Asus Crosshair II Formula - Manual (Page 46)

2-20 Chapter 2: Hardware information
2.5.3 Interrupt assignments
IRQ Priority Standard function
0 1 System Timer
1 2 Keyboard Controller
2 – Redirect to IRQ#9
4 12 Reserved
5 13 IRQ Holder for PCI Steering*
6 14 Floppy Disk Controller
7 15 NVIDIA nForce 780a SLI
8 3 System CMOS/Real Time Clock
9 4 IRQ Holder for PCI Steering*
10 5 IRQ Holder for PCI Steering*
11 6 IRQ Holder for PCI Steering*
12 7 Reserved
13 8 Numeric Data Processor
14 9 Primary IDE Channel
IRQ assignments for this motherboard
A B C D E F G H
PCIE x16_1 shared shared shared shared – – – –
PCIE x16_2 shared shared shared shared – – – –
PCIE x16_3 shared shared shared shared – – – –
USB 1.0 controller 1 – – – shared – – – –
USB 1.0 controller 2 – – – shared – – – –
USB 1.0 controller 3 – – – shared – – – –
USB 1.0 controller 4 – – – shared – – – –
USB 2.0 controller – – – shared – – – –
HD audio shared – – – – – – –
IEEE 1394 – – shared – – – – –