3 interrupt assignments, 4 pci express x16 slot (x16 link), 5 pci express x8 slot (x8 link) – Asus Z9PA-U8 User Manual
Page 35: Interrupt assignments -15, Pci express x16 slot (x16 link) -15, Pci express x8 slot (x8 link) -15, Standard interrupt assignments
ASUS Z9PA-U8
2-15
* 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 x16 slot (x16 link)
The onboard PCIE4/6 slot provides one x16 Gen3 link to CPU1 and auto switches
to x8 link if PCIE3/5 is occupied. This slot supports VGA cards and various server
class high performance add-on cards.
2.5.5
PCI Express x8 slot (x8 link)
The onboard PCIE 3 and 5 slots provide one x8 Gen3 link to CPU1. These slots
support VGA Cards and various server class high performance add-on cards.