The earlier revisions of nForce2 only officially supported 333 FSB, but the second revision officially supports 400 FSB. Some boards needed only a BIOS update to change from 333 to 400 FSB support.
The onboard audio is definately better than that 4-yr old SBlive. I think its compairable to the Audigy or Audigy2.
<A HREF="http://www.anandtech.com/mysystemrig.html?id=24106" target="_new">My System Rig</A>
<A HREF="http://service.futuremark.com/compare?2k3=535386" target="_new">3DMark03</A>