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Onboard LEDs

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+5VSB_MB Chassis Signal GND 13. Chassis intrusion connector (4-1 pin CHASSIS) This connector is for a chassis-mounted intrusion detection sensor or switch. Connect one end of the chassis intrusion sensor or switch cable to this connector. The chassis intrusion sensor or switch sends a high-level signal to this connector when a chassis component is removed or replaced. The signal is then generated as a chassis intrusion event. By default, the pin labeled "Chassis Signal" and "Ground" are shorted with a jumper cap. Remove the jumper caps only when you intend to use the chassis intrusion detection feature. CHASSIS P8B75-M LX P8B75-M LX Chassis intrusion connector 1.11 Onboard LEDs 1. Standby Power LED The motherboard comes with a standby power LED that lights up to indicate that the system is ON, in sleep mode, or in soft-off mode. This is a reminder that you should shut down the system and unplug the power cable before removing or plugging in any motherboard component. The illustration below shows the location of the onboard LED. SB_PWR P8B75-M LX ON OFF Standby Power Powered Off P8B75-M LX Onboard LED ASUS P8B75-M LX 1-31

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

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ASUS P8B75-M LX

1-31

13.

Chassis intrusion connector (4-1 pin CHASSIS)

This connector is for a chassis-mounted intrusion detection sensor or switch. Connect

one end of the chassis intrusion sensor or switch cable to this connector. The chassis

intrusion sensor or switch sends a high-level signal to this connector when a chassis

component is removed or replaced. The signal is then generated as a chassis intrusion

event.

By default, the pin labeled “Chassis Signal” and “Ground” are shorted with a jumper

cap. Remove the jumper caps only when you intend to use the chassis intrusion

detection feature.

P8B75-M LX

P8B75-M LX Chassis intrusion connector

+5VSB_MB

Chassis Signal

GND

CHASSIS

1.11

Onboard LEDs

Standby Power LED

The motherboard comes with a standby power LED that lights up to indicate that the

system is ON, in sleep mode, or in soft-off mode. This is a reminder that you should

shut down the system and unplug the power cable before removing or plugging in any

motherboard component. The illustration below shows the location of the onboard LED.

SB_PWR

Standby Power

Powered Off

OFF

P8B75-M LX

P8B75-M LX Onboard LED