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Crossfiring between different card of the same series

post #1 of 16
Thread Starter 
Hey so after searching google a bit i'm wondering if what I read is true. If I were to crossfire between a 7970 and a 7950 would the 7970 work more like a 7950? And does the same go for different models between say a 6850 and a 6870? Is there an advantage to that or does it really just cost you more money?
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post #2 of 16
If you put two different cards of the same series in crossfireX/SLi, the faster card will perform like the slower one. So basically it's more like 2x(the slower one).
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post #3 of 16
yes it works higher card gets downclocked to lower card though I think is the only negative.
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post #4 of 16
Hi.


I know that you can Crossfire the 6850 with a 6870, so, maybe can works in the same way for the 7xxx series.

415
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post #5 of 16
Thread Starter 
Hmm ok then thanks for the info, would crossfiring it with a 7990 when it comes out be better than? On the chart it says you can with a 6990 and 6970, however does the extra core get shut off or does that equal tri-fire?
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post #6 of 16
Quote:
Originally Posted by Ruined View Post

Hmm ok then thanks for the info, would crossfiring it with a 7990 when it comes out be better than? On the chart it says you can with a 6990 and 6970, however does the extra core get shut off or does that equal tri-fire?

7990 will be much of 2x7970, so crossfiring it with another 7970 would be like 3x7970.
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post #7 of 16
Thread Starter 
Right on man thanks, it'll be a long time before I can afford that though, probably after the 8xxx series drops lol.
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post #8 of 16
guys i'm sorry but i think your wrong.

if you crossfire a 7970 and a 7950 each GPU will run at its own speed. this means for example if the 7970 runs at lets say at 1000/1200 and the 7950 runs at 900/1200 and you CF them together, that doesn't mean that the 7970 will run at 900/1200, but each GPU will run at its own clocks.

so the 7970 will run at 1000/1200 and the 7950 will run at 900/1200 even if they are CFed.
Edited by Fantasy - 2/24/12 at 10:56am
    
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post #9 of 16
Thread Starter 
Quote:
Originally Posted by Fantasy View Post

guys i'm sorry but i think your wrong.
if you crossfire a 7970 and a 7950 each GPU will run at its own speed. this means for example if the 7970 runs at lets say at 1000/1200 and the 7950 runs at 900/1200 and you CF them together, that doesn't mean that the 7970 will run at 900/1200, but each GPU will run at its own clocks.
so the 7970 will run at 1000/1200 and the 7950 will run at 900/1200 even if they are CFed.

Hmm anyone have a setup where they crossfired different cards together, if that's true I maybe joining crossfire sooner than I think biggrin.gif
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post #10 of 16
Quote:
Originally Posted by Ruined View Post

Hmm anyone have a setup where they crossfired different cards together, if that's true I maybe joining crossfire sooner than I think biggrin.gif

well look at my system. I'm CFing a 5970 and a 5870 together and each GPU run at different speeds.

5970 GPU 1 = 920/1200.
5970 GPU 2 = 900/1200.
5870 GPU = 865/1200.

if you would like I can show you prof from MSI After burner that each GPU runs at different speed regardless of what is the lowest GPU speed.
    
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