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Whats TJ. Max stand for? - Page 2

post #11 of 19
Thread Starter 
hmm i did not know that b4 i started oc'ing. doh.
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post #12 of 19
Bunch of idiots.



It's a clothing store! http://www.tjmaxx.com/index.asp

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post #13 of 19
I picked up a nice hoodie at T.J. Maxx
    
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post #14 of 19
Tj max stands for Tjunction Max, Tjunction is another word for core temps. All Intel Core processors have a Tj max with values that vary greatly, notebook processor Tj max values are known as they are provided from Intel. Desktop processors on the other hand are not documented and we can do nothing but guess.

Tj max is the maximum allowable temp for a processor's internal cores, if you reach Tj max the processor's THERMTRIP# signal will activate shutdown to prevent damage to the processor.
     
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post #15 of 19
I actually came in here wondering what T.J. Maxx stands for
    
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post #16 of 19
Quote:
Originally Posted by GigaByte View Post
Tj max stands for Tjunction Max, Tjunction is another word for core temps. All Intel Core processors have a Tj max with values that vary greatly, notebook processor Tj max values are known as they are provided from Intel. Desktop processors on the other hand are not documented and we can do nothing but guess.

Tj max is the maximum allowable temp for a processor's internal cores, if you reach Tj max the processor's THERMTRIP# signal will activate shutdown to prevent damage to the processor.
Correct. The TJ register is a countdown value. When it hits zero, the CPU will shutdown. However, Intel does not provide what the zero value's actual temperature for desktop parts. This TJ Max value varies between processors and steppings. Most application only assume the TJ Max temperature and therefore are not accurate.
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post #17 of 19
Tjmax was made up a few years ago by an intel software person in response to a question about desktop's unknown temp point where processor hot (PROCHOT#) is asserted. The term intel uses is TCC.

The CPU does not shut down when DTS=0, ie TCC/Tjmax is reached and prochot# is asserted, but it throttles, reducing frequency/voltage. It shuts down at 20-25C beyond TCC, or approximately 120 to 125C.

Quote from intel specs http://download.intel.com/design/pro...s/31873201.pdf

"An external signal, PROCHOT# (processor hot), is asserted when the processor core temperature has reached its maximum operating temperature. If the Thermal Monitor
is enabled, the TCC will be active when PROCHOT# is asserted....The TCC causes the processor to adjust its operating frequency (via the bus multiplier) and input voltage (via the VID signals). This combination of reduced frequency and VID results in a reduction to the processor power consumption."

http://download.intel.com/design/pro...x/31873401.pdf
"In the event of a catastrophic cooling failure, the processor will automatically shut down when the silicon temperature has exceeded the TCC activation temperature by approximately 20 to 25 °C. At this point the system bus signal THERMTRIP# goes active and power must be removed from the processor."

Many of us on xtremesystems have had our cpus at DTS=0 and beyond. On my E8400, at DTS=0, fluke or temp probe to casing of CPU reads ~94-95C, and at that point throttling (decrease in frequency occurs). My cpu shutdown when casing of my CPU read 118C (tjunction cant be lower), roughly 23C beyond the point where DTS=0.

In attached pic, you can see I am beyond DTS=0, this was done before realtemp existed, with coretemp. Unfortunately pic of IR gun is unclear...very difficult to angle camera just right to get all in focus...but point is cpu is not shutdown and I am past Tjmax/TCC.
LL
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post #18 of 19
Quote:
Originally Posted by HexT;3739171 
Bunch of idiots.



It's a clothing store! http://www.tjmaxx.com/index.asp

kungfu.giflachen.gif

Sorry for bumping an old thread, but this made me laugh so hard! LOL!!!!!
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post #19 of 19
Some temp monitors read the TJMax a little differently for different chips.

[URL="http://http://www.overclock.net/intel-cpus/476469-truth-about-temperatures-voltages.html"]The Truth about Temperatures and Voltages - Overclock.net - Overclocking.net[/URL]

I personally only run past 4ghz and over 1.4 volts for OCing instances. 24/7 there is no real performance increase on any programs I use (except maybe Ableton or Reaktor) leaving my clock so high. I usually keep it around 3.4 or 3.5 ghz and the voltage as low as possible.

Two good methods of OCing to use are one, to hit as high as possible for a 24 hour OC, and two select a usuable OC for 24/7 and find the lowest voltage/fastest RAM timings.
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