Asus P8B75-M LX User Manual

P8B75-M LX

Motherboard

E7741

Second Edition (V2)

August 2012

Copyright © 2012 ASUSTeK COMPUTER INC. All Rights Reserved.

No part of this manual, including the products and software described in it, may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language in any form or by any means, except documentation kept by the purchaser for backup purposes, without the express written permission of ASUSTeK COMPUTER INC. (“ASUS”).

Product warranty or service will not be extended if: (1) the product is repaired, modified or altered, unless such repair, modification of alteration is authorized in writing by ASUS; or (2) the serial number of the product is defaced or missing.

ASUS PROVIDES THIS MANUAL “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OR CONDITIONS OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL ASUS, ITS DIRECTORS, OFFICERS, EMPLOYEES OR AGENTS BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF PROFITS, LOSS OF BUSINESS, LOSS OF USE OR DATA, INTERRUPTION OF BUSINESS AND THE LIKE), EVEN IF ASUS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES ARISING FROM ANY DEFECT OR ERROR IN THIS MANUAL OR PRODUCT.

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Where the applicable license entitles you to the source code of such software and/or other additional data, you may obtain it for a period of three years after our last shipment of the product, either

(1)for free by downloading it from http://support.asus.com/download

or

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ii

Contents

Safety information.......................................................................................	vi
About this guide..........................................................................................	vi
P8B75-M LX specifications summary......................................................	viii

Chapter 1		Product introduction
1.1	Welcome!.......................................................................................		1-1
1.2	Package contents.........................................................................		1-1
1.3	Special features............................................................................		1-1
	1.3.1	Product highlights ............................................................	1-1
	1.3.2	Innovative ASUS features ................................................	1-3
1.4	Before you proceed......................................................................		1-5
1.5	Motherboard overview.................................................................		1-6
	1.5.1	Placement direction .........................................................	1-6
	1.5.2	Screw holes .....................................................................	1-6
	1.5.3	Motherboard layout ..........................................................	1-7
	1.5.4	Layout contents . ..............................................................	1-7
1.6	Central Processing Unit (CPU)....................................................		1-8
	1.6.1	Installing the CPU ............................................................	1-9
	1.6.2	CPU heatsink and fan assembly installation ..................	1-11
1.7	System memory..........................................................................		1-13
	1.7.1	Overview ........................................................................	1-13
	1.7.2	Memory configurations . .................................................	1-13
	1.7.3	Installing a DIMM ...........................................................	1-20
	1.7.4	Removing a DIMM .........................................................	1-20
1.8	Expansion slots..........................................................................		1-21
	1.8.1	Installing an expansion card ..........................................	1-21
	1.8.2	Configuring an expansion card ......................................	1-21
	1.8.3	PCI slot ..........................................................................	1-21
	1.8.4	PCI Express 2.0 x1 slots ...............................................	1-21
	1.8.5	PCI Express 3.0/2.0 x16 slot . ........................................	1-21
1.9	Jumpers	.......................................................................................	1-22
1.10	Connectors..................................................................................		1-23
	1.10.1 ..................................................	Rear panel connectors	1-23
	1.10.2 ........................................................	Internal connectors	1-25
1.11	Onboard .............................................................................LEDs		1-31

iii

Contents

1.13 Software support........................................................................		1-32
1.13.1 Installing an operating system.......................................		1-32
1.13.2	Support DVD information...............................................	1-32
1.13.3	Intel® SBA support.........................................................	1-33

