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Chapter 1: Product introduction
1.5.3 PCI Express 2.0 x1 slots
This motherboard supports PCI Express x1 network cards, SCSI cards, and other cards that
comply with the PCI Express specications.
1.5.4 PCI Express x16 slot
This motherboard has a PCI Express x16 slot that supports PCI Express x16 graphic cards
complying with the PCI Express specications.
1.5.3 PCI slots
The PCI slot supports cards such as a LAN card, SCSI card, USB card, and other cards that
comply with PCI specications.
1.6 Jumpers
1. 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.
IRQ assignments for this motherboard
H81M-C
H81M-C Clear RTC RAM
1 2 2 3
Normal
(Default)
Clear RTC
CLRTC
A B C D E F G H
LAN
– – shared – – – – –
PCIE x16_1
shared – – – – – – –
PCIE x1_1
– – shared – – – – –
PCIE x1_2
– – – shared – – – –
PCIE x1_3
shared – – – – – – –
Intel PCH SATA Controller
– – – shared – – – –
HD Audio
– – – – – – shared –
USB2.0_1
– – – – – – – shared
USB2.0_2
– – – – shared – – –
USB3.0
– – – – – shared – –
To erase the RTC RAM:
1. Turn OFF the computer and unplug the power cord.