Asus P8B75-M LX PLUS User Manual

P8B75-M LX PLUS

Motherboard

E7517
First Edition

July 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,
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means, except documentation kept by the purchaser for backup purposes, without the express written
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Product warranty or service will not be extended if: (1) the product is repaired, modied or altered, unless
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ii

Contents

Safety information ...................................................................................... vi

About this guide ......................................................................................... vi

P8B75-M LX PLUS specications summary .......................................... viii

Product introduction

1.1 Special features ............................................................................ 1-1

1.1.1 Product highlights ...........................................................

1.1.2 ASUS Exclusive features ................................................

1.2 Before you proceed .....................................................................

1.3 Motherboard overview .................................................................

1.3.1 Placement direction ........................................................

1.3.2 Screw holes ....................................................................

1.3.3 Motherboard layout .........................................................

1.3.4 Layout contents ...............................................................

1.4 Central Processing Unit (CPU) ...................................................

1.4.1 Installing the CPU .........................................................

1.4.2 CPU heatsink and fan assembly installation .................

1.5 System memory .........................................................................

1.5.1 Overview .......................................................................

1.5.2 Memory congurations ..................................................

1.5.3 Installing a DIMM ..........................................................

1.5.4 Removing a DIMM ........................................................

1.6 Expansion slots ..........................................................................

1.6.1 Installing an expansion card .........................................

1.6.2 Conguring an expansion card .....................................

1.6.3 PCI slot .........................................................................

1.6.4 PCI Express 2.0 x1 slots ...............................................

1.7 Jumpers ......................................................................................

1.6.5 PCI Express 3.0/2.0 x16 slots .......................................

1.8 Connectors .................................................................................

1.8.1 Rear panel connectors ..................................................

1.8.2 Internal connectors .......................................................

1.9 Onboard LEDs ............................................................................

1-1

1-2

1-5

1-5

1-5

1-6

1-7

1-8

1-9

1-10

1-12

1-14

1-14

1-14

1-20

1-20

1-21

1-21

1-21

1-21

1-21

1-22

1-22

1-23

1-23

1-25

1-32

iii

Contents

1.10 Software support ........................................................................ 1-33

1.10.1 Installing an operating system ......................................

1.10.2 Support DVD information ..............................................

®

1.10.3 Intel

BIOS information

2.1 Managing and updating your BIOS ............................................ 2-1

2.1.1 ASUS Update utility ........................................................

2.1.2 ASUS EZ Flash 2 ............................................................

2.1.3 ASUS CrashFree BIOS 3 utility ......................................

2.1.4 ASUS BIOS Updater .......................................................

2.2 BIOS setup program ....................................................................

BIOS menu screen ......................................................................... 2-7

