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Tjmax 4930K (IB-E)


tistou77
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On Nehalem and later architecture Intel processors the processor itself has the TJMax value hard-coded in a MSR register.  AIDA64 will detect the TJMax value and use it for core temperature calculations.  The detected TJMax value can be checked on the Motherboard / CPUID page.

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Which document do you refer to?  But please note that Intel documents tend to have typos and small mistakes ;)

 

BTW, there're actually 2 methods to detect TJMax on an Ivy Bridge-E processor.  First one is the MSR method AIDA64 uses, and the other you can do it yourself if you want.  Make a HTML report of any pages of AIDA64, scroll to the bottom of the report.  Then start scrolling back until you reach the PCI device that's labelled:

 

Bxx D0A F00:   Intel Ivy Bridge-E/EN/EP/EP 4S/EX - Power Control Unit 0   ("Bxx" could be e.g. "BFF")

 

Under that label, find the line that starts with "Offset 0E0".  That line should look like:

 

Offset 0E0:   FC 33 00 00 00 0A 5F 00 40 9F 5A 00 40 9F 06 00

 

In that line the 7th register (starting from "FC"), register index 0xE6 will indicate your CPU's TJMax temperature in hexadecimal Celsius value.  If it reads 5F, then your CPU has a TJMax of 95 Celsius.  If it reads 5B, your CPU has a TJMax of 91 Celsius.  You can check the description of that register in the Ivy Bridge-E datasheet Volume 2 (Intel document number 329367-001) in section 6.1.8 TEMPERATURE_TARGET, bit 23:16.

 

http://www.intel.com/content/dam/www/public/us/en/documents/datasheets/4th-gen-core-i7-lga2011-datasheet-vol-2.pdf

 

Page 83 ;)

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For me

 

BFF D0A F00:   Intel Ivy Bridge-E/EN/EP/EP 4S/EX - Power Control Unit 0 

             

Offset 0E0:   18 36 00 00 00 0A 5F 00 40 9F 5A 00 40 9F 06 00    

 

 

E0E is different (not Offset 0E0:   FC 33 00 00 00 0A 5F 00 40 9F 5A 00 40 9F 06 00)

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For me

 

BFF D0A F00:   Intel Ivy Bridge-E/EN/EP/EP 4S/EX - Power Control Unit 0 

             

Offset 0E0:   18 36 00 00 00 0A 5F 00 40 9F 5A 00 40 9F 06 00    

 

 

E0E is different (not Offset 0E0:   FC 33 00 00 00 0A 5F 00 40 9F 5A 00 40 9F 06 00)

 

I've highlighted the only register that counts about TJMax (reg0xE6).  It shows 5F which is 95 Celsius.

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  • 1 year later...

I know it's been a while since this topic has been open but I have a question in relation to this thread.

I did the Aida64 test and I was curious about my TJmax. The result I got following the examples above was a 5A. So what does that mean my TJmax is?

The whole lines reads: 

Offset 0E0:  

54 31 00 00 00 0A 5A 00 40 9F 5A 00 40 9F 06 00

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