The operating temperature of X540-T2 is 0-55 C as stated in the marketing data sheets.
The 0-107C refers to Tcase temperature which is a temperature measurement using a thermocouple embedded in the center of the heat spreader.
You may refer to this website about Tcase temperature: http://www.intel.com/support/processors/sb/CS-033342.htm
Thank you for the information. Please clarify
"The 0-107C refers to Tcase temperature which is a temperature measurement using a thermocouple embedded in the center of the heat spreader."
implying the X540 has an Integrated Heat Spreader (IHS). Yet from the data sheet pg 1187
here it says "(but IHS is not present for the X540)".
So the X540 does not have an Integrated Heat Spreader?
Also, please confirm that with no heat sink or airflow, maximum ambient temperature is 55C. I understand Tcase will be 107C if the ambient reaches 55C (no heat sink or airflow).
See table 14-3 - "X540 Expected Tcase and Tj (°C) for 11.43 mm High Heat Sink at 12.5 W (JEDEC Card)".
0-70° C is possible when using enough airflow (300 LFM) and the proper thermal solution. The 0-55°C is published specification for 200 LFM (which is the marketing target for LFM for this Intel Ethernet silicon).