I just got a new Rampage 3 Formula with the integrated SupremeFX X-Fi 2 soundcard.
I first installed the Realtek drivers in Win764, then installed the Creative drivers. I have sound, and the Realtek audio manager works fine, but when choosing any of the Creative applications (control panel, THX settings, etc) I get an error stating that "no compatible device found. Would you like to select a new one now?".
If I try to select another device, only the Realtek HD audio device is listed and it will not work.
I've un-installed and re-installed the drivers with the same issue.