So what should I set the TJ Max to be on my i7 920 D0?
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The Truth about Temperatures and Voltages - Page 60
post #592 of 5991/4/11 at 4:49amIt depends on what the T-Case of your cpu is.Quote:Originally Posted by Elite-
So what should I set the TJ Max to be on my i7 920 D0?
(Quote from the article): You will not begin to throttle because of temps until you are approximately 20C above Thermal Specification. For example, the Thermal Specification (Tcase) of the Q6600 G0 is 71C. At approximately 91C, it will begin to thermally throttle. This then makes sense why the TJ Max target is 90C
Not sure if this was mentioned already or not, but after reading this, from what I'm understanding, If an Intel i3 core is overclocked to 4ghz with a Thermal Specification (T-Case) of 72.6°C, then the pc will not begin to thermally throttle until approximately 92.6°C which would mean TJ max would be set at about 91.6°C.
If all the above is correct, then I'm assuming for long term use and reliability, I would want to run my cpu at 70°C or less on max load, is that right?
Edited by xebian13b - 1/4/11 at 4:51am
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The idea of T-Case and TJ Max are designed around each other but they are not strictly made from each other. The TJ Max for a Core i7 9x0 should be ~100C for all chips. UncleWebb the designer of RealTemp specifically stated that his software was not pulling the TJ Max values off of the die, because the value isn't clear in it's marking.Quote:Originally Posted by xebian13b
It depends on what the T-Case of your cpu is.
(Quote from the article): You will not begin to throttle because of temps until you are approximately 20C above Thermal Specification. For example, the Thermal Specification (Tcase) of the Q6600 G0 is 71C. At approximately 91C, it will begin to thermally throttle. This then makes sense why the TJ Max target is 90C
Not sure if this was mentioned already or not, but after reading this, from what I'm understanding, If an Intel i3 core is overclocked to 4ghz with a Thermal Specification (T-Case) of 72.6°C, then the pc will not begin to thermally throttle until approximately 92.6°C which would mean TJ max would be set at about 91.6°C.
If all the above is correct, then I'm assuming for long term use and reliability, I would want to run my cpu at 70°C or less on max load, is that right?
TJ Max and T-Case are not transient numbers. TJ Max for almost all 45nm Core iN (where N is 3,5,or 7) is 100°C. Don't set the TJ Max to 91.6°C, because realistically they are building in a larger/more conservative gap, but TJ Max is still ~100°C.
For long term use and stability, you could pretty much run your CPU up to almost 100°C and be fine, but your overclock will suffer and I don't really reccomend it. I choose 88°C as a personal limit, because above that I see alot of lose of stability in my overclocks.
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post #594 of 5991/4/11 at 9:07amThanks for clearing that up, I was just reading what the OP posted. Wow how long have you been running your cpu with that 88°C limit? Just curious. Realistically I was thinking about setting TJ max to maby high 70's to 80's range to be safeQuote:Originally Posted by ChickenInferno
For long term use and stability, you could pretty much run your CPU up to almost 100°C and be fine, but your overclock will suffer and I don't really reccomend it. I choose 88°C as a personal limit, because above that I see alot of lose of stability in my overclocks.
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I've been running that for the last year and a half or so, but realize I am saying 88°C with a TJ Max of 100°C (Distance to TJ Max=12). The reported temp changes by changing TJ Max, but the distance to TJ Max is constant.Quote:Originally Posted by xebian13b
Thanks for clearing that up, I was just reading what the OP posted. Wow how long have you been running your cpu with that 88°C limit? Just curious. Realistically I was thinking about setting TJ max to maby high 70's to 80's range to be safe
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post #596 of 5995/10/11 at 3:26pmMy PC randomly shuts down for quite some time now. My first thought was that my CPU probably gets overheated, espacially because after a random shutdown it won't boot again right away. I need to wait a couple of minutes and then it boots with no error messages. But the results from RealTemp baffle me and I don't know how to understand them..
I've set TJ Max to 70c. How can then distance to TJ Max be 118?
EDIT: It turns out that the distance to TJ Max data is stored in a 7-bit variable, so when CPU gets hotter than set TJ Max (decreases to 0), it wraps around and starts counting down again from 127...
Edited by angua89 - 5/12/11 at 3:42pmpost #597 of 5996/20/11 at 6:00amHey ChickenInferno,
What would be the TJ Max to set for a i5 2500k @ 4.2Ghz OC'd? I am using Real Temp 3.67 right now and getting idle temperatures at around 28c. I currently have it set to 90.
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But of course, i have some questions:Quote:Originally Posted by ChickenInferno
If you run at or below the Absolute Maximum Voltages for your CPU, you should never experience degredation or lose of life on your CPU. Overclocking will not decrease the lifetime of your CPU if and only if certain criteria are met.
1.) Electrical Specification must be satisfied (1.55v for 65nm Core 2 Series and 1.45v for 45nm Core 2 Series, 45nm Core i7/i5 list 1.55v as their maximum, and 32nm Core i5 list as 1.40v. Make sure you check all other voltage specifications for VTT and CPU PLL. (Dram voltage on the i7 is a different story).
ChickenInferno
I have 2700K, what Electrical Specification must be satisfied? Like for 32nm Core i5, -1.40? Or i can go even to 1.52?
I ask becouse of this: http://www.overclock.net/t/1159500/1-45v-core-voltage-is-safe-for-i7-2600k-2700k
Just wan't to know my limits, how far i can go to be below the Absolute Maximum Voltages?Quote:Originally Posted by ChickenInfernoMoreover, if a device is subjected to these conditions for any length of time then, when returned to conditions within the functional operating condition limits, it will either not function, or its reliability will be severely degraded.
Please use common sense, good cooling, and test stability stringently; and you shouldn't have any problems.
ChickenInferno
Do we have any proof? Did anyone manages to meet above criteria and to confirm that there was no degradation after a couple of months, 1-2 year maybe?
I would be pleased with 1 year
Thank you again
Edited by lodestar - 9/28/12 at 5:19pmReturn HomeBack to Forum: Intel CPUs- The Truth about Temperatures and Voltages
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