2.3 Main menu ..................................................................................

2.3.1 System Language [English] ..........................................

2.3.2 System Date [Day xx/xx/xxxx] .......................................

2.3.3 System Time [xx:xx:xx] .................................................

2.3.4 Security .........................................................................

2.4 Ai Tweaker menu ........................................................................

2.4.1 ASUS MultiCore Enhancement [Enabled] ....................

2.4.2 Memory Frequency [Auto] .............................................

2.4.3 GPU Boost [OK] ............................................................

2.4.4 DRAM Timing Control ...................................................

2.4.5 CPU Power Management .............................................

2.5 Advanced menu .........................................................................

2.5.1 CPU Conguration ........................................................

2.5.2 PCH Conguration ........................................................

2.5.3 SATA Conguration .......................................................

2.5.4 System Agent Conguration .........................................

2.5.5 AMT Conguration ........................................................

2.5.6 USB Conguration ........................................................

2.5.7 Onboard Devices Conguration ....................................

2.5.8 APM ..............................................................................

2.5.9 Network Stack ...............................................................

SBA support ........................................................ 1-34

1-33

1-33

2-1

2-2

2-3

2-4

2-6

2-10

2-10

2-10

2-10

2-10

2-12

2-12

2-12

2-13

2-13

2-16

2-17

2-18

2-19

2-20

2-21

2-22

2-23

2-24

2-25

2-25

iv

Contents

2.6 Monitor menu ............................................................................. 2-26

2.6.1 CPU Temperature / MB Temperature

2.6.2 CPU / Chassis / Power Fan Speed ..............................

2.6.3 CPU Q-Fan Control [Enabled] ......................................

2.6.4 Chassis Q-Fan Control [Enabled] .................................

2.6.5 CPU Voltage, 3.3V Voltage, 5V Voltage, 12V Voltage ..

2.6.6 Anti Surge Support [Enabled] .......................................

2.7 Boot menu ..................................................................................

2.7.1 Bootup NumLock State [On] .........................................

2.7.2 Full Screen Logo [Enabled] ...........................................

2.7.3 Wait for ‘F1’ If Error [Enabled] .......................................

2.7.4 Option ROM Messages [Force BIOS] ...........................

2.7.5 Setup Mode [EZ Mode] .................................................

2.7.6 UEFI/Legacy Boot [Enabled both UEFI and Legacy] ....

2.7.7 PCI ROM Priority [Legacy ROM] ..................................

2.7.8 Boot Option Priorities ....................................................

2.7.9 Boot Override ................................................................

2.8 Tools menu .................................................................................

2.8.1 ASUS EZ Flash 2 Utility ................................................

2.8.2 ASUS O.C. Prole .........................................................

2.8.3 ASUS SPD Information .................................................

2.9 Exit menu ....................................................................................

[xxxºC/xxxºF] ...... 2-26

2-26

2-27

2-27

2-28

2-28

2-29

2-29

2-29

2-30

2-30

2-30

2-30

2-30

2-30

2-30

2-31

2-31

2-31

2-31

2-32

Appendices

Notices .......................................................................................................A-1

ASUS contact information .......................................................................A-3

v

Safety information

Electrical safety

•

To prevent electrical shock hazard, disconnect the power cable from the electrical 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 x it by yourself. Contact a qualied service

•
technician or your retailer.

Operation safety

Before installing the motherboard and adding components, carefully read all the manuals

•
that came with the package.

Before using the product, ensure 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 be exposed to moisture.

Place the product on a stable surface.

•

If you encounter technical problems with the product, contact a qualied service

•
technician or your retailer.

About this guide

This user guide contains the information you need when installing and conguring 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. It includes descriptions of the switches, jumpers, and connectors on the
motherboard.

• Chapter 2: BIOS information

This chapter discusses changing system settings through the BIOS Setup menus.
Detailed descriptions fo the BIOS parameters are also provided.

vi

Where to nd 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 yers,

that may have been added by your dealer. These documents are not part of the
standard package.

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
completing a task.

CAUTION: Information to prevent damage to the components when
completing a task

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

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

Typography

Bold text Indicates a menu or an item to select.

Italics

<Key> Keys enclosed in the less-than and greater-than sign

<Key1> + <Key2> + <Key3> If you must press two or more keys simultaneously, the key

Used to emphasize a word or a phrase.

means that you must press the enclosed key.

Example: <Enter> means that you must press the Enter or
Return key.

names are linked with a plus sign (+).

vii

P8B75-M LX PLUS specications summary

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

/ Celeron® 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.) / 2000(O.C.) /1800 (O.C.) / 1600 /

1333 / 1066 MHz, non-ECC, un-buffered memory

Dual-channel memory architecture

* Refer to www.asus.com for the latest Memory QVL (Qualied 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 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

Expansion slots 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 Gigabit LAN controller

Audio 6+2 Channels Realtek® ALC887-VD High Denition 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 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)

viii

(continued on the next page)

P8B75-M LX PLUS specications summary

ASUS unique features

ASUS Exclusive Features:

