Crossfire not working with HD5870 11.4 catalyst driver upgraded from 11.3

[Guest]

Hello,
i have tried upgrading the ATI catalyst driver from 11.3 to 11.4, however crossfire stops working, and when running the windows performance test, the graphics card performance rating drop from 7.8 to 5.9. tried running 3dmark vantage with 11.4 driver, crossfire is clearly not working as the frame rate is around half what it would be in crossfire. reverting to 11.3 and crossfire works fine.

 

[bystander]

Try uninstalling the drivers and reinstalling them. Even a single 5870 will get a higher score than that.