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Help with Overclocking Radeon HD 6950 Twin Frozr II Unlocked!

post #1 of 26
Thread Starter 
So I bought a used MSI Radeon HD 6950 Twin Frozr II off Craigslist and the guy who owned it before me had already unlocked it to the 6970 shader count. However, when I want to go overclock it, it is very, very limited in its ability to bring the core clock up at all, and the shader speed is completely greyed out. Did he do a poor job unlocking this? Should I revert back to 6950 shader count and just overclock it like that? I really have no experience with the 6900 series and overclocking, so any help is appreciated so I can get the most out of my card thumb.gif

Thanks!

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post #2 of 26
The reason why you will have such poor overclocking ability is because of 2 reasons. 1) the shaders that were locked were likely weaker than the others and so they are limited in how much they will overclock and 2) 6970s actually have a higher stock voltage than 6950s which means this card is actually running at a lower voltage than a 6970 so it won't overclock like a 6970.

As for the shader slider, that's for nVidia cards only and it should be greyed out.

If your temps are OK you could try increasing the voltage and that should get you some more clocks out of it!
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post #3 of 26
Thread Starter 
Good to know about the shader only being for nVidia. As for the overclocking, I see lots of people with a 6950 over 900MHz. Even the gigabyte version that Newegg is still selling comes factory OCed to 870MHz. However, what I meant to point out in the first post was that Afterburner only lets me push the slider up to 840. It comes stock as 810MHz, and caps at 840. My main question is why is the top limit set to only 840MHz on my card and why won't Afterburner let me go any higher than that?
    
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post #4 of 26
Quote:
Originally Posted by karmuhhhh View Post

Good to know about the shader only being for nVidia. As for the overclocking, I see lots of people with a 6950 over 900MHz. Even the gigabyte version that Newegg is still selling comes factory OCed to 870MHz. However, what I meant to point out in the first post was that Afterburner only lets me push the slider up to 840. It comes stock as 810MHz, and caps at 840. My main question is why is the top limit set to only 840MHz on my card and why won't Afterburner let me go any higher than that?

Ohhh, in that case it's a BIOS restriction that won't allow you higher than 840. If you want to go over that you will need to modify the card's BIOS to allow higher clocks.
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post #5 of 26
Thread Starter 
Quote:
Originally Posted by DirektEffekt View Post

Ohhh, in that case it's a BIOS restriction that won't allow you higher than 840. If you want to go over that you will need to modify the card's BIOS to allow higher clocks.

Oh ok, good to know. How exactly would I go about doing that and where would I find a BIOS that supports it?
    
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post #6 of 26
You are good, you need to "Open Up" Afterburner tongue.gif

do this: go in to My Computer/Programs/MSI Afterburner - find Config

Find the Enable Unofficial Overclocking EULA in the afterburner config file and put this after it: I confirm that I am aware of unofficial overclocking limitations and fully understand that MSI will not provide me any support on it

Also change Enable Unofficial Overclocking to "1".


Good Luck, and be safe with Voltage....
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post #7 of 26
Quote:
Originally Posted by Gulbis View Post

You are good, you need to "Open Up" Afterburner tongue.gif
do this: go in to My Computer/Programs/MSI Afterburner - find Config
Find the Enable Unofficial Overclocking EULA in the afterburner config file and put this after it: I confirm that I am aware of unofficial overclocking limitations and fully understand that MSI will not provide me any support on it
Also change Enable Unofficial Overclocking to "1".
Good Luck, and be safe with Voltage....

Damn! I forgot about unlocking afterburner! This *should* work. If it doesn't though, then you will need a BIOS mod for more clocks.
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post #8 of 26
Thread Starter 
Quote:
Originally Posted by Gulbis View Post

You are good, you need to "Open Up" Afterburner tongue.gif
do this: go in to My Computer/Programs/MSI Afterburner - find Config
Find the Enable Unofficial Overclocking EULA in the afterburner config file and put this after it: I confirm that I am aware of unofficial overclocking limitations and fully understand that MSI will not provide me any support on it
Also change Enable Unofficial Overclocking to "1".
Good Luck, and be safe with Voltage....

Well I did that, but all it did was turn everything to 0! Now my Afterburner's voltage is at 1112 (as it should be), but my Core Clock shows a value of 0, as well as my memory clock. If I slide them to their default clocks for my card (810/1250), and hit "apply" nothing happens and they just go back to zero, so now I can't change anything frown.gif

I did a quick Google search, and found a site saying I had to modify one registry string, which I did, but it didn't help at all. So now I can't do anything :-/

Does this mean I should download a new BIOS?
    
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post #9 of 26
That's really odd. If you turn off unofficial overclocking, does the core/memory clocks revert back to normal again?
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post #10 of 26
Thread Starter 
Quote:
Originally Posted by jdip View Post

That's really odd. If you turn off unofficial overclocking, does the core/memory clocks revert back to normal again?

Yup, they go back to normal again, but so does my ceiling of 840MHz maximum Core Clock :-/

Maybe it has something to do with the latest drivers?
    
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