What about the Bios update?
It seems the last one is 1303, although some people got back to 1302 and older due to some issues.
http://vip.asus.com/forum/view.aspx?id=20070217064414981&board_id=1&model=A8 N-SLI+Premium&page=1&SLanguage=en-us

Check the ASUS forum:
http://vip.asus.com/forum/topic.aspx?board_id=1&model=A8N-SLI+Premium&SLanguage=en-us

There seems to be manys problems with the onboard sound device, maybe there's a workaround for you.
http://vip.asus.com/forum/view.aspx?id=20080105065334656&board_id=1&model=A8 N-SLI+Premium&page=1&SLanguage=en-us


I don't know where I got it from but my bios is rev 1604, and the official sites have the 1603 as last beta, maybe there's a newer version for the premium hidden in the net.

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CPU: AMD Athlon 64 3000+ @2.3Ghz - Motherboard: ASUS A8N-SLI nForce4 SLI - nForceLAN by eno - SuperNForceATA by Medevil - RAM:2 GB DDR 333Mhz Audio: ALC850 Video: XFX nVidia GeForce 8400GS 256Mb (0x06e4) QE & CI from Chameleon 2 RC4Ethernet: Realtek RTL 8139 Series (working out of the box) OS: Snow Leopard 10.6.4 (aryajuanda's guide) + Windows XP 64bits