Thanks very much to those of you that posted your specs and issues with ATI cards in FIFA 11. The below may assist you in resolving the issue. Please note that we do not recommend that you mess with the rna.ini file but this may 'unofficially' help you.
**IMPORTANT** This is only for ATI / AMD users who are already seeing the game at 60fps in game play (with V-sync on) but still see stuttering. This will NOT simply improve your framerate.
Step 1:
Open the rna.ini file. If you do not have this file, you can create it by opening a txt file and renaming it as rna.ini . You will need to place it in the same directory as where the fifa.exe exists.