I also believe that amd hd cards uses realtek audio controller or at least similar driver software which are compatible and thats why you were able to change "amd hdmi output" to "realtek hdmi output.. Realtek is for the onboard high definition audio codec built onto the motherboard. it is what you use when simply using a desktop or laptop. amd is the audio driver for hdmi, for when you have a tv attached to the computer or desktop.. Realtek drivers download utility is a powerful utility which helps you download, update, backup and restore the realtek drivers installed on your windows pc. realtek drivers download utility automatically checks for more recent driver versions and identifies and installs missing drivers for unknown devices in your computer..
Now the realtek audio on the board is very good at audio and supports dts, dolby digital. currently the audio output is the amd hdmi output, and if xbmc tries to use dolby etc, the playback is extremely slow and choppy.. Download the latest realtek high definition audio driver and ati hdmi audio device driver from realtek <-click there to go to the realtek site - click the link that says "high definition audio codecs (software)" when you are in the downloads area on the realtek site - you will be choosing either 32bits vista, windows7, windows8, windows8.1. This document provides the answers to frequently asked questions about amd audio configuration and setup. examples include; where to get the amd high definition audio device driver, and how to enable and configure the amd high definition audio device..