Chapter 2		BIOS information
2.1	Managing and updating your BIOS.............................................		2-1
	2.1.1	ASUS Update utility.........................................................	2-1
	2.1.2	ASUS EZ Flash 2............................................................	2-2
	2.1.3	ASUS CrashFree BIOS 3 utility.......................................	2-3
	2.1.4	ASUS BIOS Updater.......................................................	2-4
2.2	BIOS setup program.....................................................................		2-6
2.3	Main menu...................................................................................		2-10
	2.3.1	System Language [English]...........................................	2-10
	2.3.2	System Date [Day xx/xx/xxxx].......................................	2-10
	2.3.3	System Time [xx:xx:xx]..................................................	2-10
	2.3.4	Security..........................................................................	2-10
2.4	Ai Tweaker menu........................................................................		2-12
	2.4.1	ASUS MultiCore Enhancement [Enabled].........................	2-12
	2.4.2	CPU bus speed: DRAM speed ratio mode [Auto]..........	2-12
	2.4.3	Memory Frequency [Auto].............................................	2-13
	2.4.4	iGPU Max. Frequency [Auto].........................................	2-13
	2.4.5	GPU Boost [OK]............................................................	2-13
	2.4.6	DRAM Timing Control....................................................	2-13
	2.4.7	CPU Power Management..............................................	2-13
2.5	Advanced menu..........................................................................		2-15
	2.5.1	CPU Configuration.........................................................	2-15
	2.5.2	PCH Configuration.........................................................	2-16
	2.5.3	SATA Configuration........................................................	2-17
	2.5.4	System Agent Configuration..........................................	2-18
	2.5.5	AMT Configuration.........................................................	2-18
	2.5.6	USB Configuration.........................................................	2-19
	2.5.7	Onboard Devices Configuration....................................	2-20
	2.5.8	APM...............................................................................	2-21
	2.5.9	Network Stack...............................................................	2-21
2.6	Monitor menu..............................................................................		2-22

iv

Contents

2.6.1 CPU Temperature / MB Temperature [xxxºC/xxxºF]...... 2-23

2.6.2CPU / Chassis Fan Speed [xxxx RPM] or [Ignore] / [N/A]2-23

	2.6.3	CPU Q-Fan Control [Enabled].......................................	2-23
	2.6.4	Chassis Q-Fan Control [Enabled]..................................	2-24
	2.6.5	CPU Voltage, 3.3V Voltage, 5V Voltage, 12V Voltage...	2-24
	2.6.6	Anti Surge Support [Enabled]........................................	2-24
2.7	Boot menu...................................................................................		2-25
	2.7.1	Bootup NumLock State [On]..........................................	2-25
	2.7.2	Full Screen Logo [Enabled]...........................................	2-25
	2.7.3	Wait for ‘F1’ If Error [Enabled]........................................	2-25
	2.7.4	Option ROM Messages [Force BIOS]...........................	2-26
	2.7.5	Setup Mode [EZ Mode]..................................................	2-26
	2.7.6	UEFI/Legacy Boot [Enabled both UEFI and Legacy]....	2-26
	2.7.7	PCI ROM Priority [Legacy ROM]...................................	2-26
	2.7.8	Boot Option Priorities.....................................................	2-26
	2.7.9	Boot Override................................................................	2-26
2.8	Tools menu..................................................................................		2-27
	2.8.1	ASUS EZ Flash 2 Utility.................................................	2-27
	2.8.2	ASUS O.C. Profile.........................................................	2-27
	2.8.3	ASUS SPD Information.................................................	2-27
2.9	Exit menu.....................................................................................		2-28

Appendices

Notices.......................................................................................................	A-1
ASUS contact information........................................................................	A-3

Safety information

Electrical safety

•To prevent electric shock hazard, disconnect the power cable from the electric outlet before relocating the system.

•When adding or removing devices to or from the system, ensure that the power cables for the devices are unplugged before the signal cables are connected. If possible, disconnect all power cables from the existing system before you add a device.

•Before connecting or removing signal cables from the motherboard, ensure that all power cables are unplugged.

•Seek professional assistance before using an adapter or extension cord. These devices could interrupt the grounding circuit.

•Ensure that your power supply is set to the correct voltage in your area. If you are not sure about the voltage of the electrical outlet you are using, contact your local power company.

•If the power supply is broken, do not try to fix it by yourself. Contact a qualified service technician or your retailer.

Operation safety

•Before installing the motherboard and adding devices on it, carefully read all the manuals that came with the package.

