Tracker
Enthusiast
A Sound Card will allow you to play with the levels and tweak things alot more easily, but when playing games the difference won't be substantial, the quality of your speakers will be far more important as most onboard sound is well up to the demands of mp3's, movies and modern games, unless you're intending to setup a 7.1 surround sound system or you're an audiophile who likes to tweak sound levels and such about alot then the onboard sound will be more than adequate.