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6970+6950 unlocked cf?

post #1 of 7
Thread Starter 
So I have a new XFX 6970 I havent installed yet and I eventually plan on getting the 6990 for cor trifire action prob within a few weeks. As of right now I have an opportunity to get an XFX 6950 for basically free because I would get it in a trade. If I unlock it and CF the two cards how do you think the performance will be? Has anyone done this?
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post #2 of 7
I think the performance will be pretty good. Also with the new 11.4, isn't 2x 6970s CF would pull ahead of 580s in higher res?
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post #3 of 7
I have done this. I had a Sapphire 6970 and an XFX 6950 borrowed from a friend and unlocked it for him and Xfired the two cards and bought another sapphire 6970 and did a comparison and the unlocked shaders with the same 6970 clocks there was absolutely no difference, At all! not even 1 FPS. The only possible diff would be for overclocking.. due to the 2x 6 pin and the 6970 having 8 pin and 6 pin. But I had the XFX one overclocked to 950 and 1450 and 1175 volts and no problems and even without the voltage it was fine. Unless you need the 8 and 6 pin the two cards are identical. Side by side bare pcb to bare pcb they are identical... the 6970's pins and a phantom resistor set in the middle of the card are the only differences I know of. If I did not get an amazing deal on my 2 6970's I would have went 6950 and flashed 'er. Two 6970's pull ahead of 580's only in a few titles and Just Cause 2 being one of those for sure.
Edited by D4V3_1987 - 3/21/11 at 10:02am
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post #4 of 7
Thread Starter 
Thanks for the info D4v3. I really only heavy OC for benchies so 950 is great. Sounds like I will be getting a 6950 lol Now would you think it possible to add a 6990 to both of these for quad? 6990+6970+6950 unlocked?
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post #5 of 7
You need a butt load more CPU to push quadfire.
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post #6 of 7
Thread Starter 
I was able to run 2*5970 Quad for a short time with my 920 @ 4.4GHz. Not enough for this quad setup?
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post #7 of 7
OH LOL!!! I misunderstood your question a tad You want to do 3 way crossfire with 6990 and an unlocked 6950 (6970). I was just reading on another forum someone else who did this and it seemed to work out fine for him. I personally worry about ati's drivers when having an exotic configuration like that or even 2x6990's. I cant forget having issues with my past 2x 4870x2's.. Never got my moneys worth of performance out of them The drivers held it back. I thought they learned after having some issues with 3870x2 driver performance but I guess not. Ended up getting 3x GTX 280's and then 2x 470's for DX11. Anyways it shouldnt be a problem if the drivers dont give you any guff lol. Best of luck my friend Oh and I think your 920 at 4.2GHz will give them plent of hell. If there was any bottleneck it would be cpu related but in a minimal way. I would be more concerned with the drivers.
Edited by D4V3_1987 - 3/23/11 at 4:58am
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