Some articles on fi xtreme audio, fi:
Sound Blaster X-Fi - X-Fi Line-up - X-Fi Xtreme Audio
... The entry-level model of the X-Fi series, the Sound Blaster X-Fi Xtreme Audio, does not actually have the EMU20K1 chip but is a re-branded Audigy SE ... Thus, not only is all of the X-Fi–related processing performed in software, but it also lacks basic hardware acceleration just like the SB Live! 24-bit, the Audigy SE and other budget ... The X-Fi Xtreme Audio does not use the same drivers as the rest of the X-Fi family (and lacks ASIO), some games do not recognize it as being "X-Fi capable hardware", and the device's hardware profile ...
... The entry-level model of the X-Fi series, the Sound Blaster X-Fi Xtreme Audio, does not actually have the EMU20K1 chip but is a re-branded Audigy SE ... Thus, not only is all of the X-Fi–related processing performed in software, but it also lacks basic hardware acceleration just like the SB Live! 24-bit, the Audigy SE and other budget ... The X-Fi Xtreme Audio does not use the same drivers as the rest of the X-Fi family (and lacks ASIO), some games do not recognize it as being "X-Fi capable hardware", and the device's hardware profile ...