- ASUS GPU Boost

- ASUS USB 3.0 Boost

- Network iControl

- ASUS AI Suite II

- AI Charger

- ASUS Anti-Surge Protection

- ASUS UEFI BIOS

ASUS Quiet Thermal Solution:

- ASUS Fan Xpert

ASUS EZ DIY:

- ASUS CrashFree BIOS 3

- ASUS EZ Flash 2

- ASUS MyLogo 2™

Other features

- 100% All high-quality conductive polymer capacitors

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

3 x Audio jacks

Internal connectors/
switches/ buttons

1 x USB 3.0 connector supports additional 2 USB 3.0 ports

2 x USB 2.0 connectors support additional 4 USB 2.0 ports

5 x SATA 3.0 Gb/s connectors

1 x SATA 6.0 Gb/s connector

1 x CPU fan connector

1 x Chassis fan connectors

1 x Front panel audio connector (AAFP)

1 x System panel connector

1 x Speaker connector

1 x 24-pin ATX power connector

1 x 4-pin ATX 12V power connector

(continued on the next page)

ix

P8B75-M LX PLUS specications summary

BIOS features 128 Mb Flash ROM, AMI BIOS, PnP, DMI2.0, WfM2.0, SM BIOS 2.5,

Manageability

Accessories 1 x Serial ATA 3.0Gb/s cable

Support DVD Drivers

Form factor

* Specications are subject to change without notice.

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 6.0Gb/s cable

1 x I/O shield

1 x User Manual

1 x Support DVD

ASUS utilities

ASUS Update

Anti-virus software (OEM version)

MicroATX form factor: 9.6”x 6.9” (24.4cm x 17.5cm)

x

Product introduction

1.1 Special features

1.1.1 Product 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 (2
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 efcient CPUs in the world.

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(O.C.) / 1866(O.C.) /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(O.

C.) / 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.

1

ASUS P8B75-M LX PLUS

1-1

1.1.2 ASUS Exclusive features

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.

ASUS UEFI BIOS

Flexible and Easy BIOS Interface

ASUS UEFI BIOS offers the rst 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 frequently accessed settings.

- ASUS DRAM SPD (Serial Presence Detect) information for accessing

memory information, detecting faulty DIMMs, and helping with difcult

POST situations.

1-2

Chapter 1: Product introduction

Ai Charger

Ai Charger is a unique fast-charging software which supports iPods,
iPhones, and iPads.

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

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

USB 3.0 Boost

With USB 3.0 Boost technology, a USB device’s transmission speed

is signicantly increased, adding to an already impressive 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 exible 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 MyLogo 2™

Personalize your system by turning your favorite photos into 256-color

boot logos.

ASUS CrashFree BIOS 3

ASUS CrashFree BIOS 3 is an auto-recovery tool that allows you to

restore a corrupted BIOS le using the bundled support DVD or a USB
ash disk that contains the BIOS le.

ASUS P8B75-M LX PLUS

1-3

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 proles offer exible controls

of fan speed to achieve a quiet and cool environment.

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 conguring proles through the intutive user interface. Within
the prole, programs can be pre-scheduled to run at a specic 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 Anti-Surge Protection

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

C.P.R. (CPU Parameter Recall)

The BIOS C.P.R. feature automatically restores CPU default settings
when the system crashes 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

This motherboard is European Union´s Energy-related Products (ErP)

ready, and ErP requires products to meet certain energy efciency

requirements with regard to energy consumption. This is in line with

ASUS’ vision of creating environment-friendly and energy-efcient

products through product design and innovation aimed at reducing
carbon footprint and mitigating environmental impact.

1-4

Chapter 1: Product introduction

1.2 Before 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.

1.3 Motherboard overview

Before you install the motherboard, study the conguration of your chassis to ensure that the
motherboard ts.

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

1.3.1 Placement direction

When installing the motherboard, 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.

