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TJ Max for 1st Gen i7s

post #1 of 6
Thread Starter 
I was wondering what the real TJmax value for i7 9xx series is.

Realtemp sets it at a 100*C default, but I think since the i7 950 has a Tcase around 70*C (67.9*C to be exact), the TJmax value should be 90*C (since it is usally 20*C higher than the Tcase).

So; what do you people use as the TJmax value?
Edited by born2bwild - 1/11/11 at 12:31pm
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post #2 of 6
i've always assumed 100 C was the tjmax. most people often stay below 80 C under load anyway.
    
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post #3 of 6
Thread Starter 
Yeah I guess staying a good 20*C away from the TJmax is very safe.
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post #4 of 6
i7 cpus have tjmax in register in cpu set by INTEL at factory, realtemp and coretemp just read this value directly from cpu. So i7s and onward no more guessing of tjmax, if realtemp says 100, it is simply reading that from cpu, so it is accurate.

But your thinking is correct. If you measured the temp difference between IHS (reference tcase max) and core temp (tjmax), on stock settings at prime load, it probably would be 15-20C. But intel thinks in worst case scenarios, ie stock clock but with max vid, linx type load, high ambient, worst case leakage/power hungry cpu, and worst case scenario difference is 30C.
Edited by opt33 - 1/11/11 at 2:09pm
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post #5 of 6
Thread Starter 
Quote:
Originally Posted by opt33;11974311 
i7 cpus have tjmax in register in cpu set by INTEL at factory, realtemp and coretemp just read this value directly from cpu. So i7s and onward no more guessing of tjmax, if realtemp says 100, it is simply reading that from cpu, so it is accurate.

But your thinking is correct. If you measured the temp difference between IHS (reference tcase max) and core temp (tjmax), on stock settings at prime load, it probably would be 15-20C. But intel thinks in worst case scenarios, ie stock clock but with max vid, linx type load, high ambient, worst case leakage/power hungry cpu, and worst case scenario difference is 30C.

Hm... Good point.

Though the way I understood it, correct me if I'm wrong, is that Intel as you said does set a TJmax specifically for your chip at the factory, but the value is hidden, and what Realtemp and Coretemp see is merely the distance from the TJmax. And so your true core temp is measure from that.

This would also explain why changing the setting for TJmax changes the CPU's temperature but not its distance from the TJmax.
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post #6 of 6
Quote:
Originally Posted by born2bwild;11974921 
Hm... Good point.

Though the way I understood it, correct me if I'm wrong, is that Intel as you said does set a TJmax specifically for your chip at the factory, but the value is hidden, and what Realtemp and Coretemp see is merely the distance from the TJmax. And so your true core temp is measure from that.

This would also explain why changing the setting for TJmax changes the CPU's temperature but not its distance from the TJmax.

tjmax value was not software readable until i7's. But on i7's, and all cpus afterwards, intel made the register software accessible.

For example on old E6850, each one had an individual tjmax. Intel listed the tj on a chart, and said tjmax was actually higher since tj was just starting point, and all were calibrated higher. So tjmax was guessed at by IR measurements (since software could not access the reading). And temp was tjmax-distance to tjmax. And yes changing tjmax will never change the other register reading of - distance to tjmax.

On all i7s and after, tjmax is read directly from cpu. distance to tjmax is also read directly from cpu. So temp reading is accurate (within sensor error). And yes you can still change tjmax, and it will still only change the reading you get (wont alter distance to tjmax since it is read from another register).
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