I'd go with Realtek HD driver 1.89 from here http://www.realtek.com.tw/downloads/...&GetDown=false

Both the 3.1 and the 5.1 verions of the board use an ALC883 HD-audio chip. The other driver is for AC97 onboard (3.9x/4.0x driver versions) - the apperance of this one in the list for the board would seem to be a mistake