SPDIF Out

I need to get an SPDIF optical out from my HTPC directly to a Samsung Sound Bar, as using HDMI from the HTPC to my TV, then SPDIF from the TV to the Sound Bar only supports PCM.

The HTPC is a Streacom FC5 with a GA-Z77M-D3H fitted. The SPDIF out connectors on this particular motherboard consist of just two pins - GND and SPDIF_O, there is no +5v.

The motherboard manual states:

SPDIF_O (S/PDIF Out Header)
This header supports digital S/PDIF Out and connects a S/PDIF digital audio cable (provided by expansion
cards) for digital audio output from your motherboard to certain expansion cards like graphics cards and
sound cards. For example, some graphics cards may require you to use a S/PDIF digital audio cable for
digital audio output from your motherboard to your graphics card if you wish to connect an HDMI display
to the graphics card and have digital audio output from the HDMI display at the same time. For information
about connecting the S/PDIF digital audio cable, carefully read the manual for your expansion card.

I've already asked this question on the Gigabyte forums, but no one has replied in over a week, so I'm hoping someone on XBMC can help
Is it possible to use one of the Gigabyte SPDIF panels that come with a 3 pin block (SPDIF_O, GND and +5v) but connect the +5v to another +5v source, or will it not work without being fed into an additional video/sound card as mentioned?

If the above isn't possible, can someone please recommend a half height PCI-E sound card with SPDIF out that supports both Dolby Digital and DTS?

Cheers