1.8.2 Configuring an expansion card Asus prime Asus M3A78

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ASUS M3A78

1-21

A

B

C

D

E

F

G

H

PCIEX1 Slot1

shared

PCIEX1 Slot2

shared

PCIEx16 Slot

shared –

Onboard USB1.1 Controller 1 shared

Onboard USB1.1 Controller 2

Onboard USB1.1 Controller 3

shared –

Onboard USB1.1 Controller 4

Onboard USB1.1 Controller 5

shared –

Onboard USB2.0 Controller 1

Onboard USB2.0 Controller 2

Onboard ATI RS780 AZALIA

Onboard IDE  PORT

shared

Onboard HD Audio

shared

Onboard LAN

shared –

Onchip SATA

shared

PCI Card1

– shared

PCI Card2

shared

PCI Card3

shared

When using PCI cards on shared slots, ensure that the drivers support “Share 

IRQ” or that the cards do not need IRQ assignments; otherwise, conflicts will 

arise between the two PCI groups, making the system unstable and the card 

inoperable.

IRQ assignments for this motherboard