This is a copy pasta that any overclocker would like to read
Look at the various temperatures for ur processor
Also CPU will never get blown but it will literally shutdown when u take it to beyond 80C(down throttling occurs beyond 80C and at 85C the CPU shuts down)
1.2V(varies from 0.875V-1.325) is the default Vcore for core2duo and maximum CPU VTT non operational Voltage is 1.55V(can only attain)
Scope
The purpose of this Guide is to provide users with an understanding of thermal relationships, so that C2D platforms can be uniformly tested, properly analyzed, and accurately monitored. This Guide is not an Engineering Document, and does not address unnecessarily diverse or complex technical details. Certain strict definitions have therefore been relaxed to simplify concepts and enhance comprehension. This Guide applies to air cooled mainstream Desktop C2D processors.
Background
Intel has 2 distinct C2D thermal specifications, and provides a test program, Thermal Analysis Tool (TAT), to simulate 100% Thermal Load. Some users may not be aware that Prime95, Orthos, Everest and assorted others, may simulate loads which are intermittent, or less than TAT. These are ideal for stress testing CPU, memory and system stability over time, but aren't designed for testing the limits of CPU cooling efficiency.
Some users also may not know that C2D's feature 3 sensors at 2 different temperatures; a single on-die Tcase sensor (between the Cores), and dual Tjunction sensors (one within each Core). Consequently, there is much confusion regarding specifications, calibration Offsets and test methods, so results can be difficult to decipher and compare. Therefore, when expressing Idle & Load test Results, it's also necessary to define the Variables as:
Results
Tcase = Idle & Load
Tjunction = Idle & Load, Hottest Core
Variables
Ambient = Room Temp
Chipset = Model
C2D = Model
CPU Cooler = Model
Frequency = CPU Clock
Load = Test Program
Motherboard = Model
Vcore = CPU Voltage
Thermal Flow
Heat originates within the Cores, and is hottest where the dual Tjunction sensors are located. Heat is then dissipated throughout the CPU die to the socket and motherboard, and to the Integrated Heat Spreader, where the single Tcase sensor is located between the Cores, and the temperature is ~ 15c cooler. Heat is then transferred to the CPU cooler, and finally to air inside the computer case, where all 3 C2D temperatures are determined by computer case cooling efficiency, Ambient temperature, and Vcore. At 100% Load, Tjunction is ~ 15c higher than Tcase, and Tcase is always higher than Ambient.
Specifications
Intel's Thermal Specification: *processorfinder.intel.com/d [...] Spec=SL9S8
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 = 15c
Thermal Sensor Accuracy = +/-1c
Tjunction max = 85c (B2 Stepping)
Tjunction max = 100c (L2 & G0 Stepping)
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 specs, however, it is not recommended to operate overclocked processors above 60c.
** 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.
** L2 and G0 Stepping have higher Tjunction max specs, however, it is not recommended to operate overclocked processors above 75c.
Findings
(A) TAT can be used simultaneously with SpeedFan for benchmarking Desktop C2D's at 100% Thermal Load.
(B) The Delta between Tcase (BIOS, Motherboard Utilities and SpeedFan: CPU or Temp X) and Tjunction (TAT and SpeedFan: Core 0 / Core 1) is ~ 15c +/- 3c.
(C) 50c Tcase and 65c Tjunction are safe and sustainable temperatures.
Overclocking
Intel's Thermal Design Power (TDP) spec of 65 watts can be exceeded by over 50% when CPU frequency is aggresively overclocked, and Vcore is increased to maintain stability. Intel's Vcore max spec of 1.3525, when increased much beyond 10%, or 1.5 Vcore, makes it challenging to maintain safe temperatures with air cooling. As Ambient temperature increases, overclock frequency and Vcore may need to be decreased.
Every CPU is unique in it's overclock potential, voltage tolerance, and thermal behavior. If the maximum stable overclock is known at 1.35 Vcore, then each increase of .05 volts will typically allow a stable increase of ~ 100 Mhz, and will result in a corresponding increase in CPU temperatures of ~ 3 to 4c. Ambient and Vcore are the most dominant Variables affecting temperatures.
At 1.35 Vcore, ~ 300 Mhz of additional overclock remains until safe temps are exeeded due to increased Vcore. Example; at 22c Ambient, if a C2D is stable at 3.0 Ghz - 1.35 Vcore - 45c Tcase / 60c Tjunction @ TAT 100% Load, then it may also be stable at 3.3 Ghz - 1.5 Vcore - 55c Tcase / 70c Tjunction @ TAT 100% Load, with highly effective CPU cooling and computer case cooling.
