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Why do OCers set temp limits at 85 in prime? Prime doesn't equate to real world use. - Page 4

post #31 of 49
A lot of people here are scared of high temps.

If you have an i7 Tcase is 100C and if your core reaches that the chip auto throttles to prevent damage to silicone.

Degradation due to extreme heat does happen over time and might shave a couple of years off of your CPU (instead of lasting 8 years it might only last 5). This is seen by having to increase voltage to maintain stability at a set clock speed.

Personally I wouldn't worry about Prime95 temps below 90C as in real world usage you would never even go above 70C. Now, lets put in a 10C (or 5C) safety margin so make your Prime95 run at 80C and you're set to go.

Voltages for the i7 according to Intel is safe below 1.55V (many people say you can go higher if you have good cooling) so if you're at 1.45V you're doing just fine.
post #32 of 49
Quote:
Originally Posted by InsightSoul;12286070 
Voltages for the i7 according to Intel is safe below 1.55V (many people say you can go higher if you have good cooling) so if you're at 1.45V you're doing just fine.

AFAIK, that is not true.

No where does Intel list what the maximum safe voltage for the i7.

They do list the maximum possible VID, but there is NO correlation between what a maximum VID is and what a safe voltage is.

All that the VID range does it tell motherboard makers that they need to be able to provide a certain amount of voltage if that is required by a CPU that happens to have that VID.

That does not mean that a CPU will ever have that VID nor be safe at the voltage.

People keep confusing VID with Vcore.
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post #33 of 49
Quote:
Originally Posted by roflolol;12274632 
Well, prime95 is an ultra-extreme example, and no normal application, even benchmarks, will get a computer as hot as prime does. If I'm not folding, don't have crazy volts (Electromigration) and I'm running benchmarks that still fail to get the CPU above 80, why should I care if my chip gets to 86 degrees if I try to use it to calculate multi-million digit mersenne primes?

This post is of a mostly hypothetical nature, as I've hit a voltage wall on my OC and don't want to risk electromigration, but my agrument stands.

My temps are FINE. That's not the point of my question. My temps are excellent for air cooling and 4.4 Ghz. It only grazes 80 in prime. Considering my volts, my temps are perfectly acceptable.

Intel Burn Test is waaayy more intense than P95 ever thought of being. IBT is sometimes 10C+ what P95 will produce...

I prefer IBT, because I know I'm stable and temps will never be an issue after that.

It's the whole reason we stress test the way we do. If you're good for even just p95, you wont have a problem with the latest games. We overkill in testing to be safe for gaming.
    
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post #34 of 49
Quote:
Originally Posted by opt33;12278282 
Granted for every 10-15C drop in temps, you half the mean time to failure of cpu, so lower temps are better. .


Is that true? Is the MTBF for a chip running at 55c half of one that is running at 40c?

That would mean that a chip running at 70c has a significant MTBF difference than a chip running at 40c.
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post #35 of 49
Quote:
Originally Posted by opt33;12278282 
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.

proof.gif
post #36 of 49
Guys!!! Dont you think his temps are to high? He is using a Noctua D14...
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post #37 of 49
Thread Starter 
And 1.375 Vcore! I've reseated quite a few times and applied my thermal compound in a bunch of different ways. My temps are normal- it only just touches 80. The other cores are in the low 70s.
    
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post #38 of 49
Quote:
Originally Posted by roflolol;12287547 
And 1.375 Vcore! I've reseated quite a few times and applied my thermal compound in a bunch of different ways. My temps are normal- it only just touches 80. The other cores are in the low 70s.

Then, why the compliants? There perfectly fine temps for your OC at 100% load.

Youll never each that in real world application.

Prime95 is for testing how high your temps will go at 100%. Or if your CPU will be stable no matter what you throw at it.
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post #39 of 49
Quote:
Originally Posted by roflolol;12274582 
I know games don't use as much as prime does, but then why have overclockers deemed the limit to be 85 degrees celsius in an application that is totally unrealistic unless your rig is part of a supercomputing cluster or something?

Let me know when you complete a 12hour stress test at 99*c. Point is you dont want to blow the chip whilst stress testing, and as temps are a result of stress testing there is no way around it. We just got to stop stress testing at these high temps and that means we cant OC any further unless you get better cooling.
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post #40 of 49
Quote:
Originally Posted by Nutty Pumpkin;12287661 
Then, why the compliants? There perfectly fine temps for your OC at 100% load.

Youll never each that in real world application.

Prime95 is for testing how high your temps will go at 100%. Or if your CPU will be stable no matter what you throw at it.

Intel Burn Test (LinX) = 100% Max Temps ever

P95 is like 85% max temps by comparison now.
    
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