Shadow703793, sorry, but just to keep it straight, BIOS reports CPU temperature (Tcase) and the DTS reports Core temperatures (Tjunction).
gomerpile, BIOS is not always correct, and DTS means Digital Thermal Sensors, which are located within each Core. Also, there is no Analog Thermal Sensor located "under" the CPU. The erra of the thermocouple in the motherboard socket under the CPU is history. Today's modern processors have the Analog Thermal Sensor integrated within the processor die. From the Core 2 Quad and Duo Temperature Guide:
http://www.tomshardware.com/forum/221745-29-core-quad-temperature-guide
Section 1: Introduction
Intel provides separate thermal specifications for
2 different sensor types; a CPU Case (not computer case) Thermal Diode located within the CPU die between the Cores, and
Digital
Thermal
Sensors located within each Core. The Case Thermal Diode measures
Tcase (
Temperature
Case), which is CPU temp, and the
Digital
Thermal
Sensors measure
Tjunction (
Temperature
Junction), which is Core temp. Since these sensors measure
2 distinct thermal levels, there is a constant temperature gradient between them, which is
Tcase to
Junction Delta. C2Q`s have
1 Tcase and
4 Junction sensors, while C2D`s have
1 Tcase and
2 Junction sensors.
Section 5: Findings
(
A)
Tcase is acquired on the CPU Die from the CPU Case Thermal Diode as an analog level, which is converted to a digital value by the super I/O chip on the motherboard. The digital value is
BIOS Calibrated and displayed by temperature software.
BIOS Calibration affects the accuracy of
Tcase, or CPU temperature.
(
B)
Tjunction is acquired within the Cores from Thermal Diodes as analog levels, which are converted to digital values by the
Digital
Thermal
Sensors (
DTS) within each Core. The digital values are
Factory Calibrated and displayed by temperature software.
Factory Calibration affects the accuracy of
Tjunction, or Core temperatures.
(
C)
Tcase and
Tjunction are both acquired from Thermal Diodes.
Tcase and
Tjunction analog to digital (A to D) conversions are executed by separate devices in different locations.
BIOS Calibrations from motherboard manufacturers,
Factory Calibrations from Intel, and popular temperature utilities are frequently inaccurate.
I hope this clears up any misconceptions.
Comp