•Before using the product, ensure that all cables are correctly connected and the power cables are not damaged. If you detect any damage, contact your dealer immediately.

•To avoid short circuits, keep paper clips, screws, and staples away from connectors, slots, sockets and circuitry.

•Avoid dust, humidity, and temperature extremes. Do not place the product in any area where it may become wet.

•Place the product on a stable surface.

•If you encounter technical problems with the product, contact a qualified service technician or your retailer.

About this guide

This user guide contains the information you need when installing and configuring the motherboard.

How this guide is organized

This guide contains the following parts:

•Chapter 1: Product introduction

This chapter describes the features of the motherboard and the new technology it supports.

•Chapter 2: BIOS information

This chapter tells how to change system settings through the BIOS Setup menus. Detailed descriptions of the BIOS parameters are also provided.

vi

Conventions used in this guide

To ensure that you perform certain tasks properly, take note of the following symbols used throughout this manual.

DANGER/WARNING: Information to prevent injury to yourself when trying to complete a task.

CAUTION: Information to prevent damage to the components when trying to complete a task.

IMPORTANT: Instructions that you MUST follow to complete a task.

NOTE: Tips and additional information to help you complete a task.

Where to find more information

Refer to the following sources for additional information and for product and software updates.

1.ASUS websites

The ASUS website provides updated information on ASUS hardware and software products. Refer to the ASUS contact information.

2.Optional documentation

Your product package may include optional documentation, such as warranty flyers, that may have been added by your dealer. These documents are not part of the standard package.

Typography

Bold text	Indicates a menu or an item to select.
Italics	Used to emphasize a word or a phrase.
<Key>	Keys enclosed in the less-than and greater-than sign means
	that you must press the enclosed key.
	Example: <Enter> means that you must press the Enter or
	Return key.
<Key1>+<Key2>+<Key3>	If you must press two or more keys simultaneously, the key
	names are linked with a plus sign (+).
	Example: <Ctrl>+<Alt>+<D>

vii

P8B75-M LX specifications summary

CPU	LGA1155 socket for Intel® 2nd / 3rd Generation Core™ i7 /
		Core™ i5 / Core™ i3 processors
	Supports Intel 22/32nm CPU
	Supports Intel® Turbo Boost Technology 2.0
	* The Intel® Turbo Boost Technology 2.0 support depends on the
	CPU types.
	** Refer to www.asus.com for Intel® CPU support list.
Chipset	Intel® B75 Express Chipset
Memory	2 x DIMM, max. 16GB*, DDR3 2200(O.C.) / 2133(O.C.) / 2000(O.
		C.) /1800(O.C.) / 1600 / 1333 / 1066 MHz, non-ECC,
		un-buffered memory
	Dual-channel memory architecture
	*	1600MHz and higher frequency is supported by Intel® 3rd
		generation processors.
	**	Refer to www.asus.com for the latest Memory QVL (Qualified
		Vendors List).
	*** When you install a total memory of 4GB capacity or more,
		Windows® 32-bit operating system may only recognize less

than 3GB. We recommend a maximum of 3GB system memory if you are using a Windows® 32-bit operating system.

Graphics

Expansion slots

Integrated graphics processor

Multi-VGA output support: DVI-D and D-Sub ports

Supports DVI-D with max.resolution of 1920 x 1200 @60Hz Supports D-Sub with max. resolution of 2048 x 1536 @75Hz

