Ok stealing a couple hours at night while the company was at their hotel, I installed Windows 7, loaded the Zotac drivers from the provided disc and then loaded XBMC Windows 10.1. You have to turn video acceleration on within both Catalyst and XBMC. You also must switch to HDMI and indicate you have a DTS and Dolby receiver, if you do, in XBMC. Finally from sound in Control Panel, you must right click on the AMD HD audio and select speaker configuration to 5.1 or 7.1. At this point for Dolby True HD, the PCM 7.1 indicator is lighting up. For DTS HD MA, just DTS indicators. I think I will have to look into ffdshow.
Also, on a really odd note, originally I had a WD HD hooked up and played a Dolby Digital test mkv, ya know, the ones that play sound through each of the 7.1 speakers. During this process, my receiver indicated TrueHD and the sounds from each speaker were accurate. Then, without messing with my speakers, I hooked up the AD10, and now my receiver indicates PCM 7.1, which is fine for the moment, the windows speaker 7.1 test is still accurate. As soon as I launch XBMC and play the same Dolby Digital test mkv, my surround and rear speakers are reversed. Can't for the life of me figure out why, or find somewhere where I can flip surround and rear.
Now I have not really had a chance to tweak the AD10, but when playing 1080p DTS5.1/Dolby5.1, 10-20GB MKVs in XBMC with stats on, CPU sits at about 15% and occasionally tops out at 30%. Just after starting the movie skipped frames shows 2-4, but does not move for the remainder of the movie. Upon visual inspection, in panning shots, I see little jumps, but I have not tested with the XBMC settings to do with matching FPS turned on.
Even with the issues I am experiencing, my modded XBox with XBMC and my WD HD Live sitting on the shelf are looking very scared.