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1.10 Connectors 1.10.1 Rear panel connectors 1 2 34 10 9 8 7 6 5 1. PS/2 Mouse port (green). This port is for a PS/2 mouse. 2. LAN (RJ-45) port. This port allows Gigabit connection to a Local Area Network (LAN) through a network hub. Refer to the table below for the LAN port LED indications. LAN port LED indications ACT/LINK LED Status Description OFF No link ORANGE Linked BLINKING Data activity Status OFF ORANGE GREEN SPEED LED Description 10 Mbps connection 100 Mbps connection 1 Gbps connection Activity Link Speed LED LED LAN port 3. Line In port (light blue). This port connects the tape, CD, DVD player, or other audio sources. 4. Line Out port (lime). This port connects to a headphone or a speaker. In 4-channel, 6-channel, and 8-channel configurations, the function of this port becomes Front Speaker Out. 5. Microphone port (pink). This port connects a microphone. Refer to the audio configuration table below for the function of the audio ports in the 2, 4, 6, or 8-channel configuration. Audio 2, 4, 6, 8-channel configuration Port Light Blue (Rear panel) Lime (Rear panel) Pink (Rear panel) Lime (Front panel) Headset 2-channel Line In Line Out Mic In - 4-channel Rear Speaker Out Front Speaker Out Mic In - 6-channel Rear Speaker Out Front Speaker Out Bass/Center - 8-channel Rear Speaker Out Front Speaker Out Bass/Center Side Speaker Out To configure an 8-channel audio output: Use a chassis with HD audio module in the front panel to support an 8-channel audio output. ASUS P8B75-M LX 1-23

Section	Page
Safety information	6
About this guide	6
P8B75-M LX specifications summary	8
Chapter 1	11
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	19
1.6.2 CPU heatsink and fan assembly installation	21
1.7 System memory	23
1.7.1 Overview	23
1.7.2 Memory configurations	23
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 2.0 x1 slots	31
1.8.5 PCI Express 3.0/2.0 x16 slot	31
1.9 Jumpers	32
1.10 Connectors	33
1.10.1 Rear panel connectors	33
1.10.2 Internal connectors	35
1.11 Onboard LEDs	41
1.13 Software support	42
1.13.1 Installing an operating system	42
1.13.2 Support DVD information	42
1.13.3 Intel® SBA support	43
Chapter 2	45
BIOS information	45
2.1 Managing and updating your BIOS	45
2.1.1 ASUS Update utility	45
2.1.2 ASUS EZ Flash 2	46
2.1.3 ASUS CrashFree BIOS 3 utility	47
2.1.4 ASUS BIOS Updater	48
2.2 BIOS setup program	50
2.3 Main menu	54
2.3.1 System Language [English]	54
2.3.2 System Date [Day xx/xx/xxxx]	54
2.3.3 System Time [xx:xx:xx]	54
2.3.4 Security	54
2.4 Ai Tweaker menu	56
2.4.1 ASUS MultiCore Enhancement [Enabled].	56
2.4.2 CPU bus speed: DRAM speed ratio mode [Auto]	56
2.4.3 Memory Frequency [Auto]	57
2.4.4 iGPU Max. Frequency [Auto]	57
2.4.5 GPU Boost [OK]	57
2.4.6 DRAM Timing Control	57
2.4.7 CPU Power Management	57
2.4.8 CPU Offset Mode Sign [+]	58
2.4.9 DRAM Voltage [Auto]	58
2.4.10 VCCSA Voltage [Auto]	59
2.4.11 PCH Voltage [Auto]	59
2.5 Advanced menu	60
2.5.1 CPU Configuration	60
2.5.2 PCH Configuration	61
2.5.3 SATA Configuration	62
2.5.4 System Agent Configuration	63
2.5.5 AMT Configuration	63
2.5.6 USB Configuration	64
2.5.7 Onboard Devices Configuration	65
2.5.8 APM	66
2.5.9 Network Stack	66
2.6 Monitor menu	67
2.6.1 CPU Temperature / MB Temperature [xxxºC/xxxºF]	68
2.6.2 CPU / Chassis Fan Speed [xxxx RPM] or [Ignore] / [N/A]	68
2.6.3 CPU Q-Fan Control [Enabled]	68
2.6.4 Chassis Q-Fan Control [Enabled]	69
2.6.5 CPU Voltage, 3.3V Voltage, 5V Voltage, 12V Voltage	69
2.6.6 Anti Surge Support [Enabled]	69
2.7 Boot menu	70
2.7.1 Bootup NumLock State [On]	70
2.7.2 Full Screen Logo [Enabled]	70
2.7.3 Wait for ‘F1’ If Error [Enabled]	70
2.7.4 Option ROM Messages [Force BIOS]	71
2.7.5 Setup Mode [EZ Mode]	71
2.7.6 UEFI/Legacy Boot [Enabled both UEFI and Legacy]	71
2.7.7 PCI ROM Priority [Legacy ROM]	71
2.7.8 Boot Option Priorities	71
2.7.9 Boot Override	71
2.8 Tools menu	72
2.8.1 ASUS EZ Flash 2 Utility	72
2.8.2 ASUS O.C. Profile	72
2.8.3 ASUS SPD Information	72
2.9 Exit menu	73
Appendices	75
Notices	75