Hi, After posting ticket 2054 I found ticket 2015. I applied the changes mentioned in 2015 to sensors.conf (commenting out the temp2 and temp3 lines) and then did sensors -s. That brought the CPU reading into line and ALSO restored memory bandwidth. The difference between what I saw (ticket 2054, slow CPU) and what 2015 saw (system shutdown) is determined by the BIOS setting Power -> CPU Thermal Option which can be either "throttle" or "shutdown". On my machine it was the former setting and for the 2015 ticket it was almost certainly the latter setting. In any case, the issue is resolved. Regards, David Mathog mathog at caltech.edu Manager, Sequence Analysis Facility, Biology Division, Caltech