Please specify ur system configuration as well ur video drivers version and the type of AGP card that u r using.As far as the GRAPHICS JARGON is concerned ,here r sum of the latest definitions....:
1.)
Anti Aliasing:This is the thechnique that removes jaggedness at the edges of an object.Since it eats up lots of GPU cycles,a higher setting will lower the frames per second that u can get.Most cards are set by default to the lowest setting of 2x, and the Application Performance option lets you define the setting from the game.
2.)
Anisotropic Filtering:This filtering technique when enabled lets you see distant objects clearly.An example is a straight road.With this setting enabled,you will be able to see the texture (like a brick road and its cracks) even at the farthest point clearly. Similar to Anti-Aliasing,the lowest setting is 2x and there is also the Application Preference option.A higher setting of say 8x will dramatically improve image quality but will also adversely affect the output frame per second.
........................source--->DIGIT MAG,June-2005,pg.150 
Well but i must warn u !! that wen u r playing a game then plz TURN OFF the
"Display the 3D logo" while playing any game coz that will completely erase sum/most of the graphics/videos while u r playing sum games like NHL or even FIFA, while sum other games will support it like UT (this is as per my experiences)
cheers n e-peace....mate..
Graphix setting
Linear Mode