Maximum shared memory of 1 GB

1 x PCI Express 3.0/2.0 x16 slot

2 x PCI Express 2.0 x1 slots

1 x PCI slot

Storage	Intel® B75 Express Chipset:
	- 5 x Serial ATA 3.0 Gb/s connectors (blue)
	- 1 x Serial ATA 6.0 Gb/s connector (gray)
LAN	Realtek® 8111F-VB-CG PCIe Gigabit LAN controller
Audio	VIA® VT1708S 8-channel* High Definition Audio CODEC
	- Supports jack-detection, multi-streaming, anti-pop function, and
	front panel jack-retasking
	* Use a chassis with HD audio module in the front panel to support
	an 8-channel audio output.
USB	Intel® B75 Express Chipset:
	- 4 x USB 3.0/2.0 ports (2 ports at midboard, 2 ports at back
	panel)
	- 8 x USB 2.0/1.1 ports (4 ports at midboard, 4 ports at back
	panel)
	(continued on the next page)

viii

P8B75-M LX specifications summary

ASUS unique features ASUS Exclusive Features:

-ASUS GPU Boost

-ASUS USB 3.0 Boost

-LucidLogix® Virtu MVP

-Network iControl

-ASUS AI Suite II

-Ai Charger

-ASUS Anti-Surge Protection

-ASUS UEFI BIOS featuring graphics user interface

ASUS Quiet Thermal Solution:

-ASUS Fan Xpert

ASUS EZ DIY:

-ASUS CrashFree BIOS 3

-ASUS EZ Flash 2

-ASUS MyLogo 2™

Rear panel I/O ports 1 x PS/2 keyboard/mouse combo port (purple/green) 1 x DVI-D port

1 x D-Sub port

1 x LAN (RJ-45) port

4 x USB 2.0/1.1 ports

2 x USB 3.0/2.0 ports (blue)

3 x Audio jacks

Internal connectors/ 1 x USB 3.0 connector supports additional 2 USB 3.0 ports switches/ buttons 2 x USB 2.0 connectors support additional 4 USB 2.0 ports

5 x SATA 3.0 Gb/s connectors (blue)

1 x SATA 6.0 Gb/s connector (gray)

1 x CPU fan connector

1 x Chassis fan connectors

1 x COM connector

1 x LPT connector

1 x Front panel audio connector (AAFP)

1 x S/PDIF output connector

1 x System panel connector

1 x Speaker connector

1 x 24-pin ATX power connector

1 x 4-pin ATX 12V power connector

1 x chassis intrusion connector

1 x CLRTC connector

(continued on the next page)

ix

P8B75-M LX specifications summary

BIOS features

Manageability

Accessories

Support DVD

Form factor

128 Mb Flash ROM, AMI BIOS, PnP, DMI2.0, WfM2.0, SM BIOS 2.5, ACPI 2.0a, Multi-language BIOS, ASUS EZ Flash 2, ASUS CrashFree BIOS 3

WfM 2.0, DMI 2.0, WOL by PME, WOR by PME, PXE

1 x Serial ATA 3.0Gb/s cable

1 x Serial ATA 6.0Gb/s cable

1 x I/O shield

1 x User Manual

1 x Support DVD

Drivers

ASUS utilities

ASUS Update

Anti-virus software (OEM version)

MicroATX form factor: 9.6”x 7.8” (24.4cm x 19.8cm)

* Specifications are subject to change without notice.

Chapter 1

Product introduction

1.1Welcome!

Thank you for buying an ASUS® P8B75-M LX motherboard!

The motherboard delivers a host of new features and latest technologies, making it another standout in the long line of ASUS quality motherboards!

Before you start installing the motherboard, and hardware devices on it, check the items in your package with the list below.

1.2Package contents

Check your motherboard package for the following items.

Motherboard	ASUS P8B75-M LX motherboard
Cables	1 x Serial ATA 6.0Gb/s cable
	1 x Serial ATA 3.0Gb/s cable
Accessories	1 x I/O shield
Application DVD	ASUS motherboard support DVD
Documentation	User Manual

If any of the above items is damaged or missing, contact your retailer.

1.3Special features

1.3.1Product highlights

LGA1155 socket for Intel® 3rd/2nd Generation Core™ i7 / Core™ i5 / Core™ i3 processors

This motherboard supports the Intel® 3rd/2nd generation Core™ i7 / Core™ i5 / Core™ i3 processors in the LGA1155 package, with memory and PCI Express controllers integrated to support dual-channel (4 DIMMs) DDR3 memory and 16 PCI Express 3.0 lanes. This provides great graphics performance. Intel® 3rd/2nd generation Core™ i7 / Core™ i5 / Core™ i3 processors are among the most powerful and energy efficient CPUs in the world.

