I currently have a HP p6774y desktop. I listen to alot of music on my computer. i have a set of logitech z623 2.1 speakers. I am currently using the mobo chipset. i was wondering if a sound card would improve sound while listening to music through my speakers? i have been looking at asus xonar dgx 5.1 and dsx 7.1. would either of these make a significant improvement in sound quality with music and movies? i dont game much at all. the chipset is a alc888. thank in advance.