PC Sound Card with Doby 7.1 3.5mm stereo jacks - How to convert to HDMI input for a Samsung Home Theatre system ?

I am trying to hook up a computer with a new Dolby 7.1 sound card to a new Samsung home theatre syste that only has HDMI inputs.

The problem is the sound card only has 4 x 3.5 mmm stereo jacks as output.

How do I do this ?  Is it possible to convert a sound cards output cables to HDMI ?

Analog Output
4 x 3.5 mm jack (1/8") (Front out/Side out/Center-Subwoofer out/Rear out)
Analog Input
1 x 3.5 mm jack (1/8") (Line-in/ Mic-in combo)
1 x S/PDIF out (1 x Optical (Toslink)/(combo with rear out))
1 x Front-Panel Header
1 x Aux-in (4-pin header)

Sound card :
Asus Xonar DSX PCI Express 7.1-channel audio card

Samsung Home Theatre System:
Michael GreenSenior IT Consultant / IT Project ManagerAsked:
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☠ MASQ ☠Commented:
It's a nice audio card but not really designed for what you have in mind.

What's your graphics output?  Your best way of doing this would be to have a graphics card with HDMI out and also S/PDIF in and then connect the S/PDIF output from the Xonar to the input of your graphics card.  That would allow the Xonar to stream the 7.1 audio direcly into the HDMI feed to the TV.

If your graphics card doesn't support S/PDIF input this is going to be like hammering a square peg to fit a round hole :(

And S/PDIF is 2 channel only! http://www.hardocp.com/article/2012/07/09/asus_dgx_dsx_xonar_rog_phoebus_sound_cards/3#.VcCUK_n9VcA
Michael GreenSenior IT Consultant / IT Project ManagerAuthor Commented:
This is the graphics card the PC has it in :
Gainward GeForce® GTX 980

Unfortunately the Gainward documentation is so bad that I can see if the card has a S/PDIF input......
John TsioumprisSoftware & Systems EngineerCommented:
Which is you motherboard?
I am afraid you need a sound card with optical S/PDIF output like this Creative
☠ MASQ ☠Commented:
I see what you mean - their Quick Install Guide isn't much help either!

I guess just eyeball the card and see if you can see an S/PDIF socket, I've just taken this picture off a GX285 I have nearby as an example, you're looking for the small two pin socket indicated by the arrow but it could be any where on the card or even two pins covered by a jumper on the PCB.  Also (because life is like this ... ) look for S/PDIF printed on the board!

S/PDIF socket on nVidia card
Again, even if we get this hooked up it's only going to produce 2.0 stereo audio via S/PDIF you won't get 7.1 from your card through the HDMI.  Is this an acceptable alternative?

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