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We are testing a prototype system at extremely low temperature and see event viewer WHEA warnings and an occasional BSOD. We see no errors at ambient temperatures. Other than an occasional error during CPU sorting all other PT tests run fine at all temperatures. Can you expand on what the CPU Physics test is doing vs the other CPU tests?
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To get a BSOD something has likely gone wrong in the O/S itself or a device driver. You don't get a BSOD from an desktop application fault.
It might be that you are seeing random corruption from the RAM and the CPU, but with the other tests you get lucky and the corruption doesn't effect any kernel space resources. For example the results of a prime number calculation might be wrong, but you would never notice, as it doesn't provoke a crash.
The physics test uses significantly more RAM than most of the other CPU tests. So maybe that is related.
This page gives an overview of the benchmark tests.
You also might want to consider using BurnInTest, as it does a lot more error checking for data corruption.
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