I'm looking on my Mobo user manual, and it doesn't seem like they have that thing to connect to the graphics card.
My mobo does have an SPDIF optical though.
EDIT - Yeah... My mobo nor my 8800GT has the SPDIF. I think I have to connect the video via DVI to HDMI, and audio with toslink via SPDIF optical out.
I don't plan on playing much games with my PC on the TV, especially since the TV will have a higher resolution.