Nforce 5 HD Audio is an Azalia thang
 

Nforce 5 and MCP04 chipset will end up with HD audio, Azalia audio, nothing more. Sound wise Nvidia won't offer anything better than Intel, ATI and ULI some of the Azalia supporters. Azalia is good but it's still not enough to cope with Sound Storm.

http://www.theinquirer.net/?article=20211