As far as I understand, it's the temperature in the case. I think it's the system temperature.
I'm using PCM-3363D-1GS8A1E. As per datasheet, it's operating temperature range is 0-60°C; whereas, it's BIOS shows CPU and System temperatures as two separate values, which are always different too.
Please clarify when put of CPU and System temperatures correspond to Operating temperature range given in the datasheet.
Besides, please also clarify whether the operating temperature range given in the datasheet is of the CPU die or ambient temperature.