Elisha: On my E6400 I have run Orthos stable for half an hour at 3200 MHz with my processor within a degree of starting to throttle. At 3400 MHz the absolute core temperature can't go beyond 75C while running Orthos before it crashes within seconds but it can run Orthos stable for hours at 3400 MHz as long as the core temperature stays down in the low 70C range.

If you are at or near your maximum MHz overclock then you will need to run your processor at a lower core temperature to maintain stability. The CPU temperature reported by SpeedFan is based on an inaccurate diode reading. Intel designed the DTS because the diode based temperature readings weren't accurate enough so ignore the SpeedFan reported CPU temperature.