
|
| Intake
|Computer case Vent <--- Intake vent big enough
|Airflow diagram | to allow good airflow.
+------------------------+

HTH,
Paul