CPU stays at the same temperature

[videohalp]

Boot, enter BIOS, and there I would see the CPU's temperature slowly rising.

Work the CPU at 100%, say converting a video, and I would see the CPU's temperature rise a little.

The above is suppose to happen. But it did not when I downgraded my CPU. The temperature just stays the same.

The downgraded CPU is a working pull from another computer. Both CPUs and MOBOs in their former place displayed the CPU temperature fine.

I recently downgraded my CPU because the summer heat was bringing it above 50C/122F.

I am not interested in knowing solutions to cooling the faster CPU. I am fine with a slower CPU. I just would like to know why the downgraded CPU's temperature stays the same. I believe that it is a false reading.

[rallynavvie]

What kind of board, which processors were you using, and which processors are you using now?

BTW 50°C isn't terrible if that's the temp of the CPU. I think most modern CPUs have a threshold above 70°C. The Dell and HP workstations we use at work often approach that threshold because they are meant to be cheap desktop solutions and lack any complex cooling but they are still designed to keep the system within tolerance.

[minidv2dvd]

did you reset the motherboard bios when you changed processors? if not it may not be reading it properly. usually there is a reset all to safe mode or something similar that needs to be used before setting up your cusotm bios settings.

[redwudz]

BIOS readings may be accurate, but they often aren't the same as when the OS is operating. BIOS doesn't show the effects of fan control programs or drivers that can control the CPU temps through software. I find most times the BIOS temps will get higher after a bit of time.

Try a program like the freeware version of HWMonitor and see if your fan speed also changes with the temperatures when encoding. http://www.cpuid.com/hwmonitor.php That could explain the slight temperature rise compared to the BIOS readings.

And, as mentioned, your BIOS may not be fully compatible with your replacement CPU. But most are backward compatible. Check the motherboard manufacturers site and see what BIOS programs are available. Your present version should show at boot, or use a program like CPU-Z to see what it is. http://www.cpuid.com/cpuz.php

[videohalp]

Resetted BIOS to default settings did not work.
Resetting CMOS did not work either.

Temperature by a software hardware monitor matches that of BIOS.

CPU is a Duron. MOBO is MSI KM4M. I doubt this would be any use though.

MOBO manufacture site does not offer BIOS update.

The only thing I have not done yet is flashing the BIOS, which is risky stuff. Also, I do not have a floppy.