Tools
SpeedFan 4.32 displays all 3 Tcase and Tjunction sensors: *www.almico.com/speedfan.php
Intel's Thermal Analysis Tool (TAT): *www.techpowerup.com/downloads/392/mirrors.php
Orthos: *www.techpowerup.com/downloa [...] _2004.html
Testing
PECI = Enabled
Vcore = Manual
C1E / EIST = Disabled
CPU Fan = Manual, 100%
Computer Case Fans = Manual 100%
Computer Case Covers = Installed
Primary Test = TAT @ 100% 10 Minutes
Alternate Test = Orthos @ P9 Small FFT's 10 Minutes
TAT will expose insufficient CPU cooling and computer case cooling, or excessive Vcore and overclock. At no other time will a CPU be so heavily loaded, or display higher temperatures, even when OC'd during worst-case / real-world loads. After CPU thermal behavior has been benchmarked with TAT, then Orthos or assorted other programs can be used with SpeedFan to observe less extreme CPU temps, while stress testing for system stability. Orthos Priority 9 Small FFT's simulates 88% of TAT ~ 5c lower. During gaming and applications, Core 0 typically carries heavier loads and higher temps than Core 1.
Scale
The temp scale shown below illustrates the normal ~ 25c Delta between Idle and TAT @ 100% Load, and the typical ~ 15c Delta between Tcase and Tjunction on an example system overclocked with 1.4 Vcore. 50c Tcase and 65c Tjunction are safe and sustainable temperatures.
-Tcase/Tjunction-
--60--/--75--75--Hot
--55--/--70--70--Warm
--50--/--65--65-- N
--45--/--60--60-- O
--40--/--55--55-- R
--35--/--50--50-- M
--30--/--45--45-- A
--25--/--40--40-- L
--20--/--35--35-- Cool
Results
Tcase = 30c Idle, 50c Load (SpeedFan: CPU or Temp X)
Tjunction = 45c Idle, 65c Load (SpeedFan: Core 0 / Core 1) Hottest Core
Variables
Ambient = 22c
Chipset = 975X
C2D = E6600
CPU Cooler= AC Freezer 7 Pro
Frequency = 3.5 Ghz
Load = TAT @ 100% 10 minutes
Motherboard = Asus P5W DH
Vcore = 1.4
The typical ~ 25c Delta between Idle and Load will vary among systems due to inconsistencies such as Ambient temp, Vcore, clock speed, CPU cooling, computer case cooling, graphics cooling, and software processes. Excessive background processes running simultaneously may not allow low Idle temps. Low Vcore and stock clock may result in low Idle to Load Delta while running Orthos (88% Thermal Load). Conversely, high Vcore and overclock may result in high, or out of spec Idle to Load Delta while running TAT (100% Thermal Load).
The typical ~ 15c +/- 3c Delta between Tcase and Tjunction will vary among systems between Idle at low Vcore, and Load at high Vcore. Erroneous chipsets, super I/O chips, BIOS releases, driver versions, and motherboard utilities often compound temperature inaccuracies. Intel's thermal sensor spec is +/-1c, so temperatures may be very accurate on hardware / firmware platforms free of manufacturer's deficiencies. Temperatures which have Offsets can be analyzed, and when corrected in SpeedFan, may still be accurate.
Heat Score
The following items will enable users to estimate cooling efficiency, identify problem areas, and visualize how environment and system configuration impacts real-world thermal performance. Graphics cards which Recirculate heat are a major cause of high temps in gaming rigs, therefore, cards designed with Rear Exhaust are preferred.
(A) Ambient:
3 = Over 24c
2 = 22c to 24c
1 = Under 22c
(B) CPU Cooler:
3 = Stock or Low End
2 = Mid Range
1 = High End
(C) Computer Case Cooling:
3 = Needs Improvement
2 = Fair
1 = Excellent
(D) Frequency:
3 = Heavy OC
2 = Moderate OC
1 = Stock or Lite OC
(E) Graphics Cooling:
3 = Recirculate - SLI
2 = Recirculate - Single Card
1 = Rear Exhaust - Single Card / SLI / CrossFire
(F) Hard Drives:
3 = 4 or More
2 = 2 or 3
1 = 1
(G) Vcore:
3 = Over 1.42
2 = 1.35 to 1.42
1 = Under 1.35
Total: (Example System)
(A) = 2
(B) = 2
(C) = 1
(D) = 3
(E) = 1
(F) = 2
(G) = 3
Heat Score = 14
Scale:
17 - 21 = Hot
12 - 16 = Warm
7 - 11 = Cool
Parameters
(A) Vcore should not exceed ~ 1.5v.
