Specifications

1-10

Chapter 1: Product introduction

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specications.

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specications.

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 – – – –

OnChipUSBEHCI1/2/3

– shared – – – – – –

OnChipUSBOHCI1/2/3/4 – – shared – – – – –

OnChipXHCIcontroller

– –

shared

– – – – –

1.6 Headers

Clear RTC RAM (2-pin CLRTC)

Thisheader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.

A68HM-E

A68HM-E Clear RTC RAM

CLRTC

+3V_BAT

GND

PIN 1

E9808_A68HM Series_Manual.indb 10 2014/10/16 10:09:02