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Some expansion cards need an IRQ to operate. Generally, an IRQ must exclusively assign
to one use. In a standard design, there are 16 IRQs available but most of them are already in
use.
Standard Interrupt Assignments
IRQ
Priority
0
1
2
3 *
4 *
5 *
6 *
7 *
8
9 *
10 *
11 *
12 *
13
14 *
15 *
* These IRQs are usually available for ISA or PCI devices.
2-5-3 Interrupt Request Table For This Motherboard
Interrupt request are shared as shown the table below:
Slot 1
Slot 2
Slot 3
Onboard USB 2
Onboard USB 3
HD Audio
IMPORTANT!
2-5-4 PCI Express Slot
The motherboard series offer one 16-LANE PCI-Express x16 graphics slot of 4Gbyte/sec data
transfer rate at each relative direction which get 3.5 times of bandwidth more than AGP8X
and it's up to a peak concurrent bandwidth of 8Gbyte/sec at full speed to guarantee the
performance and compatibility of GPU graphics add-in cards. The whole series carry three
32-bit PCI slots guarantee the rich connectivity for the I/O peripheral devices. One PCI
Express x1 I/O slots offer 512Mbyte/sec concurrently bandwidth which is over 3.5 times than
32-bit PCI at 133Mbye/sec.
N/A
System Timer
N/A
Keyboard Controller
N/A
Programmable Interrupt
8
Communications Port (COM2)
9
Communications Port (COM1)
6
Sound Card (sometimes LPT2)
11
Floppy Disk Controller
7
Printer Port (LPT1)
N/A
System CMOS/Real Time Clock
10
ACPI Mode when enabled
3
IRQ Holder for PCI Steering
2
IRQ Holder for PCI Steering
4
PS/2 Compatible Mouse Port
N/A
Numeric Data Processor
5
Primary IDE Channel
1
Secondary IDE Channel
INT A
INT B
√
√
If using PCI cards on shared slots, make sure that the drivers support "Shared IRQ" or
that the cards don't need IRQ assignments. Conflicts will arise between the two PCI
groups that will make the system unstable or cards inoperable.
Standard function
INT C
INT D
INT E
√
√
√
√
14
INT F
INT G
INT H
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