Doom3 + ATI X1950 Pro = Antialiasing maxi impossible

Antialiasing: Antialiasing is a method of smoothing the jaggedness of lines in 3D graphics. For more details see my Gamer's Graphics & Display Settings Guide. This setting has (up to) five options: Off, 2x, 4x, 8x and 16x. When set to Off, there is no additional Antialiasing used, unless you have forced Antialiasing enabled in your Graphics card's control panel. Antialiasing set to Off provides the fastest performance. When set to 2x Antialiasing, this uses your graphics card to smooth out jagged lines at the cost of some FPS. Higher levels of Antialiasing will reduce FPS even more, but smooth out jaggedness considerably, particularly for distant objects. Note that if you have any level of Antialiasing enabled in your graphics card control panel, they will override these settings. If you want to use Antialiasing in Doom 3 I recommend selecting 'Application Preference' (not '0x') in your graphics card's control panel and then setting the AA level in-game here. For most people however I recommend setting Antialiasing to Off since it is a major performance drain, and Doom 3 is a game which really doesn't require antialiasing at any resolution - the jaggedness of lines is barely noticeable.