ASUS P8B75-M LX

1-1

Intel® B75 Express Chipset

The Intel® B75 Express Chipset is the latest single-chipset designed to support the 1155 socket Intel® 3rd/2nd generation Core™ i7 / Core™ i5 /

Core™ i3 processors. It provides improved performance by utilizing serial point-to-point links, allowing increased bandwidth and stability. In addition, B75 chipset provides 4 USB 3.0 ports that retrieves data 10 times faster.

Moreover, Intel® B75 Express Chipset also supports iGPU function, letting users enjoy the latest Intel integrated graphic performance.

Dual-Channel DDR3 2400(O.C.) / 2250(O.C.) / 2200(OC.) / 2133(O.C.) / 2000 / 1866 /1600 / 1333 / 1066MHz support

The motherboard supports DDR3 memory that features data transfer rates of 2400(O.C.) / 2250(O.C.) / 2200(OC.) / 2133(O.C.) / 2000 / 1866

/1600 / 1333 / 1066 MHz to meet the higher bandwidth requirements of the latest 3D graphics, multimedia, and Internet applications. The dual-channel DDR3 architecture enlarges the bandwidth of your system memory to boost system performance.

*Due to the behavior of Intel® 3rd Generation processor, DDR3 2250 (and above)/2133/1866 MHz memory module will run at DDR3 2200/2000/1800 MHz frequency as default.

Native SATA 6.0 Gb/s support

The Intel® B75 Express Chipset natively supports next-generation Serial ATA (SATA) storage interface. This motherboard delivers up to 6.0 Gb/s data transfer rates. Additionally, get enhanced scalability, faster data retrieval, double the bandwidth of current bus systems.

Complete USB 3.0 Integration

ASUS facilitates strategic USB 3.0 accessibility for both the front and rear panel – 4 USB 3.0 ports in total. Experience the latest plug & play connectivity at speeds up to 10 times faster than USB 2.0. This motherboard affords greater convenience to high speed connectivity.

PCI Express® 3.0

PCI Express® 3.0 (PCIe 3.0) is the latest PCI Express bus standard with improved encoding schemes that provide twice the performance of the current PCIe 2.0. The total bandwidth for a x16 link reaches a maximum of 32Gb/s, double the 16 Gb/s of PCIe 2.0 (in x16 mode). As such, PCIe 3.0 provides users an unprecendented data speeds, combined with the convenience and seamless transition offerred by complete backward compatibility with PCIe 1.0 and PCIe 2.0 devices. PCIe 3.0 will become a must-have feature for users who wish to improve and optimize graphic performance, as well as have the latest technology available to them.

* PCI 3.0 speed is supported by Intel® 3rd generation Core™ processors.

1-2	Chapter 1: Product introduction

1.3.2Innovative ASUS features

ASUS UEFI BIOS

Flexible and Easy BIOS Interface

ASUS UEFI BIOS offers the first mouse-controlled graphical BIOS designed with selectable modes, providing a user-friendly interface that goes beyond the traditional keyboard-only controls. It also natively supports fully-utilized hard drives larger than 2.2TB in 64-bit operating systems.

ASUS exclusive interface

EZ Mode displays frequently-accessed info. Users can choose system performance settings, and drag and drop boot priorities. Advanced Mode for performance enthusiasts includes detailed DRAM settings via a dedicated memory info page for complete insight.

New upgrade! Quick and easy information for enhanced system control

-F12 BIOS snapshot hotkey for sharing UEFI information and troubleshooting

-New F3 Shortcut for most accessed information

-ASUS DRAM SPD (Serial Presence Detect) information for accessing memory information, detecting faulty DIMMs, and helping with difficult

POST situations.