ASUS P8B75-M LX PLUS

1-5

P8B75-M LX PLUS

1.3.2 Screw 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

1-6

Chapter 1: Product introduction

1.3.3 Motherboard layout

P8B75-M LX PLUS

PCIEX16_1

PCIEX1_1

PCIEX1_2

PCI1

AAFP

EATXPWR

CPU_FAN

CHA_FAN

Lithium Cell

CMOS Power

Super

I/O

ALC
887

KBMS_USB34

64Mb
BIOS

64Mb
BIOS

SB_PWR

CLRTC

17.5cm(6.9in)

24.4cm(9.6in)

Intel

®

B75

DDR3 DIMM_A1 (64bit, 240-pin module)

DDR3 DIMM_B1 (64bit, 240-pin module)

SATA6G_1 SATA3G_4 SATA3G_2

SATA3G_5 SATA3G_3 SATA3G_1

AUDIO

USB3_12

LAN_USB12

LGA1155

USB3_34

DRCT

F_PANEL

SPEAKER

USB56 USB78

RTL

8111F

ATX12V

VGA

DVI

1 12 3 4

912 811 101314

2

5

6

7

5

ASUS P8B75-M LX PLUS

1-7

1.3.4 Layout contents

Connectors/Jumpers/Slots/LED Page

1. CPU and chassis fan connectors (4-pin CPU_FAN, 4-pin CHA_FAN) 1-27

2. ATX power connectors (24-pin EATXPWR, 4-pin ATX12V) 1-26

3. Intel® LGA1155 CPU socket 1-9

4. DDR3 DIMM slots 1-14

5. Intel® B75 Serial ATA 3.0Gb/s connectors (7-pin SATA3G_1~5 [blue]) 1-29

6. Intel® B75 Serial ATA 6.0Gb/s connectors (7-pin SATA6G_1 [gray]) 1-30

7. Onboard LED (SB_PWR) 1-32

8. Speaker connector (4-pin SPEAKER) 1-29

9. System panel connector (10-1 pin F_PANEL) 1-28

10. USB 3.0 connector (20-1 pin USB3_34) 1-30

11. DRCT Connector 1-31

12. USB 2.0 connectors (10-1 pin USB56, USB78) 1-31

13. Clear RTC RAM (3-pin CLRTC) 1-22

14. Front panel audio connector (10-1 pin AAFP) 1-25

1-8

Chapter 1: Product introduction

1.4 Central Processing Unit (CPU)

Right

P8B75-M LX PLUS

P8B75-M LX PLUS CPU socket LGA1155

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

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.

ASUS P8B75-M LX PLUS

1-9

1.4.1 Installing the CPU

A

B

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

1

2

3

1-10

Chapter 1: Product introduction

A

B

C

4

5

ASUS P8B75-M LX PLUS

1-11

1.4.2 CPU 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

B

A

B

A

3

2

4

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Chapter 1: Product introduction

To uninstall the CPU heatsink and fan assembly

1

2

A

B

B

A

ASUS P8B75-M LX PLUS

1-13

1.5 System memory

P8B75-M LX PLUS

P8B75-M LX PLUS 240-pin DDR3 DIMM sockets

DIMM_A1

DIMM_B1

1.5.1 Overview

This motherboard comes with two Double Data Rate 3 (DDR3) Dual Inline Memory Module
(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 gure illustrates the

location of the DDR3 DIMM sockets:

Channel Sockets

Channel A DIMM_A1

Channel B DIMM_B1

1.5.2 Memory congurations

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 conguration. Any excess
memory from the higher-sized channel is then mapped for single-channel operation.

• Due to Intel

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

• Always install DIMMs with the same CAS latency. For optimal compatibility, we
recommend that you install memory modules of the same version or date code (D/C)
from the same vendor. Check with the retailer to get the correct memory modules.

• Due to the memory address limitation on 32-bit Windows
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

- Install a 64-bit Windows

®

3rd generation processors' behavior, DDR3 2250 (and above)/2133/1866

®

OS, when you install 4GB

®

motherboard.

OS if you want to install 4GB or more on the

®

OS.

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Chapter 1: Product introduction