So to bitstream HD audio, do I need new motherboard or just videocard?

Hey guys new user, first post. Ive just recently tried to get into this media server thing. I tried plex and like it, and I know it all comes from XBMC originally, and since you have bitstream HD audio support, Id Like to try this route. I am new at this so bear with me. I know I might not hear a difference between audio tracks, but just knowing its there, and Im not using it, bugs me....

So I have a Windows PC that I built when win 7 came out, and I rip my Blu rays using MakeMKV. I do not have a separate video card on my PC just the one built into the motherboard which is a Gigabyte 785 ud2h with AMD Athlon II X4 630 Processor. I dont believe this has the capability to bitstream the HD audio formats, and just curious what I might need. A new motherboard?, or just an add on videocard.

Any help is appreciated...

Thanks,
Josh