My Q9450 is running at 70C when doing next to nothing. I looked around the internet and someone said the digital thermal sensors on the 45nm chips are wrong. Is this true?
As far as I have read the DTS will have problems with certain software in the E8400. I would suggest making sure your BIOS and all the temp software you use is currently up to date.
There are known DTS (Digital Thermal Sensor) problems with 7000, 8000 and 9000 series processors which are most frequently seen as "stuck" temperatures that won't Idle down properly. Use Real Temp http://www.techpowerup.com/realtemp/ to "Test Sensors" and monitor your temperatures.
Please read the Real Temp documentation http://www.techpowerup.com/realtemp/docs.php so that you understand the sensor linearity problems that Real Temp addresses, and how it measures Core temperatures more accurately than the other popular temperature monitoring utilities.
Comp
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Q6600 G0 @ 3.6 | Xigmatek HDT-SD964
Ambient 22c | CPU 60c | Core 67c
Vcore Load 1.440 | VID 1.3000
Core 2 Quad and Duo Temperature Guide -->http://www.tomshardware.com/forum/ [...] ture-guide
closed_deal, Real Temp is currently the ONLY temperature monitoring utility known to be accurate on 45 nanometer processors.
Dark Comet, from the Real Temp documentation:
Requirements:
An Intel core processor and any modern version of Microsoft Windows XP or Vista, 32 or 64 bit. In order for this program to access the digital thermal sensor data it needs to be run with Administrator privileges. If you get the error message that the driver could not be installed then this is usually the problem. Right click on the program icon and select from the menu, Run As..., which will let you run this with the appropriate privileges if you have them. This program will not run in safe mode and does not support AMD processors.
Special thanks for the open source WinRing0 library / driver available from: http://openlibsys.org/
Message edited by CompuTronix on 05-13-2008 at 11:12:56 PM
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Q6600 G0 @ 3.6 | Xigmatek HDT-SD964
Ambient 22c | CPU 60c | Core 67c
Vcore Load 1.440 | VID 1.3000
Core 2 Quad and Duo Temperature Guide -->http://www.tomshardware.com/forum/ [...] ture-guide
Notice: A significant percentage of 45 nanometer processors are being reported with defective DTS sensors, which appear as unresponsive Core temperatures at lower Scale. Offsets between Cores exceeding 10c are also being reported. Sensors can be tested using Real Temp 2.5 - http://www.techpowerup.com/realtemp/
Message edited by CompuTronix on 05-13-2008 at 11:33:43 PM
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Q6600 G0 @ 3.6 | Xigmatek HDT-SD964
Ambient 22c | CPU 60c | Core 67c
Vcore Load 1.440 | VID 1.3000
Core 2 Quad and Duo Temperature Guide -->http://www.tomshardware.com/forum/ [...] ture-guide
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 4: Thermal Flow
Heat originates within the Cores, where Tjunction sensors are located within the hot spots of each Core. Heat dissipates from the bottom of the Cores through the CPU Case, which creates a thermal gradient toward the center of the Die, where the Tcase sensor is located. Heat then dissipates through the socket and motherboard to air inside the computer case. Heat also dissipates from the top of the Cores through the Integrated Heat Spreader and CPU cooler to air inside the computer case. Safe and sustainable temperatures are determined by CPU cooling efficiency, computer case cooling efficiency, Ambient temperature, Vcore, clock speed and Load.
Tjunction is always higher than Tcase.
Tcase is always higher than Ambient.
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.
(D) Intel shows Maximum Case Temperature (Tcase Max) in the Processor Spec Finder, which is the only temperature that Intel supports on Core 2 desktop processors. Ambient to Tcase Delta has known Offsets which vary with power dissipation and cooler efficiency, and can be Calibrated at Idle using a standardized Test Setup.
Ambient can be used to Calibrate Tcase at Idle.
(E) Intel does not provide documentation for Maximum Junction Temperature (