(B) Tjunction is always ~ 15c higher than Tcase.
(C) Tcase is always higher than Ambient.
(D) Tcase Idle should be ~ 1 to 15c higher than Ambient.
(E) Tjunction Idle should be ~ 15 to 30c higher than Ambient.
(F) Tcase Load should not exceed ~ 60c with TAT, and 55c with Orthos.
(G) Tjunction Load should not exceed ~ 75c with TAT, and 70c with Orthos.
(H) Idle to Load Delta should not exceed ~ 25c.
(I) Tjunction Results are Hottest Core Idle and Load.
Troubleshooting
(A) Vcore will typically sag ~ .025 volts under Load.
(B) Offsets between Core 0 / Core 1 of ~ 3c are normal.
(C) SpeedFan 4.32 can be configured to correct for Tcase and Tjunction Offsets.
(D) SpeedFan 4.32 may detect Tcase (CPU or Temp X) as Temp 1, Temp 2 or Temp 3.
(E) If TAT will not run, then Orthos Priority 9 Small FFT's simulates 88% of TAT ~ 5c lower.
(F) Any hardware and / or software may misreport Tcase and / or Tjunction temps.
(G) 965 chipsets may misreport Tcase and Tjunction temperatures with +/-15c Offsets.
(H) 6X0 chipsets may misreport Tcase and / or Tjunction accuracy with non-linear scaling.
(I) If Tcase is higher than Tjunction, then enabling PECI in BIOS may correct inverted temps.
(J) Core Temp 0.9X Tjunction 85c or 100c is Intel`s Tj max spec, is not a temp, and doesn't change.
(K) C2D's manufactured with concave Integrated Heat Spreaders may report high Deltas and temps.
(L) An improperly seated CPU cooler is the leading cause of abnormally high temperatures.
(M) Ambient and Vcore are the most dominant Variables affecting temperatures.
Offsets
If temperatures don't meet the Parameters, then SpeedFan 4.32 can configure Offsets to correct for Tcase (CPU or Temp X) and Tjunction (Core 0 / Core 1). From the "Readings" tab, click on the "Configure" button, then click on the "Advanced" tab. Next, click on the "Chip" field directly under the tabs, then use SpeedFan's "Help and HOW-TO" icon included in the installation Program Group.
Under "Contents" click on "How to configure" then click on "How to set Advanced Options". Read this section including "Other interesting options" and "Temperature x offset". When configured, SpeedFan will display all 3 Tcase and Tjunction temperatures correctly. SpeedFan is also extremely useful for observing temperatures and Vcore using the "Charts" tab, while thermal benchmarking with TAT or Orthos.
Tips
(A) Tcase = SpeedFan: CPU or Temp X.
(B) SpeedFan: Temp 1, 2 or 3 = Temp X.
(C) Tjunction = SpeedFan: Core 0 / Core 1.
(D) SpeedFan temperatures should be configured to "Show in Tray" Core 0.
(E) During gaming and applications, Core 0 typically carries heavier loads and higher temps than Core 1.
Notes
(A) Masscool Shin-Etsu X23 Thermal Interface Material (TIM) can reduce CPU temps by ~ 4c. Although X23 is not well known, it is far superior to Arctic Silver 5, and is simply the best TIM for CPU cooling.
Shin-Etsu X23 is available at the following sites:
*www.chillblast.com/product.php?productid=16932
*www.ajigo-store.com/se7783d.html
*www.crazypc.com/products/50118.html
*www.watercoolingshop.com/ca [...] s_id=496&o sCsid=78
*www.specialtech.co.uk/spsho [...] id=1236&ca t=0&page=
(B) This Guide may be frequently updated as new processors and information becomes available.
~~~ I hope this helps to make sense of C2D temperature alphabet soup. Thank you for reading. ~~~
Source-
*www.tomshardware.com/forum/221745-29-core-temperature-guide
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