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Want to unlock and OC a 6950, but don't know best method.

post #1 of 6
Thread Starter 
Hello everybody. New here. I decided to join as most of the useful 6950 info I have came from either here or techpowerup. I'm looking to buy 2 MSI reference 6950s in the very near future, and of course I am going to want to unlock shaders and OC. But even after reading about these cards for a couple weeks, I'm still not sure what the best method is. The most informative thread I have found is this one. I like that method, as using MSI afterburner would allow me to have dynamic control over clocks (beyond what CCC allows), fan speed, and voltage, which I like a lot. I have heard, however, that using afterburner conflicts with CCC's powertune, but I don't understand how. Does it disable it completely, or does it just keep it locked at 0%? I'm mostly worried about whether a conflict with powertune could cause some kind of problem that could damage the card when it is OCed and has shaders unlocked.
post #2 of 6
From my experience, the only problem is that setting new clocks on MSI afterburner resets powertune in CCC. Without using powertune, core clock seems to fluctuate when monitored. Then again, I don't use +voltage. However, I think I managed to fix this by disabling ULPS in the registry.

I can't really speak to the possibility of long term damage to the card (I'm sure there is some), or to other's experiences, but my ref 6950 shader unlocked/ oc'd is still running fine after at least a few months of playing..
post #3 of 6
I had to put my core voltage up to 1250mv and the powertune in CCC up for my card to be stable.

I'd be weary though, there haven't been many success stories with the newer batches of the cards.
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post #4 of 6
Thread Starter 
Quote:
Originally Posted by justarealguy View Post
I had to put my core voltage up to 1250mv and the powertune in CCC up for my card to be stable.

I'd be weary though, there haven't been many success stories with the newer batches of the cards.
Just for the unlock to work, or for the OC to be stable? If you OCed it, what did you use?

I don't really care if the unlock doesn't work though. I wouldn't be buying 2 6950s if they didn't meat my needs stock. But it would be a nice bonus. The OC is more important to me however. I was also considering 2 XFX cards, which I would not try to unlock. I have already tested one and know how it runs, and XFX has nice warranties. The lifetime warranties aren't quite as attractive when you have 2 GPUs though. And they exhaust into the case, which might not be ideal for a multi-GPU setup (need to research this a bit).
post #5 of 6
Quote:
Originally Posted by gamadaya View Post
Just for the unlock to work, or for the OC to be stable? If you OCed it, what did you use?
The unlock would work at stock volts in 2d, 3d would obviously crash. In order for my 6970 bios to be stable I had to up the voltage to 1250mv and 20% in CCC.

I used MSI afterburner for voltage / overclocks



Quote:
Originally Posted by gamadaya View Post
I don't really care if the unlock doesn't work though. I wouldn't be buying 2 6950s if they didn't meat my needs stock. But it would be a nice bonus. The OC is more important to me however. I was also considering 2 XFX cards, which I would not try to unlock. I have already tested one and know how it runs, and XFX has nice warranties. The lifetime warranties aren't quite as attractive when you have 2 GPUs though. And they exhaust into the case, which might not be ideal for a multi-GPU setup (need to research this a bit).
Eh, it depends on your airflow. These puppies do run hot.
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post #6 of 6
Thread Starter 
Airflow would be a Fractal Design R3 with 3 extra Scythe Mugen fans I've had sitting around since like 2009. That's why I was considering something that exhausts into the case, even though I don't really like that method.

So MSI afterburner actually works with CCC now? I thought that it ignored any powertune changes.
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