The difference is that the onboard sound uses a lot more of the CPU power, and is generally crappy sound quality.
In other words, most onboard sound sucks as much as the Live.
Now, there is a C-Media 6-channel chip, as well as the nForce sound, both of which are pretty good quality.
<font color=orange>Quarter</font color=orange> <font color=blue>Pounder</font color=blue> <font color=orange>Inside</font color=orange>
Don't step in the sarcasm!