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Can't overclock XFX 5970 Black Edition to 850 Mhz

post #1 of 7
Thread Starter 
I was thinking about getting a 5870 to crossfire with the XFX 5970 Black Edition so I wanted to test if I can raise my 5970s core clock to the 5870s 850 Mhz.

I used the CCC Overdrive and when I used the "Test Custom Clocks" function it showed the test picture but with many little yellow dots in it, I guess they are called artifacts and show that the overclock does not work. Then the screen just turned black, when I tried to get back to the desktop. I rebooted at that point.

The 5970 runs at the moment at 800 Mhz core and 1100 Mhz memory speed. It does so for a few weeks now without problems. But the 850 Mhz don't seem to run.

Any idea if it may still be possible to get to those 850 Mhz or did I just get a bad card that does not overclock well?

Edit: I've also used afterburner earlier to overclock.
Edited by 12Honk34 - 5/18/11 at 5:11am
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post #2 of 7
In order to get it to 850 Mhz you'll need to bump the voltage.

To do so, download MSI Afterburner then come back here and you'll find many threads about overclocking ATI GPU..

A first start would be 1.125 Volt for the core.
This may lead you to 850Mhz.
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post #3 of 7
Thread Starter 
The card doesn't let me alter the core volts. It's not accessible in Afterburner. The sliders for Core Voltage, Shader Clock and Fan Speed are all not highlighted and can't be modified.

Anything else I could do or am I screwed?
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post #4 of 7
IIRC you have to enable those options in the settings menu in afterburner. Click on settings in the lower right hand corner.
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post #5 of 7
Thread Starter 
Quote:
Originally Posted by A.D.D. View Post
IIRC you have to enable those options in the settings menu in afterburner. Click on settings in the lower right hand corner.
Thanks, I've found the voltage control unlock, but nothing for Shader Clock and Fan Speed. But the voltage control is the most important anyway, I suppose.

Will the fan speed up by itself accordingly, if I overclock and increase the volts? Do I need to increase the Shader Clock as well?
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Burger with Fries
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post #6 of 7
Quote:
Originally Posted by 12Honk34 View Post
Thanks, I've found the voltage control unlock, but nothing for Shader Clock and Fan Speed. But the voltage control is the most important anyway, I suppose.

Will the fan speed up by itself accordingly, if I overclock and increase the volts? Do I need to increase the Shader Clock as well?
ati cards dont have shaders

and, fan speed can be unlocked by clicking the "auto" button and turning it off
 
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post #7 of 7
Thread Starter 
Quote:
Originally Posted by srsparky32 View Post
ati cards dont have shaders

and, fan speed can be unlocked by clicking the "auto" button and turning it off
The auto button can't be clicked, it's not activated, not highlighted. The tooltips tell me though, that the fan control can't be activated if the card doesn't have a fan controller chip.
Edited by 12Honk34 - 5/18/11 at 11:20am
Burger with Fries
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Burger with Fries
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