my asus maximas mobo has a built in SupremeFX X-Fi 2 sound card and I have another computer with asus p7p55-lx motherboard which has generic 7.1 channel onboard sound. My speakers are bit old and not too fancy logitech x530 5.1 channel. Now I had myself and a mate of mine while comparing the audio quality of these boards. To be honest, the supreme fx made little to no difference while gaming/ playing random video clips. However, while playing music, it was noticeably better- much better bass and much clearer audio quality on the maximas rig. I guess the bass can be adjusted manually but the clearer audio quality is definitely a plus of the supreme fx. We tried different techno musics and rnbs and in every case, the discrete sound card did better. The audio was more lifelike and the difference was definitely noticeable.