So, I have a rig with 2 6850's in it. I have Windows 8 64bit, I have Catalyst 12.8 installed and the 2.6 SDK installed. When I open up catalyst and go to overdrive, only one card is showing up. I have both cards plugged into monitors. I am missing something here?
If both cards are detected and properly installed, you'll have to select which desktop (1 or 2) at the top of the Overdrive screen. It's a drop-down menu above the card information readout.