I have been toying with Crossfire since launch, and I have finally found a fix that makes Crossfire work properly with this game. I have verified this with various benchmarks including Radeon Pro. In order to make Crossfire work with this game, you have to follow very careful instructions.
1. Download AMD Catalyst 13.11 Beta v 9.2
2. Install AMD Catalyst 13.11 Beta v 9.2 and reboot your PC
3. Download ULPS Configuration Utility 1.1.4 and run it to disable ULPS and reboot your PC to complete the process. This must be done AFTER installing Catalyst 13.11 Beta v 9.2
4. Open Call of Duty Ghosts, and go into the Video Advanced settings, and set the following settings:
Anti-Aliasing: Off (You will want to set AA here, but don't...We will get AA later, turn it off)
Anisotropic Filtering - High
Screen Space Ambient Occlusion - High
Sync Every Frame - Yes (this one must be set, its VSync pretty much)
Monitor Refresh Rate - Should be set to your monitor refresh rate...mine is 60 hz
Resolution - Whatever your Resolution is, mine is 1920X1080
Terrain - High
Depth of Field - yes
Distortion - yes
Image Quality - High
Textures - Manual, Set all Textures and Water Textures to High.
Save Settings and COD Ghosts will reload, now exit out of Cod Ghosts.
5. Open AMD Catalyst Control Center
6. Click Gaming and then Click 3d Application Settings.
7. Click the + Add Button and Navigate to C:\Program Files\Steam\Steamapps\Common\Call Of Duty Ghosts
8. Find iw6mp64_ship.exe and highlight it and click Open. With iw6mp64_ship.exe highlighted Click Save. You will be prompted to overwrite, just click yes.
9. Click the+ Add Buttonand Navigate toC:\Program Files\Steam\Steamapps\Common\Call Of Duty Ghosts
10. Find iw6sp64_ship.exe, highlight it, click Open and click save. You will be prompted to overwrite, just click yes.
11. Go to Catalyst Control Center. Click on Gaming and then 3d Application settings
12. Highlight iw6mp64_ship.exe and set the following settings in Catalyst Control Center:
Anti-Aliasing Mode: Use Application Settings
Anti-Aliasing Samples : Use Application Settings
Filter: Standard
Anti-Aliasing Method: Multisampling
Morphological Filtering: On (Here is our AA and it looks damn good in this game, it will slightly blur text on the game menu, but it makes the game itself look great with hardly any performance hit at all. AMD beefed MLA with Version 2.0 a few months ago with very little press, it performs 80% better in direct X 10-11 titles then the old version did while being much more accurate.)
Anisotropic Filtering: Override Application Settings
Anistropic Filtering Level: 16x
Surface Format Optimization: On
Texture Filtering Quality: High Qauality
Wait for Vertical Refresh: Always On
Tessellation: AMD Optimized
Maximum Tessellation: AMD Optimized
AMD Crossfire X:
Frame Pacing:On
AMD CrossfireX Mode: AMD Predefined Profile: Highlight iw5mp.exe
Click Save and your done with multiplayer, Close Catalyst Control Center.
For Single player, highlight the iw6sp64_ship.exe we created earlier, use the same settings you did for multiplayer except set the AMD CrossfireX Predefined Profile to iw5sp_Singleplayer.exe and click Save.
Now Crossfire X should work correctly. DO NOT enable ANY Anti-aliasing settings in game, Leave Vysync on in game and force it through Catalyst Control Center, Failure to do follow these instructions will result in texture flickering on guns and the environment that can make it look like strobe lights are going off in game, and terrible screen tearing.
My game now runs at a solid 60fps and never dips below 59, both of my HD 7850 2 GB cards are utilized around 50-65% a piece give or take 5%. Remember, AMD CrossfireX Scales at higher resolutions, at 1440P you may get more utilization, multiple monitors may get more utilization....don't expect your GPU's to be pegged at 99%, you don't want that...if the game only requires 50-60% of each to render a solid, smooth experience, then thats fine.
AMD Will be releasing another beta driver soon that will include a Crossfire Profile for Ghosts, when it releases, make sure you change the custom profile to the Ghosts profile, and run the ULPS disable tool after every driver update, because ULPS gets turned back on everytime you update your drivers.
this is the one game i have found where MLAA really shines, the game looks really goood, and it does a great job on foliage, trees, etc and for a very minimal performance hit, especially on HD 7000 series and newer cards that use GCN(Graphics Core Next)
Good luck hope this works for you, it works just fine for me...im utlitizing both of my cards in Crossfire games runs smooth as butter with a consistent 60 FPS where 2 days ago a single card was around 35-37....So i know for certain this has worked for me and worked for my cards, I hope it works for you until AMD releases a fix.