Realtek High Definition Audio Driver is a System Utilities software developed by Realtek Semiconductor Corp. After our trial and test, the software is proved to be official, secure and free. Here is the official description for Realtek High Definition Audio Driver:

Marydown Editor: Realtek High Definition Audio Driver (WHQL) for Windows Vista/7/8.

It supports following Realtek HD Audio Codes: ALC880, ALC882, ALC883, ALC885, ALC888, ALC861VC, ALC861VD, ALC660, ALC662, ALC260, ALC262, ALC267,ALC268,realtek ALC 888
HDMI Device WHQL Support: ATI HDMI Devices.