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GTX 280 weird overclocking problem

post #1 of 9
Thread Starter 
I seem to have run into a problem with either eVGA precision, or the way the core and shaders behave once overclocked. The shaders will not run the 1512 MHz strap without making artifacts in games, so the highest they can go stable is one strap below that, which is 1458MHz. Problem is, the core can only go up to 729MHz, unless I raise the shaders to the next strap. Why is this? I thought unlinking them is the way to avoid a situation like this, but it won't OC the core anymore, no matter what i do. Anyone else have this problem, and is there any way to make my core OC higher?
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post #2 of 9
Bump. I don't know but I'm looking at this card so it'd be nice to know.
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post #3 of 9
Quote:
Originally Posted by ljason8eg View Post
I seem to have run into a problem with either eVGA precision, or the way the core and shaders behave once overclocked. The shaders will not run the 1512 MHz strap without making artifacts in games, so the highest they can go stable is one strap below that, which is 1458MHz. Problem is, the core can only go up to 729MHz, unless I raise the shaders to the next strap. Why is this? I thought unlinking them is the way to avoid a situation like this, but it won't OC the core anymore, no matter what i do. Anyone else have this problem, and is there any way to make my core OC higher?
They cannot run at ratio < 2:1, 729x2=1458
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post #4 of 9
Oh. I hate how we can't rep y'all.
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post #5 of 9
Thread Starter 
Quote:
Originally Posted by grunion View Post
They cannot run at ratio < 2:1, 729x2=1458
Oh ok that makes sense. I wonder if making the card run cooler than 85C would help the shaders OC any more?
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post #6 of 9
Quote:
Originally Posted by ljason8eg View Post
Oh ok that makes sense. I wonder if making the card run cooler than 85C would help the shaders OC any more?
You've tested the core/mem to rule them out?
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post #7 of 9
Thread Starter 
Quote:
Originally Posted by grunion View Post
You've tested the core/mem to rule them out?
Yes. I can have the memory and core stock and it'll artifact in the 1512 shader strap. Anything i can do short of a volt mod (which i'm not sure even exists with this card)?
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post #8 of 9
Quote:
Originally Posted by ljason8eg View Post
Yes. I can have the memory and core stock and it'll artifact in the 1512 shader strap. Anything i can do short of a volt mod (which i'm not sure even exists with this card)?
What fan speed @ 85°c?
I rma'd a GTX260 that would artifact around 90°c @ 100% fan speed, stock clocks.
The replacement is a beast, does the 1566 strap easy and runs mid 60's @ 60% fan speed.
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post #9 of 9
Thread Starter 
Quote:
Originally Posted by grunion View Post
What fan speed @ 85°c?
I rma'd a GTX260 that would artifact around 90°c @ 100% fan speed, stock clocks.
The replacement is a beast, does the 1566 strap easy and runs mid 60's @ 60% fan speed.
I just leave it on Auto fan speed. It never lets it get hotter than 85C. Gets to around 55% fan speed depending on how hot the room is. The highest i've ever seen it was during furmark it got up to 66% at 85C. I'm sure the temps at 100% would be in the mid 60s. Think that could make it more stable?
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