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ASUS A55BM-A/USB3
1-11
1.5.4 PCI Express x1 slot
This motherboard supports PCI Express 2.0 x1 network cards, SCSI cards, and other cards
that comply with the PCI Express specications.
1.5.5 PCI Express x16 slot
This motherboard supports one PCI Express 3.0/2.0 x16 graphics cards that comply with the
PCI Express specications.
IRQ assignments for this motherboard
A B C D E F G H
PCIEx16_1 – – shared – – – – –
PCIEx1_1 shared – – – – – – –
PCI1 slot
– – – – shared – – –
Realtek LAN controller
– – shared – - – – –
HD audio
shared – – – – – – –
SATA controller
– – – shared – – – –
On Chip USB EHCI 1/2/3
– shared – – – – – –
On Chip USB OHCI 1/2/3/4
– – shared – – – – –
1.6 Jumpers
Clear RTC RAM (3-pin CLRTC)
This jumper allows you to clear the Real Time Clock (RTC) RAM in CMOS. You can
clear the CMOS memory of date, time, and system setup parameters by erasing
the CMOS RTC RAM data. The onboard button cell battery powers the RAM data in
CMOS, which include system setup information such as system passwords.
A55BM-A/USB3
A55BM-A/USB3 Clear RTC RAM
1 2
2 3
Normal
(Default)
Clear RTC
CLRTC