Dual-card setups can be problematic for a number of reasons, and getting them recognized by Windows is the first challenge. If CrossFireX/SLI isn’t an option you see in the software, ignore your motherboard’s color coding and move the second card to a different PCIe slot. Games are a different story, as the drivers have to include a profile for a certain game, benchmark, or application to allow both cards to function, so there is usually a bit of a wait after a game comes out for a compatible driver (EVGA uniquely offers temporary profiles for new games).
Assuming dual-card mode is enabled in the drivers, and the game has been out awhile, your SLI/CrossFireX bridge could be faulty, but that is rare. You can try forcing dual-card mode via the Catalyst Control Center or Nvidia Control Panel, but success is hit-or-miss when doing this.
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