3. Specifications
Intel's Thermal Specification:
http://processorfinder.intel.com/Default.aspx
Thermal Specification:
* The thermal specification shown is the maximum case temperature at the maximum Thermal Design Power (TDP) value for that processor. It is measured at the geometric center on the topside of the processor integrated heat spreader.
X6800 = 60c, Vcore max = 1.3525, TDP = 75w / E6X50 = 72c, Vcore max = 1.3500, TDP = 65w
E6X00 = 60c, Vcore max = 1.3525, TDP = 65w / E6X40 = 72c, Vcore max = 1.3500, TDP = 65w
E4X00 = 60c, Vcore max = 1.3250, TDP = 65w / E6X20 = 60c, Vcore max = 1.3525, TDP = 65w
** For processors without integrated heat spreaders such as mobile processors, the thermal specification is referred to as the junction temperature (Tj). The maximum junction temperature is defined by an activation of the processor Intel® Thermal Monitor. The Intel Thermal Monitor's automatic mode is used to indicate that the maximum TJ has been reached.
Ambient Temperature = 22c
Idle to Load Delta Max = 25c
Tcase to Tjunction Delta = 10 to 15c
Thermal Sensor Accuracy = +/-1c
Tjunction Max = 85c (B2 Stepping)
Tjunction Max = 100c (G0, L2, M0 Steppings)
4. Interpretation
* The first part of the spec refers to a single measuring point on the integrated heat spreader, which is in contact with the CPU cooler. Since there is no laboratory test sensor at this location, the CPU Case Thermal Diode is used to display the CPU temp in BIOS, where thermal tables are flashed to emulate the heat spreader. This is the CPU die temperature measured between the Cores. Thermal Case Temperatures of 60c is hot, 55c is warm, and 50c is safe. The single CPU Thermal Case sensor is how Tcase is measured, and is the CPU temperature displayed in BIOS, Motherboard Utilities, and SpeedFan: CPU or Temp X.
* E6X50 and E6X40 have higher Tcase Max specs, however, it is not recommended to operate processors, overclocked or stock, above 60c Tcase.
** The second part of the spec refers to mobile processors without an integrated heat spreader, measured by internal Digital Thermal Sensors (DTS). Since Intel's Thermal Analysis Tool (TAT) is a Notebook tool, and desktop C2D's have an integrated heat spreader, TAT will typically indicate ~ 2c lower than SpeedFan. These are the dual Core temperatures measured within the hot spot of each Core. Thermal Junction temperatures of 75c is hot, 70c is warm, and 65c is safe . The dual Thermal Junction sensors are how Tjunction is measured, and are the dual Core temperatures displayed in TAT, and SpeedFan: Core 0 / Core 1.
** G0, L2 and M0 Stepping have higher Tjunction Max specs, however, it is not recommended to operate processors, overclocked or stock, above 75c Tjunction.