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Why do OCers set temp limits at 85 in prime? Prime doesn't equate to real world use. - Page 3

post #21 of 49
I believe the 85C max from Intels spec sheet is referring to tcase and not tjunction.
post #22 of 49
FYI black ops loads the cpu almost to 100% during loading a map , so if ur cpu aint stable ..bsod or freeze . Having ur cpu stable on prime assures u , ur cpu will never give u a problem at that speed .
    
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post #23 of 49
Quote:
Originally Posted by techheadtrevor View Post
Yes , yes, of course.. how could I have missed it! It is called common sense. You know that thing in the back of you mind telling you that something your about to do is a bad idea. AS I have stated before...85C or even 90C might not kill your cpu in 5sec...but why put your cpu through that for a minor overlclocking gain? I think it is funny that you guys use intels 95C throttle temp as a safe max.
Using the chips own self preservation mechanism as a temp limit is asinine. That mechanism is meant to save the chip from immediate death, and you say 5c away from that is fine?

The rest of us actually care about our systems.
yes. that is exactly what I am saying.

let's see, Intel designs the chip so that if it goes about 95 (or whatever) that it throttles.

If you are saying it is NOT safe to run it at length when it is at 90, then wouldn't common sense say that Intel would throttle it at 90 or 85 or 80?

Nothing wrong with babying your chip, but this is OVERCLOCK.net after all.
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post #24 of 49
Temperature limits are also great if you might be having problems with your pc. I had a friend not know why his computer kept shutting down. It was because it triggered a temp limit and shut it down. Turns out his heatsink was coming loose (Intel Stock).
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post #25 of 49
Quote:
Originally Posted by Bleached View Post
Temperature limits are also great if you might be having problems with your pc. I had a friend not know why his computer kept shutting down. It was because it triggered a temp limit and shut it down. Turns out his heatsink was coming loose (Intel Stock).
Exactly. Intel figured out at what temp the CPU should not be running. It isn't about throttle to prevent instant death, it is about throttle or shutting down to keep the CPU below a safe temp.
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post #26 of 49
Thread Starter 
Just to clarify- I am not planning on cranking the volts- I have hit a wall that can't be overcome without at least another half volt, and that would be 90 degree temperatures and potential electromigration and degradation for a gain of MAYBE 100 MHz.
    
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post #27 of 49
Quote:
Originally Posted by roflolol View Post
Just to clarify- I am not planning on cranking the volts- I have hit a wall that can't be overcome without at least another half volt, and that would be 90 degree temperatures and potential electromigration and degradation for a gain of MAYBE 100 MHz.
I know what you are talking about here. And I have been thinking the same as you.

Prime95 small FFTs and IBT is totally overkill. And as you've said, no application or game will ever come close to those temps.

So I've been thinking, If i reach 85C in IBT for a short while, and with stability, that should be fine... Because the worst game/application you run will be at least 20C lower.

So...
    
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post #28 of 49
Folks. 85C is the tcase reading, which is the temp reading of the heatspreader. If you are using Core Temp or Real Temp to get a gauge on your temps, they are reading the core temp reading (tjunction).

Typically there is 15C - 20C reading difference between tcase and tjunction. If your core temp is reading 85C, likely your tcase is only reading 70C.
post #29 of 49
I think roflolol meant if you run prime for 8-12 hours and max temp is 90C and your stable, then over the next 3 years of real world use your cpu temp never goes over 60C, then no need to worry about prime temps. Unless, for example, you fold with loads like prime.

Granted for every 10-15C drop in temps, you half the mean time to failure of cpu, so lower temps are better. But the temps that matter, for those that are concerned with them, are temps during real use over years, not what you do 1 x for 12 hours.
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post #30 of 49
Quote:
Originally Posted by opt33 View Post
I think roflolol meant if you run prime for 8-12 hours and max temp is 90C and your stable, then over the next 3 years of real world use your cpu temp never goes over 60C, then no need to worry about prime temps. Unless, for example, you fold with loads like prime.

Granted for every 10-15C drop in temps, you half the mean time to failure of cpu, so lower temps are better. But the temps that matter, for those that are concerned with them, are temps during real use over years, not what you do 1 x for 12 hours.
Your point is true ,of course. However, running your chip at 90C for 12 hours could severely limit its life span, if not physically damage it. You might not know its damaged, it migh still run, but the problem is these flaws compound.
Maybe you stress it again at 80C next time, it handled 90C, why not 80C? but since its already stressed or damaged from the 90C test it can't take 80C anymore and fails or BSOD or it decreases the lifespan again. And you wouldn't have a clue.

The scrary thing about high temps is the uncertainty, there is no way to know if your chip is doing well or not. The more you stay away from high temps, the more certain you can be that your chip will, handle anything you need it to do, and last as long as you want.
Edited by techheadtrevor - 2/5/11 at 8:58pm
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