According to the manual your mobo supports wired and optical SPDIF so one should work.
The wired is the RCA type connector, using coax cable.
The optical is an slightly irregular round-is socket which is usually blanked off by a removeable, square-shaped plastic post.
If the gfx card has an optical SPDIF then you'd need an optical cable (also knowns as Toslink) and this should plug right in.
I found some pictures that might help
click here - in fig 10 the plastic posts just pull out to expose the connector - I think the equivalent on your mobo is underneath the printer port.
I hope this helps :)