Unstable temperature reading

[hucker]

On an old laptop (Intel core i3 M350 4 core CPU), Tthrottle is showing temperatures fluctuating between 70 and 84C in the space of half a second.  Is this normal?  If a part of a CPU was really changing temperature that fast surely it would fall to pieces with thermal stresses?

Here is the output from MSI Afterburner showing the 5 sensors, CPU and core1-4, and the CPU usage.



Isn't this very bad for the CPU?  For now I've turned tthrottle off, and look what happens:



I don't even understand what's happening, surely without throttling, doing more work, it should be hotter now?!