09-01-2014
75C is dangerously high. I wouldn't be surprised if it was into thermal throttling at that point.
Reducing the clockspeed could let it run at a similar pitch without thermal throttling.
It also depends what was in the 'software upgrade'. Any operating system components in there? Could have been misreading the temperature. Or you might be misreading it now, reading case/board temp while your cores are still cooked to the edge of oblivion.
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LEARN ABOUT OPENSOLARIS
tzmon
tzmon(7d) Devices tzmon(7d)
NAME
tzmon - ACPI Thermal Zone Monitor
DESCRIPTION
The tzmon is a pseudo driver that serves as an ACPI thermal zone monitor. Thermal zones are logical regions within a computer system for
which ACPI performs temperature monitoring and control functions. The number of thermal zones on a system with ACPI support varies. For
example, some systems may have one or more thermal zones, while others may have none. See the Advanced Configuration and Power Interface
Specification, (ACPI) Version 3.0A. for more details.
The tzmon handles thermal Zone events from ACPI and polls the temperature for each zone exposed by the ACPI implementation. If threshold
temperatures are reached, tzmon takes appropriate action. For example, if the temperature is sufficiently high and the ACPI implementation
supports it, tzmon initiates system shutdown.
Note that by default, system temperature control functions are usually performed by the BIOS and may supersede tzmon functions, depending
on the BIOS implementation. Also, many ACPI implementations expose no thermal zones and in these cases, tzmon performs no functions.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWckr |
+-----------------------------+-----------------------------+
|Architecture |x86/x64 only |
+-----------------------------+-----------------------------+
|Interface stability |Private |
+-----------------------------+-----------------------------+
SEE ALSO
attributes(5)
Advanced Configuration and Power Interface Specification, (ACPI), Version 3.0A.
SunOS 5.11 31 Oct 2006 tzmon(7d)