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1.10 1.10.1 Connectors Rear panel connectors 1. Optical S/PDIF Out port. This port connects an external audio output device via an optical S/PDIF cable. 2. Video Graphics Adapter (VGA) port This 15-pin port is for a VGA monitor or other VGA-compatible devices. 3. USB 2.0 ports 3 and 4. These two 4-pin Universal Serial Bus (USB) ports are available for connecting USB 2.0 devices. 4. LAN (RJ-45) port. This port allows Gigabit connection to a Local Area Network (LAN) through a network hub. LAN port LED indications Activity Link LED Status Description OFF No link BLINKING Data activity Speed LED Status OFF ORANGE GREEN Description 10 Mbps connection 100 Mbps connection 1 Gbps connection ACT/LINK SPEED LED LED LAN port 5. RCA Out port (right-channel). This port connects a receiver or an amplifier via an RCA cable. 6. Center/Subwoofer port (orange). This port connects the center/subwoofer speakers. 7. Rear Speaker Out port (black). This port connects the rear speakers in a 4-channel, 6-channel, 8-channel, or 10-channel audio configuration. 8. Line In port/Side Speaker Out port (light blue). This port connects the tape, CD, DVD player, or other audio sources in an 8-channel audio configuration. In an 10-channel audio configuration, this port connects the additional side speakers. 9. Line Out port (lime). This port connects a headphone or a speaker. In 4-channel, 6-channel, 8-channel, and 10-channel configuration, the function of this port becomes Front Speaker Out. 10. Microphone port (pink). This port connects a microphone. Chapter 1: Product introduction 1-21

Section	Page
Contents	3
Notices	6
Safety information	7
About this guide	8
M4A785G HTPC Series specifications summary	9
Chapter 1 Product introduction	13
1.1 Welcome!	13
1.2 Package contents	13
1.3 Special features	13
1.3.1 Product highlights	13
1.3.2 Innovative ASUS features	14
1.4 Before you proceed	16
1.5 Motherboard overview	17
1.5.1 Placement direction	17
1.5.2 Screw holes	17
1.5.3 Motherboard layout	18
1.5.4 Layout contents	18
1.6 Central Processing Unit (CPU)	19
1.6.1 Installing the CPU	19
1.6.2 Installing the heatsink and fan	20
1.7 System memory	22
1.7.1 Overview	22
1.7.2 Memory configurations	22
1.7.3 Installing a DIMM	30
1.7.4 Removing a DIMM	30
1.8 Expansion slots	31
1.8.1 Installing an expansion card	31
1.8.2 Configuring an expansion card	31
1.8.3 PCI slot	31
1.8.4 PCI Express x1 slots	31
1.8.5 PCI Express 2.0 x16 slot	31
1.9 Jumpers	32
1.10 Connectors	33
1.10.1 Rear panel connectors	33
1.10.2 Internal connectors	37
1.11 Software support	46
1.11.1 Installing an operating system	46
1.11.2 Support DVD information	46
1.11.3 ASUS Home Theater Gate	47
Chapter 2 BIOS information	51
2.1 Managing and updating your BIOS	51
2.1.1 ASUS Update utility	51
2.1.2 ASUS EZ Flash 2 utility	52
2.1.3 ASUS CrashFree BIOS 3 utility	53
2.2 BIOS setup program	53
2.2.1 BIOS menu screen	54
2.2.2 Menu bar	54
2.2.3 Navigation keys	55
2.2.4 Menu items	55
2.2.5 Submenu items	55
2.2.6 Configuration fields	55
2.2.7 General help	55
2.2.8 Pop-up window	55
2.2.9 Scroll bar	55
2.3 Main menu	56
2.3.1 System Time [xx:xx:xx]	56
2.3.2 System Date [Day xx/xx/xxxx]	56
2.3.3 Language [English]	56
2.3.4 Primary IDE Master/Slave	56
2.3.5 SATA 1–5/ESATA	57
2.3.6 Storage Configuration	58
2.3.7 System Information	58
2.4 Ai Tweaker menu	59
2.4.1 Ai Overclock Tuner [Auto]	59
2.4.2 CPU Ratio [Auto]	59
2.4.3 DRAM Frequency [Auto]	59
2.4.4 CPU/NB Frequency [Auto]	60
2.4.5 HT Link Frequency [Auto]	60
2.4.6 Memory Configuration	60
2.4.7 DRAM Timing Configuration	60
2.4.8 CPU Voltage [Auto]	62
2.4.9 CPU/NB Voltage [Auto]	62
2.4.10 DRAM Voltage [Auto]	62
2.4.11 NB Voltage [Auto]	62
2.4.12 HT/SB Voltage [Auto]	62
2.4.13 CPU Spread Spectrum [Auto]	62
2.4.14 PCIE Spread Spectrum [Auto]	62
2.5 Advanced menu	63
2.5.1 CPU Configuration	63
2.5.2 Chipset	64
2.5.3 Onboard Devices Configuration	65
2.5.4 USB Configuration	65
2.5.5 PCIPnP	66
2.6 Power menu	66
2.6.1 Suspend Mode [Auto]	67
2.6.2 ACPI 2.0 Support [Disabled]	67
2.6.3 ACPI APIC support [Enabled]	67
2.6.4 Chassis LED [On]	67
2.6.5 EuP Ready [Disabled]	67
2.6.6 APM Configuration	67
2.6.7 Hardware Monitor	68
2.7 Boot menu	69
2.7.1 Boot Device Priority	69
2.7.2 Boot Settings Configuration	69
2.7.3 Security	70
2.8 Tools menu	71
2.8.1 ASUS EZ Flash 2	71
2.8.2 Express Gate [Auto]	71
2.8.3 AI NET 2	71