Please pay attention to topic "wording" whereas many don't and misinterpet the thread, causing following replies stay into another catagory that is totally unrelated.
The thread is HDMI SOUND out FROM video card TO TV/Monitor.
Somehow got into DVI sound OUT from video card but I went with it.
You say HCMI sound output supports 8 channels or 7.1 dolby.
Looking at "Speakers" or "HDMI' tab?
HDMI may support it but I believe truely won't use it without 8 speakers.
That is dependant on your "TV/Monitor" (2-speakers) output not the "SPEAKER" (5 computer outputs). IE: 1 channel per speaker = 2 channels is STEREO, 6 channels is Dolby 5.1 and 8 channnels is Dolby 7.1. If find any information that says different. Please post link here.
The TV/Monitor may support "virtual surround output" in the settings but that is not true Dolby 7.1 on TV/monitor.
If you have a TV/Monitor with with more than 2 speakers or sound out plugs, please post the Make&Model here.
I would be very interested in this TV/Monitor without requiring full home stereo center to get 8 channels.
LOOK at the HDMI/Digital output settings in the computer control center not the "speaker" output.
The "speaker" control center is for the "computer sound card output" ONLY, not the "HDMI Video sound output".
"VIA HD Audio Deck' = VIA sound card or "RealTek Audio Deck" = RealTek sound card.
If useing Sound Blaster look at the similar card controller panel. No HDMI tab = no driver installed.
HDMI Sound chip is built onto the Video Card and is NOT controlled by the computer"speaker" output and requires a seperate driver than the sound card driver. If your sound control center does not show a HDMI/Digital tab then the HDMI drivers are not installed.
Have found over 20 forum posts supprting this information( search = hdmi sound only 2 channels )
More searches: "does dvi transmit audio"
Now, DVI was supposed to carry sound but does not as intended. If you have different Info - post a link here.
http://www.tomshardware.com/answers/id-1668092/dvi-hdmi-sound.html
Read further down for updated DVI cable types. Cable Manufacturers.
http://mycablemart.com/help/pc_to_tv.php
Maybe nVidia has a video card that will when useing a DVI to HDMI cable - NOT - HDMI to DVI
please post link to card here for others to see. I will search and post here also.
Found nVidia shows DVI sound out using 24+1 or 24+5 which is the connector on the video card.
BUT, the support dept. needs to update thier info to match this feature, they keep refering back to using the video card HDMI video or SPDIF connector for sound when asked "DVI sound", and the pictures show the 18pin DVI which will NOT plug into the 24pin connector. (condensed from 6 hours of searching). nVidia suggests the GeForce 600 series for DVI sound - BUT - have to look for yourself, too much confusing, misdirected and double talk for posting. (Ex: Video DVI does this but this is needed (with wrong pics} but recommend using HDMI connection.)
I need to test that on my HD ATI Video card. I went straight Video HDMI to TV HDMI.
Have 18pin DVI cables, need to get 24pin DVI-D cables to test for audio.
DVI does produce near HDMI picture quality. If video has HDMI port - USE IT.
I have no Knowledge of any "special" "DVI Video Card" "Manufacturer Cables" that are video specific. I have Acer, HP, Compaq and Dell DVI video cables that came with the monitors, none of which transmit sound. I have never gotten a video cable with a video card nor, if look at package contents, does it list one. If you find a link to any "special" DVI cables, Please post here.
OK, DVI is no longer a legit description.
DVI = 18pin NO Audio ------ DVI-D = 24pin has Audio?
With technology advancing you MUST specify components properly, general descriptons do not get it anymore.
Example: there are 5 different cables, DVI 1=18pin, 1=22pin and new DVI-D 24pin, DVI-I = 28pin.
So check the video card for the +4pin ( :: ) before getting one.
http://mycablemart.com/store/cart.php?m=product_list&c=53
That is not counting the Apple/Mac versions.
NOT being argumentive and will post any links I find supporting what I post.
I research before speaking or I do not post. If having any questions, tried to cover everything concerning this issue, post it and willl try to help.
BTW: Been doing computer Build/Repair since 1983
Any links above are for information ONLY - No affiliates to sales.
Will update when I can and as new information is found.
Good Luck and Happy Computing.