LucidLogix Virtu MVP

LucidLogix Virtu MVP featuring HyperFormance™ Technology boosts your discrete graphics card up to 60% beyond its original performance. Designed for Intel® processor graphics and Windows® 7 PCs, it perfectly combines the performance of discrete graphic cards with fast computing iGPU. Also, with newly designed Virtual Sync, users can enjoy a smoother gaming experience by eliminating tearing artifacts. LucidLogix Virtu MVP can also dynamically assigns tasks to the best available graphics resource, based on power, performance, and system load.

This allows users to fully utilize 3x faster video conversion with Intel®

Quick Sync Video technology while retaining high-end 3D rendering and gaming performance, provided by both NVIDIA and AMD graphic cards. When the discrete graphic card is not required, power consumption goes automatically down to near zero, making the system more environmentally-friendly. For users searching for perfection, LucidLogix

Virtu MVP provides great graphical performance, and the best flexibility and efficiency.

*LucidLogix Virtu MVP supports Windows® operating system.

**Intel® Quick Sync Video feature is supported by 3rd/2nd generation Intel® Core™ processor family

ASUS P8B75-M LX

1-3

USB 3.0 Boost

With USB 3.0 Boost technology, a USB device’s transmission speed is significantly increased, adding to an already impressive fast USB 3.0 transfer speed. ASUS software automatically accelerates data speeds for compatible USB 3.0 peripherals without the need for any user interaction.

GPU Boost

Go to the Limit with iGPU Level Up!

GPU Boost accelerates the integrated GPU for extreme graphics performance. The user-friendly interface facilitates flexible frequency adjustments. It easily delivers stable system-level upgrades for every use.

AI Suite II

With its fast user-friendly interface, ASUS AI Suite II consolidates all the exclusive ASUS features into one simple to use software package. It allows you to supervise overclocking, energy management, fan speed control, and voltage and sensor readings. This all-in-one software offers diverse and ease to use functions, with no need to switch back and forth between different utilities.

ASUS Anti-Surge Protection

This special design prevents expensive devices and the motherboard from damage caused by power surges from switching power supply (PSU).

Network iControl

With a one-click on/off button, the software currently in use is set as top priority over all other network programs, dominating the network bandwidth with ease. Moreover, you can prioritize your favorite software easily by configuring profiles through the intutive user interface. Within

the profile, programs can be pre-scheduled to run in a specific time period to avoid network clogging and long-waits on downloads. Auto PPPoE network connection gives a one-step setup and an intuitive network bandwidth control center.

ASUS Fan Xpert

ASUS Fan Xpert intelligently allows you to adjust the CPU fan and chassis fan speeds according to different ambient temperatures caused by different climate conditions in different geographic regions and your

PC’s loading. The built-in variety of useful profiles offer flexible controls of fan speed to achieve a quiet and cool environment.

Ai Charger

Ai Charger is ASUS fast-charging software that supports iPod, iPhone, and iPad.

• Check your USB mobile device if it fully supports the BC 1.1 function.

• The actual charging speed may vary with your USB device’s conditions.

1-4	Chapter 1: Product introduction

ASUS MyLogo2™

This feature allows you to convert your favorite photo into a 256-color boot logo for a more colorful and vivid image on your screen.

ASUS CrashFree BIOS 3

ASUS CrashFree BIOS 3 is an auto-recovery tool that allows you to restore a corrupted BIOS file using the bundled support DVD or USB flash disk that contains the latest BIOS file.

ASUS EZ Flash 2

ASUS EZ Flash 2 is a utility that allows you to update the BIOS without using an OS-based utility.

C.P.R. (CPU Parameter Recall)

The BIOS C.P.R. feature automatically restores the CPU default settings when the system hangs due to overclocking failure. C.P.R. eliminates the need to open the system chassis and clear the RTC data. Simply shut down and reboot the system, and the BIOS automatically restores the CPU parameters to their default settings.

