I think he means AC97 (the 3.5mm computer audio outputs) and RCA (analog audio outputs). In either case, they pass the same analog signal; the only difference being the PC standard carries two speaker channels per connection.
^That's what I meant, sorry for the confusion
Best answer selected by Computerrock1.
Well a soundcard with RCA outputs is pretty rare, so it seems an unlikely first assumption to think that was an option he could use.
^^ A few high end cards use RCA over AC97. Its easy enough to convert back and forth, so thats really not a significant barrier in any case.