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System memory

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3. Align the other end of the retention bracket to the retention module base. A clicking sound denotes that the retention bracket is in place. Ensure that the fan and heatsink assembly perfectly fits the retention mechanism module base, otherwise you cannot snap the retention bracket in place. 4. Push down the retention bracket lock on the retention mechanism to secure the heatsink and fan to the module base. 5. When the fan and heatsink assembly is in place, connect the CPU fan cable to the connector on the motherboard labeled CPU_FAN. DO NOT forget to connect the CPU fan connector! Hardware monitoring errors can occur if you fail to plug this connector. 1.7 System memory 1.7.1 Overview The motherboard comes with four Double Data Rate 2 (DDR2) Dual Inline Memory Modules (DIMM) sockets. A DDR2 module has the same physical dimensions as a DDR DIMM but has a 240-pin footprint compared to the 184-pin DDR DIMM. DDR2 DIMMs are notched differently to prevent installation on a DDR DIMM socket. The figure illustrates the location of the DDR2 DIMM sockets: DIMM_A1 DIMM_B1 DIMM_A2 DIMM_B2 Channel Channel A Channel B Sockets DIMM_A1 and DIMM_A2 DIMM_B1 and DIMM_B2 M4A77D M4A77D 240-pin DDR2 DIMM sockets ASUS M4A77D 1-11

Section	Page
Notices	6
Safety information	7
About this guide	7
M4A77D specifications summary	9
Product introduction	11
1.1 Welcome!	11
1.2 Package contents	11
1.3 Special features	11
1.3.1 Product highlights	11
1.3.2 Innovative ASUS features	13
1.4 Before you proceed	15
1.5 Motherboard overview	16
1.5.1 Placement direction	16
1.5.2 Screw holes	16
1.5.3 Motherboard layout	17
1.5.4 Layout contents	17
1.6 Central Processing Unit (CPU)	18
1.6.1 Installing the CPU	18
1.6.2 Installing the heatsink and fan	20
1.7 System memory	21
1.7.1 Overview	21
1.7.2 Memory configurations	22
1.7.3 Installing a DIMM	27
1.7.4 Removing a DIMM	27
1.8 Expansion slots	28
1.8.1 Installing an expansion card	28
1.8.2 Configuring an expansion card	28
1.8.3 PCI slots	28
1.8.4 PCI Express x1 slots	28
1.8.5 PCI Express x16 slot	28
1.9 Jumpers	29
1.10 Connectors	30
1.10.1 Rear panel ports	30
1.10.2 Internal connectors	32
1.11 Software support	39
1.11.1 Installing an operating system	39
1.11.2 Support DVD information	39
BIOS information	41
2.1 Managing and updating your BIOS	41
2.1.1 ASUS Update utility	41
2.1.2 ASUS EZ Flash 2	42
2.1.3 ASUS CrashFree BIOS	43
2.2 BIOS setup program	44
2.2.1 BIOS menu screen	45
2.2.2 Menu bar	45
2.2.3 Navigation keys	45
2.2.4 Menu items	46
2.2.5 Submenu items	46
2.2.6 Configuration fields	46
2.2.7 Pop-up window	46
2.2.8 Scroll bar	46
2.2.9 General help	46
2.3 Main menu	47
2.3.1 System Time [xx:xx:xx]	47
2.3.2 System Date [Day xx/xx/xxxx]	47
2.3.3 Primary IDE Master/Slave, SATA 1/2/3/4/5/6	47
2.3.4 SATA Configuration	48
2.3.5 System Information	49
2.4 Advanced menu	49
2.4.1 JumperFree Configuration	49
2.4.2 CPU Configuration	52
2.4.3 Chipset	53
2.4.4 Onboard Device Configuration	54
2.4.5 PCIPnP	54
2.4.6 USB Configuration	55
2.5 Power menu	56
2.5.1 Suspend Mode [Auto]	56
2.5.2 ACPI 2.0 Support [Enabled]	56
2.5.3 ACPI APIC Support [Enabled]	56
2.5.4 APM Configuration	56
2.5.5 HW Monitor Configuration	57
2.6 Boot menu	58
2.6.1 Boot Device Priority	58
2.6.2 Boot Settings Configuration	58
2.6.3 Security	59
2.7 Tools menu	60
2.7.1 ASUS EZ Flash 2	60
2.7.2 Express Gate [Auto]	61
2.7.3 AI NET 2	61

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Align the other end of the retention bracket to the retention module base. A clicking

sound denotes that the retention bracket is in place.

Ensure that the fan and heatsink assembly perfectly ﬁts the retention mechanism module

base, otherwise you cannot snap the retention bracket

in place.

Push down the retention bracket lock on the retention mechanism to secure the

heatsink and fan to the module base.

When the fan and heatsink assembly is in place, connect the CPU fan cable to the

connector on the motherboard labeled CPU_FAN.

DO NOT forget to connect the CPU fan connector! Hardware monitoring errors can occur if

you fail to plug this connector.

1.7

System memory

1.7.1

Overview

The motherboard comes with four Double Data Rate 2 (DDR2) Dual Inline Memory Modules

(DIMM) sockets. A DDR2 module has the same physical dimensions as a DDR DIMM but

has a 240-pin footprint compared to the 184-pin DDR DIMM. DDR2 DIMMs are notched

differently to prevent installation on a DDR DIMM socket. The ﬁgure illustrates the location of

the DDR2 DIMM sockets:

M4A77D

M4A77D 240-pin DDR2 DIMM sockets

DIMM_A1

DIMM_B1

DIMM_A2

DIMM_B2

Channel

Sockets

Channel A

DIMM_A1 and DIMM_A2

Channel B

DIMM_B1 and DIMM_B2

ASUS M4A77D

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