I am using XP pro, P4 machine. Have MBM5 installed and was showing CPU temp 82-87f on average. Temp suddenly went up to 171f and the alarm went off. Shut down immediately, gave it time to cool and when rebooted, all was fine again. Can anyone suggest what may have caused this I dont want the CPU frying itself. This has not happened before to my knowledge, it is not overclocked and the fan in running OK.
I've hazard a guess at MBM5 being out of order here, believe you me your pc would have shut down long before MBM5 could record that kind of temperature and it actually being accurate, the problem being that MBM5 is most likely not using the correct probe in a proper manner and therefore activates the shutdown procedure. Your most reliable source of cpu temp is in the bios, check there first.
Whoa, got ahead of myself, I've just realised the temps are stated as being in fahrenheit and not celsius, your original 82-87f is fine, the 171f is very hot, approx 77c. I'd still recommend checking the bios before relying on a software based probe.
If it's a p4 machine then the likelihood of the bios having the ability to read cpu temps is high, it should also be the case that it will have a cut off point with which you can set yourself. However, don't just rely on the probability, have a look and confirm it, just don't go making changes if your not confident in doing so.
Just to make sure, disable or uninstall MBM5, run your pc for an hour or so under some stress and reboot, checking the bios temp as you do, if you only see a small rise in temp, all is perfectly normal, you can breathe easy.