Just posting up the driver
I used for my onboard sound card. It's a 'soundmax' but I used the Realtek ALC650 driver: http://dlsvr01.asus.com/pub/ASUS/mis...50_wdma341.zip
It works fine outputting PCM via the s/pdif port but I've had no success outputting DTS or Dolby Digital.
In Windows XP I could run Intervideo WinDVD 4/6/7 and DTS / Dolby worked fine. All other software, even when using AC3 filter failed to output anything but stereo.
If anybody has any success with this please let me know.