here is sensors info and what's difference between CPU Temp and core 0/1 temp?

:~# sensors
it8712-isa-0a10
Adapter: ISA adapter
VCore 1:     +0.93 V  (min =  +0.00 V, max =  +4.08 V)
VCore 2:     +2.46 V  (min =  +0.00 V, max =  +4.08 V)
+3.3V:       +3.34 V  (min =  +0.00 V, max =  +4.08 V)
+5V:         +4.22 V  (min =  +0.00 V, max =  +6.85 V)
+12V:       +12.22 V  (min =  +0.00 V, max = +16.32 V)
-12V:       -19.51 V  (min = -27.36 V, max =  +3.93 V)
-5V:         -7.34 V  (min = -13.64 V, max =  +4.03 V)
Stdby:       +4.25 V  (min =  +0.00 V, max =  +6.85 V)
VBat:        +3.25 V
fan1:          0 RPM  (min =    0 RPM, div = 2)
fan2:          0 RPM  (min =    0 RPM, div = 2)
fan3:          0 RPM  (min =    0 RPM, div = 2)
M/B Temp:    +50.0°C  (low  =  -1.0°C, high = +127.0°C)  sensor = thermal diode
CPU Temp:    +68.0°C  (low  =  -1.0°C, high = +127.0°C)  sensor = transistor
Temp3:       +56.0°C  (low  =  -1.0°C, high = +127.0°C)  sensor = transistor
cpu0_vid:   +1.500 V

coretemp-isa-0000
Adapter: ISA adapter
Core 0:      +63.0°C  (crit = +100.0°C)                  

coretemp-isa-0001
Adapter: ISA adapter
Core 1:      +63.0°C  (crit = +100.0°C)

The location of the sensors are different.  The Core temperature sensors are on the CPU die.  The IT8712 temperature CPU temperature sensor is usually inside the 775 CPU socket, and close of those small capacitors.  Moreover, don't trust to much on the reported temperature, especially the CPU Core temperature, as it is a calculated value.  The CPU reports a value called 'thermal margin', which relates to how much more degree the CPU will go into safe mode to reduce heat.  It is not an absolute measurement of the CPU temperature, but an indication on how close the CPU is going to overheat.

My 2 cents.

Stephen Wong @ Hong Kong

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原帖由 stephenwong 於 2009-9-8 00:19 發表
The location of the sensors are different.  The Core temperature sensors are on the CPU die.  The IT8712 temperature CPU temperature sensor is usually inside the 775 CPU socket, and close of those small capacitors.  Moreover, don't trust to much on the reported temperature, especially the CPU Core temperature, as it is a calculated value.  The CPU reports a value called 'thermal margin', which relates to how much more degree the CPU will go into safe mode to reduce heat.  It is not an absolute measurement of the CPU temperature, but an indication on how close the CPU is going to overheat.

My 2 cents.

Stephen Wong @ Hong Kong


Thanks a lot for your help and explanation.

Now I notice a strange thing. When in BIOS the cpu temperature showing in BIOS is similar to M/B Temp showing in OS by using sensors command. ie. result of M/B Temp and CPU Temp are exchanged each other.  I don't know which one show the correct temp. BIOS or linux OS

ps . my system
cpu U2400 9w
chipset 945GM 7w

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