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Is this normal?

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Mine does it (5870) and has done it since it was new, it is caused by the GDDR5 and core changing speeds, and or a frame drawn that is changed before it gets fully rendered.
Pretty much this, I notice it sometimes with both of my 5870s.
 

OneMoar

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my 5750 also does it seems to be a trait of GDDR5
 
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The reason that it doesn't happen under Windows, is the AMD drivers actually hides it when the card changes clocks/ resolutions etc.
You see it under the bios screen is because the drivers aren't loaded yet.
 

hat

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Happens with my 5870 too, no big deal.
 

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my 5750 also does it seems to be a trait of GDDR5

My 6870s don't and they run GDDR5. I think it depends on the combo of GPU and monitor.
 
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