ok wait...
you just got the motherboard installed yesterday?
Did you re-install Windows? If not, that's your problem I think. Windows XP will operate ok on a base level when you swap motherboards, but most things will not work properly.
I swapped motherboards back when Dungeon Seige was new and I remember it played at about 8 FPS until I re-installed Windows fresh and used the proper drivers from the start. Then I was getting my max of 24FPS.
EDIT: And yes, the Audigy will be better. Disable the onboard sound and pop the card in before you do your format.
Edited, Sun May 16 22:41:51 2004 by CloakedStranger