Amd Dual Graphics Crossfire x Bad performance

[xxJANGO666xx]

When i enable Crossfire with my Amd Hd GDDR5 6670 and my 6550D All my games perform worse than if i just used the 6670 GDDR5. Is it because it's GDDR5? Or am i doing something wrong?

 

[dudewitbow]

same games can act badly when you use any form of hybrid crossfire/crossfire/sli. its called negative crossfire scaling i think

 

[Ohmybad]

i don't think you can crossfire those together... at least if you did it would clock the 6670 to the 6550 speeds... you need identical cards to crossfire.

 

[claysm]

i don't think you can crossfire those together... at least if you did it would clock the 6670 to the 6550 speeds... you need identical cards to crossfire.

As long as the cards share the same GPU, they can be used in Crossfire. For example, you can Crossfire a 6850 with a 6870 since they both use the Barts GPU. Likewise, since the 6670 and the 6550D both use the Turks GPU, they can be Crossfired.

As far as the poor scaling, dudewitbow is right, some games just won't do very well with it.

 

[xxJANGO666xx]

NO i was told from alot of people that u can crossfire the amd a8 series gpu with a 6450, 6570, or a 6670. And my computer shows the option for dual graphics and i enable it, but it makes performance worse