I have an A7V and Sound Blaster Live 5.1 Platinum. In the beginning I experienced all kinds of problems, mostly due to IRQ-conflicts and bad drivers. Mostly my problems were connected with the graphic card Asus V7700 Deluxe.
Anyway, this is how I solved my problems (I think ? the computer has been rock stable for two days now and no of the ?old? problems have come back)
I put my cards in this order
PCI1 / AGP Asus V7700 Deluxe IRQ9 (assigned in BIOS and reserved to legacy drive)
PCI2 empty
PCI3 Sound Blaster? IRQ5 (assigned in BIOS and reserved to legacy drive)
PCI4 Network card
PCI5 Empty
Then I did my seventh hard install from scratch ? I know, it takes time and data will be lost, but fortunately I had backups on my important files. Then I installed my drivers in this order.
1. Via 4in1 (sorry don?t remember the version)
2. Drivers for graphic
3. Driver for Sound Blaster
In System turn of the Sound blaster Emulation since it wants to use one IRQ. You don?t need it, unless you play DOS games. Also in System, let BIOS handle IRQ, not Windows. (I think this is found under properties for the PCI-bus. Sorry, if I don't make sence.
Anyhow, I have not experienced any problems with the onboard audio/modem device turn on auto. I am not sure if the mobo has onboard sound. Actually I don?t think so. But turn it off anyway.
I hope that this will help you!
Good luck!