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my 6870's dying? - Page 4

post #31 of 52
1.275 isn't that much.
Dunno
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post #32 of 52
Thread Starter 
^^ i know.

but my cards do get a bit hot. with 1.275 they can hit 92c in furmark.

and 81c in gaming.
    
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post #33 of 52
Quote:
Originally Posted by Yoko Littner View Post
how did degradation happen?
Too much voltage for the temperature you were running, for too long a period of time.

Anything under 1.3v isn't automatically safe.

1.275v is still a very significant overvolt for a 6870. Certainly more than what I would put through them on air, and your results are a perfect example of why.

Quote:
Originally Posted by Kasp1js View Post
1.275 isn't that much.
Obviously too much for these particular samples.

Quote:
Originally Posted by Yoko Littner View Post
^^ i know.

but my cards do get a bit hot. with 1.275 they can hit 92c in furmark.

and 81c in gaming.
Would be safe at stock speed/volts, but that's too hot for 1.275v and 1GHz.

Faster you go the colder things need to be to last.
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post #34 of 52
Thread Starter 
stock is 1.175.
    
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post #35 of 52
Quote:
Originally Posted by Yoko Littner View Post
^^ i know.

but my cards do get a bit hot. with 1.275 they can hit 92c in furmark.

and 81c in gaming.
That would be too hot for my taste, personally. Did you check your VRM temps? They would've definately hit high temps for sure, maybe they are what cause the crashes (unstable due to overheating?)
    
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post #36 of 52
I am nut sure but HD 69XX have some horrible voltage chips. I can get 925Mhz stable with stock (1.175) voltage and i need 1.25v for 950Mhz. I am not sure but it could also be driver related as the drivers crash when OC is not stable but does not make sense. All i can say is that Heat has cause you the problem, If any of the cards has gone over 80C then VRMs have hit 110C for sure cause them to degrade.
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post #37 of 52
Thread Starter 
how do i check VRm temp's? and what is safe for them

EDIT: if i set fan speeds up past 70% no problem's.. they stay at 75c then...
    
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post #38 of 52
Quote:
Originally Posted by ZealotKi11er View Post
I am nut sure but HD 69XX have some horrible voltage chips. I can get 925Mhz stable with stock (1.175) voltage and i need 1.25v for 950Mhz. I am not sure but it could also be driver related as the drivers crash when OC is not stable but does not make sense. All i can say is that Heat has cause you the problem, If any of the cards has gone over 80C then VRMs have hit 110C for sure cause them to degrade.
69xx are heat limited OC wise. Put a waterblock on it and it will OC darn good.
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post #39 of 52
Thread Starter 
then where can i get a pair of dual slot cooler's? all i can find are triple slot one's which wont work on my config.
    
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post #40 of 52
Quote:
Originally Posted by Kasp1js View Post
Sounds like the core or the vrm's overheating
Boom!^^^^^^^^^^^^^^^
Exactly what i thought.

When using higher voltages its no longer the core temps you should focus on,its the vrm temps,after all they are under much more strain supplying the core with extra voltage.

I have had 4 x5870s now and 3 of them were water cooled.

Everytime i overclocked to a voltage of 1.3v+ on the water cooled cards the vrms would sometimes hit 52-54 degrees plus while the core would be like 34 degrees tops.
Imagine what the vrms are like on an aircooled card after few hours gaming


Maybe its the VRMs that are damaged,it would make logical sense with your issue being instability that could well be caused by an inability to supply voltage like before.

RMA
Edited by superj1977 - 1/25/11 at 12:34pm
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