Here is what steps I followed to setup the dual graphics:
- With the 6670 not plugged in I've setup in BIOS: - Init Display First to Onboard
- Installed the latest AMD Catalyst (12.8)
- Plugged in the discreet card and put monitor cable from onbord DVI to the dedicated DVI
- Enabled in Catalys the AMD Dual Graphics option (there is no Crossfire option only this one)
- Setup in BIOS UMA Frame Buffer Size to 1024MB
A screenshot of the Catalyst after this steps were done:
As you can see there is no crossfire box because it's the latest driver. Could this be the problem?