3 interrupt assignments, 4 pci express x8 slots (x4 link), 5 pci express x16 slot (x16 link) – Asus P8B-M User Manual
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2-18
Chapter 2: Hardware information
* These IRQs are usually available for ISA or PCI devices.
IRQ
Priority Standard function
0
1
System Timer
1
2
Keyboard Controller
2
-
Programmable Interrupt
3*
11
Communications Port (COM2)
4*
12
Communications Port (COM1)
5*
13
--
6
14
Floppy Disk Controller
7*
15
--
8
3
System CMOS/Real Time Clock
9*
4
ACPI Mode when used
10*
5
IRQ Holder for PCI Steering
11*
6
IRQ Holder for PCI Steering
12*
7
PS/2 Compatible Mouse Port
13
8
Numeric Data Processor
14*
9
Primary IDE Channel
15*
10
Secondary IDE Channel
2.5.3
Interrupt assignments
Standard Interrupt assignments
2.5.4
PCI Express x8 slots (x4 link)
The onboard PCI Express x8 slots provide two x4 link to CPU. The slots support
VGA cards and various server class high performance add-on cards.
2.5.5
PCI Express x16 slot (x16 link)
The onboard PCI Express x16 slot provides one x16 link to CPU. This slot supports
VGA cards and various server class high performance add-on cards.
2.5.6
PCI slot
The PCI slot supports cards such as a LAN card, USB card, and other cards that
comply with PCI 2.3 specifications.