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Trouble overclocking unlocked 6950 2GB

post #1 of 12
Thread Starter 
I managed to flash the 6970 BIOS onto the card (I now know this may not be the best way to go) and i'm running the card at stock 6970 clocks (880MHz/1375MHz). I've seen on here that some people are able to get riduculous clocks on their 6950s but even when I push up the clocks to lets say 900/1400 or even 900/1375 I get artefacts and some of my games crash. At 880/1375 they run fine but I do want to OC a bit to get a framerate increase. Should I flash the card back to the 6950 BIOS and just unlock the shaders and OC the card ie. is it the 6970 BIOS thats limiting me? Or will my card just no OC very well? I'm using stock cooling although i'm looking into getting this: http://www.scan.co.uk/products/arcti...idia-vga-cards

Any ideas? I'm on an XFX 6950 2GB reference card by the way - its got a BIOS switch.
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post #2 of 12
I have read that it's best to stick with the 6950 BIOS and just unlock the shaders rather than flashing the 6970 BIOS.
post #3 of 12
You need to up the Vcore.
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post #4 of 12
Some just don't OC well. That is all I can get as well. Anything higher then stock voltage for me is unstable too. My card won't even accept extra voltage period. Sucks, but at least I got the extra shaders and a slight oc.
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post #5 of 12
Thread Starter 
Quote:
Originally Posted by Kerian View Post
You need to up the Vcore.
Its running at 1.15v at the moment. And its reaching 83 degrees under stress (using GPU Tool to test). What should I push it to in order to keep the temps down around 85 but still push the clocks to say 910/1400 stable? I'm completely new to this. Using MSI Afterburner too.
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post #6 of 12
If you're new to OC'ing thing.
I would suggest not even messing with voltage etc.
Like I said, revert to stock BIOS and just unlock the shaders and go from there.
post #7 of 12
Not all chips are created equal. Find max core, then find max mem.
    
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post #8 of 12
Thread Starter 
Quote:
Originally Posted by PARTON View Post
Not all chips are created equal. Find max core, then find max mem.
How would I find the max core? What would you say this is around?
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post #9 of 12
Stock 6970 core is 1.175

When I had only one 6950 I ran this with about 50% fan and temps were okay.

Edit: I reread your post. Bump core by 10 MHz until it artifacts. Then back off or increase vcore. Keep your temps under 90C.
Edited by PARTON - 6/14/11 at 8:54am
    
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post #10 of 12
Dude, you're already overclocked a bit. Stock is 800/1250 and yer at 880/1375. If you can't go higher, it's probably a limitation of the silicon itself. The thing you have to realize, is that the 6970 bios already adds .07v, so flashing back to 6950 and unlocking shaders will net you less of an overclock until you go back and push even more voltage thru it.

Imo, stay where you are. You either have inadequate cooling holding your clocks back, or the silicon just isn't superman because really you already have a very well clocked card.
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