Onboard sound stutters like mad

Just completed a new built that went well until I encountered a strange problem with the RealTek AC’97 on-board sound. I want to send digital audio out via the coax S/PDIF interface from the mobo to my home theater pre/pro. When playing basic digital audio files (MP3s or Windows Media files) that are encoded at low bit rates, this works fine. I get two-channel stereo, as one would expect.

But when I play a DVD (from the DVD drive) or video (from either the boot drive or the storage volume) encoded with AC3/Dolby 5.1, the sound stutters like mad. The video plays fine, and my pre/pro recognizes the audio signal as Dolby 5.1. But the audio stutters like crazy. I’ve tried everything I know to do. I have installed newer drivers from the RealTek site. I have tried alternative nVidia sound drivers. I have removed all PCI cards just to make sure, all to no avail. :?

Any help or advice is appreciated.

Here’s my setup:

A8N-SLI Premium (Socket 939), BIOS Revision 1009
AMD Athlon 64 X2 3800+ Toledo
Gigabyte nVidia GeForce 7600GT SilentPipe II
Corsair Twinx 2048-3200c2 (2GB, dual channel)
1 Seagate Barracuda SATA 3Gbs 160GB Drive on nVidia SATA Controller as boot drive
4 Western Digital Caviar WD4000YR 400GB drives on Sil3114 Controller for storage (RAID 5)
NetGear WG311T Wireless Ethernet adapter
WinXP MCE 2005 Update Rollup 2
3 answers Last reply
More about onboard sound stutters
  1. - Which program are you using to watch your DVDs?
    - Are you doing any overclocking? Try to return everything to stock.
  2. Quote:
    - Which program are you using to watch your DVDs?
    - Are you doing any overclocking? Try to return everything to stock.

    Using Video LAN Client, which is very reliable on many platforms.

    And thanks for asking about OCing; forgot to mention that I'm not doing any OCing. The only manual setting I made was for memory timings, per the Corsair test/spec sheet. Using their recommended timings and voltage settings (2-3-3-6/2.75v).

    I disabled as much as I could in BIOS, including the two wireline Ethernet controllers, QFan (using SpeedFan), etc.
  3. It seems like a codec problem... Try to install another AC3 codec, or try another program to watch your videos/movies/DVDs. :wink:
    Try this page: http://www.free-codecs.com/
    See if something solves your problem.
    Good luck! :D
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