ErP ready

The motherboard is European Union´s Energy-related Products (ErP) ready, and ErP requires products to meet certain energy efficiency requirements in regards to energy consumptions. This is in line with

ASUS vision of creating environment-friendly and energy-efficient products through product design and innovation to reduce carbon footprint of the product and thus mitigate environmental impacts.

1.4Before you proceed

Take note of the following precautions before you install motherboard components or change any motherboard settings.

• Unplug the power cord from the wall socket before touching any component.

•Before handling components, use a grounded wrist strap or touch a safely grounded object or a metal object, such as the power supply case, to avoid damaging them due to static electricity.

•Hold components by the edges to avoid touching the ICs on them.

•Whenever you uninstall any component, place it on a grounded antistatic pad or in the bag that came with the component.

•Before you install or remove any component, ensure that the ATX power supply is switched off or the power cord is detached from the power supply. Failure to do so may cause severe damage to the motherboard, peripherals, or components.

ASUS P8B75-M LX

1-5

1.5Motherboard overview

Before you install the motherboard, study the configuration of your chassis to ensure that the motherboard fits into it.

Ensure that you unplug the power cord before installing or removing the motherboard. Failure to do so can cause you physical injury and damage motherboard components.

1.5.1Placement direction

When installing the motherboard, ensure that you place it into the chassis in the correct orientation. The edge with external ports goes to the rear part of the chassis as indicated in the image below.

1.5.2Screw holes

Place six screws into the holes indicated by circles to secure the motherboard to the chassis.

Do not overtighten the screws! Doing so can damage the motherboard.

Place this side towards the rear of the chassis

P8B75-M LX

1-6

Chapter 1: Product introduction

1.5.3Motherboard layout

1

2

3

1

4

19.8cm(7.8in)

KBMS_USB34

CPU_FAN

DVI

ATX12V

VGA

LGA1155

(64bit, 240-pin module)

(64bit, 240-pin module)

2

A1

B1

8111F

_

_

EATXPWR

24.4cm(9.6in)

USB3_12

DIMMDDR3

DIMMDDR3

34USB3

CHA_FAN

LAN_USB12

RTL

Lithium Cell

5

CMOS Power

AUDIO

PCIEX16_1

P8B75-M LX

SATA3G_1

Super

PCIEX1_1

SATA3G_2

Intel®

6

I/O

B75

8Mb

PCIEX1_2

CLRTC

BIOS

8Mb

CHASSIS

BIOS

VIA

PCI1

SATA3G_4 SATA3G_3

VT1708S

SPDIF_OUT

AAFP COM1

LPT

SB_PWR

USB78

USB56

SATA3G_5 SATA6G_1

SPEAKER

F_PANEL

17

16

15

14

13

12

11

10

9

8

6

7

1.5.4Layout contents

	Connectors/Jumpers/Slots/LED	Page		Connectors/Jumpers/Slots/LED	Page
1.	CPU and chassis fan connectors (4-pin	1-27	10.	Clear RTC RAM (3-pin CLRTC)	1-22
	CPU_FAN, 3-pin CHA_FAN)
2.	ATX power connectors (24-pin EATXPWR,	1-26	11.	USB 2.0 connectors (10-1 pin USB56,	1-30
	4-pin ATX12V)			USB78)
3.	Intel® LGA1155 CPU socket	1-8	12.	Onboard LED (SB_PWR)	1-31
4.	DDR3 DIMM slots	1-13	13.	LPT connector (26-1 pin LPT)	1-27
5.	USB 3.0 connector (20-1 pin USB3_34)	1-30	14	Digital audio connector (4-1 pin SPDIF_OUT)	1-25
6.	Intel® B75 Serial ATA 3.0Gb/s connectors	1-29	15.	Serial port connector (10-1 pin COM1)	1-26
	(7-pin SATA3G_1~5 [blue])
7.	Intel® B75 Serial ATA 6.0Gb/s connectors	1-29	16.	Front panel audio connector (10-1 pin AAFP)	1-25
	(7-pin SATA6G_1 [gray])
8.	System panel connector (10-1 pin F_PANEL)	1-28	17.	Chassis intrusion connector (4-1 pin	1-31
				CHASSIS)
9.	Speaker connector (4-pin SPEAKER)	1-28

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1.6Central Processing Unit (CPU)

The motherboard comes with a surface mount LGA1155 socket designed for the Intel® 3rd/2nd generation Core™ i7 / Core™ i5 / Core™ i3 processors.

