Antialiasing question

BrandtP

Distinguished
Apr 7, 2002
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Quick one here: What is Antialiasing and what are the differences between 2x, 4x, 8x and 16x?

Okay, so one more: I'm assuming enabling FSAA is more taxing to the video card. Why would my Geforce 6800 get a higher FPS in the time demo using FSAA 4X than when it is disabled?