I had nothing but BSOD (IRQL_NOT_LESS_OR_EQUAL) with my Asus Xonar DX drivers (cmudaxp.sys file) and the 902 beta BIOS. The Xonar DX was in the bottom most slot.

I did a force flash back to 703 and no more BSOD. This was on WinXP64.

Just my 2c.