The manual for this board is sad really. Lots of information missing or incorrect, like the FSB jumper settings. I also found that it was completely useless for Win98SE configurations, which always eventually resulted inBSODs. The sound components are the most annoying and the source of most of my headaches. I never could get surround to work with analog speakers. The rears just wouldn't work. I finally got a good and stable configuration with the latest unified drivers from NVIDIA and the driver updates from Windows Update on top of that.
BTW, here's a BIOS tip: Keep the Dolby encoder enabled even if you aren't using the S/PDIF connector. If it's disabled, the NVIDIA APU control panel may either not open or crash the system.