Originally posted by: Roguestar
Why would he notice a difference in gaming? (Not a flame, actually interested.)
When gaming, the major distinction between soundcards is not range, accuracy, etc., but the ability to artificially represent a three dimensional environment. The X-Fi cards that support "game mode" use another codec layer that makes them better "describe" the environment around the player character. It's all audio tricks, but with X-Fi game mode and the right positioning of speakers, the player can better determine the spatial relations using audio cues alone. All assuming the game uses the codec (lots of newer games already do)
ie: With onboard audio you can tell the enemy is in front or behind, since you can't see him, he must be behind you.
With SB Live! (EAX 1.0/2.0) you can tell he is behind you and moving slowly through water.
With SB Audigy (EAX 3.0/4.0) you can tell he is walking slowly through a puddle and carrying lots of weight because his footsteps are heavy.
With X-Fi (unofficially EAX 5.0) you can tell his is heavily encumbered walking slowly through a puddle five to seven feet behind you, with his rifle over his shoulder by the sling , unsheathing his knife (he's trying to sneak up on you from behind) while his buddy is another twenty feet back reloading his rifle so he can provide covering fire if things go bad for the guy with the knife.
That's way non-technical, and not entirely accurate, but is a good description of the difference. If you couldn't tell, I depend heavily on sound when gaming.