A Realtek liberou a versão 2.51 de seu "pacote" de drivers chamado HD Audio Driver. Abaixo chips suportados e link para download.

Driver Package R2.51
    Realtek HD Audio Driver support all of Realtek HD Audio Codec .

    1. Vista/Windows 7 WHQL Supporting: ALC882, ALC883, ALC885, ALC888, ALC889, ALC892, ALC861VD, ALC660, ALC662, ALC663, ALC665, ALC260, ALC262,ALC267, ALC268, ALC269, ALC270, ALC272, ALC273, ALC887,ALC670, ALC275, ALC680

    2. Windows 2000/XP WHQL Supporting: ALC880, ALC882, ALC883, ALC885, ALC888, ALC889, ALC892, ALC861VC, ALC861VD, ALC660, ALC662, ALC663, ALC665, ALC260, ALC262, ALC267,ALC268, ALC269, ALC270, ALC272, ALC273, ALC887,ALC670, ALC275, ALC680

    3. HDMI Device WHQL Support: ATI HDMI Devices

    4. OS Supporting: Microsoft WindowsXP, Widnows2000, Windows Server 2003, Vista, Windows Server 2008, Windows7 - x86/x64

    5. Pack with Microsoft High Definition Audio UAAV1.0a(5013)

    6. Add/Fix
        1.) Driver :
            1. Customizations.