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Internal connectors

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1.10.2 Internal connectors 1. CPU, Chassis and Power Fan connectors (4-pin CPU_FAN, 4-pin CHA_FAN1, 3-pin CHA_FAN2, 3-pin PWR_FAN) The fan connectors support cooling fans of 350mA-740mA (8.88W max.) or a total of 1A-2.22A (26.64W max.) at +12V. Connect the fan cables to the fan connectors on the motherboard, making sure that the black wire of each cable matches the ground pin of the connector. Do not forget to connect the fan cables to the fan connectors. Insufficient air flow inside the system may damage the motherboard components. These are not jumpers! DO NOT place jumper caps on the fan connectors. Only the CPU_FAN and CHA_FAN1-2 connectors support the ASUS Q FAN 2 feature and the ASUS Tranquil Mode. Refer to page 2-18 for the fan type setting Chapter 1: Product introduction 1-25

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

Match case Limit results 1 per page

1.10.2

Internal connectors

CPU, Chassis and Power Fan connectors (4-pin CPU_FAN, 4-pin CHA_FAN1,

3-pin CHA_FAN2, 3-pin PWR_FAN)

The fan connectors support cooling fans of 350mA–740mA (8.88W max.) or a total of

1A–2.22A (26.64W max.) at +12V. Connect the fan cables to the fan connectors on the

motherboard, making sure that the black wire of each cable matches the ground pin of

the connector.

Do not forget to connect the fan cables to the fan connectors. Insufﬁcient air ﬂow inside the

system may damage the motherboard components. These are not jumpers! DO NOT place

jumper caps on the fan connectors.

Only the CPU_FAN and CHA_FAN1–2 connectors support the ASUS Q FAN 2 feature and

the ASUS Tranquil Mode. Refer to page 2-18 for the fan type setting

Chapter 1: Product introduction

1-25