Hi niaosuan
When i first setup my system i just select UserDSDT or DSDT-free option, I don't need a DSDT for this board. This sets up the system with standard options as a MacPro3,1. Once booting of the hard drive, I then install the sound kext from MultiBeast.
I have added a copy of my boot plist for you to have a look at. I also ran this card on a gigabyte GA-ph67A-ud3-b3 board with the appropriate DSDT from the download section, and again all was well.
I hope this helps.
BMW