C´est sur la faq du site officiel, je sais pas si ca peut t´aider:
http://www.jointopsthegame.com
Graphic Card / Video Issues
Q: I’m having display/graphics problems with my ATI Radeon video card. How can I fix them?
A: At the time of writing, there are a number of known issues with the Radeon 8500, 9000, and 9200 cards. Most can be fixed by installing the latest Catalyst drivers from the ATI website, version 4.5 or newer. Some of these issues are scheduled to be fixed with the Catalyst 4.7 drivers, which will be released shortly after the Joint Operations initial retail release date. If this doesn’t help, setting shadows to “Off” in the Options menu might also fix these issues.
Q: I get a black screen when using my ATI Radeon 9800 video card. How can I fix this?
Answer: There is a known issue with the ATI Radeon 9800 where the use of full scene anti-aliasing cannot be used in conjunction with frame effects set to “high”. Either setting alone is acceptable but not together.
Q: How should I configure my video options?
Answer: The easiest way to configure your video settings in the options menu is to make use of the “Default” “Performance” and “Quality” selections on the options menu. These will configure your video settings to pre-arranged levels based on your system performance. The " Default" settings are the recommended settings that the game chooses after the initial video test, " Performance" settings are optimized for fast and fluid game play, and " Quality" settings sacrifice some performance for higher quality graphics.
You can use each of the individual settings to fine tune your performance levels to optimize game play. Keep in mind when changing settings that resolution, anti-aliasing, texture filtering and frame effects tend to affect performance most drastically than the other video settings. Should you have performance issues, these are the settings you should try lowering first.