P8B75-M LX

P8B75-M LX CPU socket LGA1155

Unplug all power cables before installing the CPU.

• Upon purchase of the motherboard, ensure that the PnP cap is on the socket and the socket contacts are not bent. Contact your retailer immediately if the PnP cap is missing, or if you see any damage to the PnP cap/socket contacts/motherboard components. ASUS will shoulder the cost of repair only if the damage is shipment/transit-related.

•Keep the cap after installing the motherboard. ASUS will process Return Merchandise

Authorization (RMA) requests only if the motherboard comes with the cap on the

LGA1155 socket.

•The product warranty does not cover damage to the socket contacts resulting from incorrect CPU installation/removal, or misplacement/loss/incorrect removal of the PnP cap.

1-8	Chapter 1: Product introduction

1.6.1Installing the CPU

The LGA1156 CPU is incompatible with the LGA1155 socket. DO NOT install a LGA1156 CPU on the LGA1155 socket.

1

A

B

2

3

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4 C

A

5

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1.6.2CPU heatsink and fan assembly installation

Apply the Thermal Interface Material to the CPU heatsink and CPU before you install the heatsink and fan if necessary.

To install the CPU heatsink and fan assembly

1 A 2

B

B

A

3

4

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To uninstall the CPU heatsink and fan assembly

1

2

A

B

B

A

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1.7System memory

1.7.1Overview

The motherboard comes with four Double Data Rate 3 (DDR3) Dual Inline Memory Modules (DIMM) sockets. A DDR3 module has the same physical dimensions as a DDR2 DIMM but is notched differently to prevent installation on a DDR2 DIMM socket. DDR3 modules are developed for better performance with less power consumption.

The figure illustrates the location of the DDR3 DIMM sockets:

DIMM_B1

DIMM_A1

Channel

Sockets

Channel A

DIMM_A1

Channel B

DIMM_B1

P8B75-M LX

P8B75-M LX 240-pin DDR3 DIMM sockets

1.7.2Memory configurations

You may install 1GB, 2GB, 4GB and 8GB unbuffered non ECC DDR3 DIMMs into the DIMM sockets.

•You may install varying memory sizes in Channel A and Channel B. The system maps the total size of the lower-sized channel for the dual-channel configuration. Any excess memory from the higher-sized channel is then mapped for single-channel operation.

•Due to Intel® 3rd generation processors' behavior, DDR3 2250 (and above)/2133/1866

MHz memory module will run at DDR3 2200/2000/1800 MHz frequency as default.

•Always install DIMMs with the same CAS latency. For optimum compatibility, we recommend that you obtain memory modules from the same vendor.

•Due to the memory address limitation on 32-bit Windows® OS, when you install 4GB or more memory on the motherboard, the actual usable memory for the OS can be about 3GB or less. For effective use of memory, we recommend that you do any of the following:

-Use a maximum of 3GB system memory if you are using a 32-bit Windows® OS.

-Install a 64-bit Windows® OS when you want to install 4GB or more on the motherboard.

•This motherboard does not support DIMMs made up of 512Mb (64MB) chips or less.

•The default memory operation frequency is dependent on its Serial Presence Detect (SPD), which is the standard way of accessing information from a memory module. Under the default state, some memory modules for overclocking may operate at a lower frequency than the vendor-marked value. To operate at the vendor-marked or at a higher frequency, refer to section 2.4 Ai Tweaker menu for manual memory frequency adjustment.

•For system stability, use a more efficient memory cooling system to support a full memory load (2 DIMMs) or overclocking condition.

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