Crossfire Radeon 6950 and 5770

[omid76]

Please if you could help me on this:
I bought a 6950 for battlefield 3 . so after a while I also added another 5770 to the working 6950, it seems that both cards are working fine so I expected some increase in fps for the game however I see no noticeable fps increase/change it is as was just working with the 6950! also will it make a difference to use 2 crossfire cables?

Thanks

AMD Phenom(tm) II X4 965 Processor 3.40Ghz
RAM 8GB

 

[DM186]

You can't crossfire the two cards at all they will opperate as single cards but not to gether so no increase in FPS. You need either a nother 6950 or a 5770 to crossfire it

 

[PurpleHayes]

Amd's CrossfireX technology only works with GPUs of the same family--for example, a 6850 and a 6870 can crossfire, but not a 6850 and a 5850. The first two digits have to match, so your 6950 can crossfire with a 6950/6970/6990, but nothing else, while the 5770 can only crossfire with a 5750/5770/5790.

When you successfully crossfire cards, the Catalyst Control Center should notice the crossfired cards and install appropriate crossfire drivers--that's one way to make sure it's successfully Crossfired.

*Edit: Derp about 5790

 

[nukemaster]

Yeah, what DM186 said.

PurpleHayes, I want a 5790 . The 5770 and 6770's can mix as well. they are the same card just re-badged.

The 5770 can only be xfired with a 5770 5750 6770 or 6750

The 6950 will work with another 6950, 6970 or 6990.

For best performance, you should use like cards.

http://www.tomshardware.com/forum/245454-33-crossfire-faqs

 

[omid76]

Disappointing fact!
Thank you for your answer