I have a problem with this board too.
I tried to describe it in here: http://service.cid.foxconnchannel.com/econtact/online/onlineFeedback.init.do?selectCaseId=0496A3247F000001001B5DD73E815A51
We though it was a hardware problem so i sent it to our Rma and they helped me for no cost (@no warranty) They changed these things: IC,REALTEK,ALC888-GR,G,LQFP-48,SMD
And they changed bios beta bios to 07 bios. There is no same problem in these old bioses but there is no unlock potential more... And as everybody know 07 bios is a big problem on HT speeds 5x limit...
I changed my bios to latest beta bios and still problem as i desribed in online feedback before. So i changed my bios again to 080015 ( D series beta bios i dont know where i found it i forgot it )
I wish i can fix this issue.