Gigabyte GA-8IDX3 Series User Manual page 49

PCI3 IRQ Assignment
Auto
3,4,5,7,9.,10,11,12,15
PCI4 IRQ Assignment
Auto
3,4,5,7,9.,10,11,12,15
Auto assign IRQ to PCI 3. (Default value)
Set 3,4,5,7,9,10,11,12,15 to PCI3.
Auto assign IRQ to PCI 4. (Default value)
Set 3,4,5,7,9,10,11,12,15 to PCI3.
4 5
BIOS Setup