Is it worth replacing an "Xtreme Gamer" for an Xonar D2X?
Not really, but it depends what the main use for your X-Fi is, gaming or music? Also depends on what speakers you have, analogue or digital. D2X has features which may be of no use to you. If you have no speakers that have digital connection, DTS is of no use to you. Optical will be of no use either, unless plan to create or record music from a digital source. Music creation software also comes with it, which again may be of no use.
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