Any feedback please?
Based on the Block diagram of the Technical product specification of this board, the IEEE-1394A (Fire wire) comes directly from the PCH-X79. You can see that information on the following link page 15.
Regarding the audio card you want to use, we have researched and no one has tested that device on our motherboards. So, you would need to contact the system manufacture to check if it is compatible with our product.