Man tai atrodo marketinginis ejimas is ATI puses nedarasant. Ka jie raso ju 
tinklalapyje specifikacijose:
ATI HD4850/4870 serijos - Integrated HD audio controller with support for 
stereo and multi-channel (up to 7.1) audio formats, including AC-3, AAC, 
DTS, DTS-HD & Dolby True-HD, enabling a plug-and-play audio solution over 
HDMI (perdavimo greitis ribojamas iki 6,144 Mbps)
ATI HD4830 jau ras kitaip :) - Integrated HD audio controller with support 
for stereo and multi-channel (up to 7.1) audio formats, including AC-3, AAC, 
DTS, enabling a plug-and-play audio solution over HDMI (pastabose nurodytas 
perdavimo greitis ribojamas iki 6,144 Mbps)
ATI HD6xxx serijos  raso dar kitaip :) - Integrated HD audio controller with 
support for stereo and multi-channel (up to 7.1) audio formats, including 
PCM, AC-3, AAC, and DTS, enabling a plug-and-play cable-less audio solution 
over DisplayPort (or HDMI depending on section)

Jei nepalaikytu minimu garso formatu, kam tada diegti HD audio valdikli. 
Manau, kad viskas ok su HD46xx serija, nes internete pilna papildomos info 
apie tai:
http://www.avsforum.com/avs-vb/showthread.php?t=1029603
http://www.hardwarecanucks.com/forum/hardware-canucks-reviews/9987-ati-hd-4670-512mb-gddr3-video-card-review-4.html
http://www.avforums.com/forums/home-cinema-pcs/843173-my-cake-eat-htpc-questions.html

Ir dar viena idomu straipsneli aptikau, beieskodamas, visai neseniai. 
http://www.anandtech.com/video/showdoc.aspx?i=3411

Trumpai, jei reikia beveik teisingo HD garso palaikymo, tada
- Whew. There you go, that's what all of this 8-channel LPCM talk is all 
about. It's supported on NVIDIA's GeForce 8200/8300 chipsets, Intel's 
G965/G35/G45, and AMD's Radeon HD 4800 and 4600 series. Done. Kazkaip 
nezinojau, pasirodo ir Intel bei Nvidia kai kurie  chipsetai tai palaiko.

Jei reikia tikro HD garso palaikymo, tada:
- ASUS Xnorar HDAV1.3
- Auzentech  X-Fi HomeTheater HD. Sita man patrauklesne. X-Fi garso 
prcesorius = geras suderinamumas su zaidimais. Taip pat, pagal mane geresnis 
tvarkykliu leidimas, nei ASUS atveju.

> Nerandu niekur, kad butu parasyta, kad HD45xx/HD46xx palaiko DTS HD garso 
> takeli.
>
> Pagal mane DTS-HD & Dolby True-HD palaikyma turi tik HD4850 ir HD4870
>