7950 CF with 7970?

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I follow what you're trying to say -- you're just wrong.

The 7970 operates as a 7970, the 7950 operates as a 7950. Each card draws every other frame. The net result will be about what crossfire 7950s would be, but the 7970 doesn't downclock or disable anything -- it just has to work less hard to draw its frame.
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hapkido

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Oct 14, 2011
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Neither.

If the 7950 is at 100% load, you'll probably see the 7970 working less hard since it's a faster card. Your net performance will probably be about CF 7950s, but the 7970 doesn't downclock or anything.
 
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bryonhowley

bryonhowley

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Oct 24, 2011
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At one time I had understood that a Crossfire like that would lower the clock speed to the slowest card but the drivers may have changed that I have been away from AMD for a few months so I can't say. But in either case it will still be a very good setup. I have a Crossfire HD 7950 in my FX-8120 rig and it is still very good.
 
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cookybiscuit

cookybiscuit

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Aug 31, 2012
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I'm not sure you follow.

The 7970 and 7950 are the same GPU, both variations of the Tahiti core. When you Crossfire a 7970 and 7950, the 7970 disables the cores it has extra to essentially make a 7950.
 
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hapkido

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Oct 14, 2011
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I follow what you're trying to say -- you're just wrong.

The 7970 operates as a 7970, the 7950 operates as a 7950. Each card draws every other frame. The net result will be about what crossfire 7950s would be, but the 7970 doesn't downclock or disable anything -- it just has to work less hard to draw its frame.
 
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