I am currently running on board sound with optical out to my receiver. I am suspicious that the on board sound may be limited (even though Asus advertises it as being great). My motherboard is an Asus P8z77v-pro and my old sound card is an Audigy2 (ca0102-ict). The Asus supposedly does 7.1 surround with DTS. I only need 5.1 but I do want DTS or Dolby encoding. Will I hear better digital 5.1 out of my mobo or my ancient sound card?