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Motherboard

P8B75-M LE
P8B75-M LE PLUS

ii

E7329

First Edition (V1)
April 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, modied or altered, unless
such repair, modication 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.

SPECIFICATIONS AND INFORMATION CONTAINED IN THIS MANUAL ARE FURNISHED FOR
INFORMATIONAL USE ONLY, AND ARE SUBJECT TO CHANGE AT ANY TIME WITHOUT NOTICE,
AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY ASUS. ASUS ASSUMES NO
RESPONSIBILITY OR LIABILITY FOR ANY ERRORS OR INACCURACIES THAT MAY APPEAR IN THIS
MANUAL, INCLUDING THE PRODUCTS AND SOFTWARE DESCRIBED IN IT.

Products and corporate names appearing in this manual may or may not be registered trademarks or

copyrights of their respective companies, and are used only for identication or explanation and to the
owners’ benet, without intent to infringe.

Offer to Provide Source Code of Certain Software

This product contains copyrighted software that is licensed under the General Public License (“GPL”),
under the Lesser General Public License Version (“LGPL”) and/or other Free Open Source Software
Licenses. Such software in this product is distributed without any warranty to the extent permitted by the
applicable law. Copies of these licenses are included in this product.

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
(2) for the cost of reproduction and shipment, which is dependent on the preferred carrier and the location

where you want to have it shipped to, by sending a request to:

ASUSTeK Computer Inc.
Legal Compliance Dept.
15 Li Te Rd.,
Beitou, Taipei 112
Taiwan

In your request please provide the name, model number and version, as stated in the About Box of the
product for which you wish to obtain the corresponding source code and your contact details so that we
can coordinate the terms and cost of shipment with you.

The source code will be distributed WITHOUT ANY WARRANTY and licensed under the same license as
the corresponding binary/object code.

This offer is valid to anyone in receipt of this information.
ASUSTeK is eager to duly provide complete source code as required under various Free Open Source

Software licenses. If however you encounter any problems in obtaining the full corresponding source
code we would be much obliged if you give us a notication to the email address gpl@asus.com, stating
the product and describing the problem (please DO NOT send large attachments such as source code
archives, etc. to this email address).

iii

Contents

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

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

P8B75-M LE Series specications 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 ………………………………………………………

1-8

1.6 Central Processing Unit (CPU) ……………………………………………

1-9

1.6.1 Installing the CPU …………………………………………………

1-10

1.6.2 CPU heatsink and fan assembly installation ……………..

1-12

1.7 System memory ……………………………………………………………….

1-14

1.7.1 Overview ……………………………………………………………..

1-14

1.7.2 Memory congurations …………………………………………..

1-14

1.7.3 Installing a DIMM ………………………………………………….

1-19

1.7.4 Removing a DIMM ………………………………………………..

1-19

1.8 Expansion slots ………………………………………………………………..

1-20

1.8.1 Installing an expansion card …………………………………..

1-20

1.8.2 Conguring an expansion card ……………………………….

1-20

1.8.3 PCI slots ………………………………………………………………

1-20

1.8.4 PCI Express x4 slot ……………………………………………….

1-20

1.8.5 PCI Express 3.0/2.0 x16 slot …………………………………..

1-20

1.9 Jumpers …………………………………………………………………………..

1-21

1.10 Connectors ………………………………………………………………………

1-22

1.10.1 Rear panel connectors …………………………………………..

1-22

1.10.2 Internal connectors ……………………………………………….

1-24

1.11 Onboard switches …………………………………………………………….

1-30

iv

Contents

1.12 Onboard LEDs …………………………………………………………………. 1-31

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 CPU bus speed: DRAM speed ratio mode [Auto] ………

2-12

2.4.2 Memory Frequency [Auto] ………………………………………

2-13

2.4.3 iGPU Max. Frequency [Auto] ………………………………….

2-13

2.4.4 EPU Power Saving Mode [Disabled] ……………………….

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

2.4.8

DIGI+ VRM ………………………………………………………….. 2-14

2.4.9 CPU Voltage [Offset Mode] …………………………………….

2-15

2.4.10 iGPU Voltage [Offset Mode] ……………………………………

2-16

2.4.11 DRAM Voltage [Auto] …………………………………………….

2-16

2.4.12 VCCSA Voltage [Auto] …………………………………………..

2-16

2.4.13 VCCIO Voltage [Auto] ……………………………………………

2-16

2.4.14 PCH Voltage [Auto] ……………………………………………….

2-16

2.4.15 CPU PLL Voltage [Auto] …………………………………………

2-16

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

2-17

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

2-17

v

Contents

2.5.2 PCH Conguration ……………………………………………….. 2-18

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

2-19

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

2-20

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

2-20

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

2-21

2.5.7 Onboard Devices Conguration ………………………………

2-21

2.5.8 APM ……………………………………………………………………

2-22

2.5.9 Network Stack ………………………………………………………

2-23

2.6 Monitor menu …………………………………………………………………..

2-24

2.6.1 CPU Temperature / MB Temperature

[xxxºC/xxxºF] …… 2-25

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

5

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

2-25

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

2-26

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

2-26

2.6.6 Anti Surge Support [Enabled] …………………………………

2-26

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

2-27

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

2-27

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

2-27

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

2-27

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

2-28

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

2-28

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

2-28

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

2-28

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

2-28

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

2-28

2.8 Tools menu ………………………………………………………………………

2-29

2.8.1 ASUS EZ Flash 2 Utility …………………………………………

2-29

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

2-29

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

2-29

2.9 Exit menu …………………………………………………………………………

2-30

Appendices

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

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

vi

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 x it by yourself. Contact a qualied 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 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.

• 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.

vii

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.

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

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

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.

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>

viii

P8B75-M LE Series specications summary

(continued on the next page)

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 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: HDMI, DVI-D, and D-Sub ports

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

(P8B75-M LE only)
Maximum shared memory of 1 GB

Expansion slots 1 x PCI Express 3.0/2.0 x16 slot

1 x PCI Express 2.0 x16 slot (x4 mode)
2 x PCI slots

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 (P8B75-M LE

only)
Realtek® 8111E-VL-CG PCIe Gigabit LAN controller (P8B75-M LE

PLUS only)

Audio VIA® VT1708S 8-channel* 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 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)

ix

P8B75-M LE Series specications summary

ASUS unique features ASUS Exclusive Features:

— ASUS EPU

— ASUS GPU Boost

— ASUS USB 3.0 Boost

— Network iControl

— MemOK!

— ASUS AI Suite II

— Ai Charger

— ASUS Anti-Surge Protection

— ASUS UEFI BIOS featuring graphics user interface

— All Solid Capacitors (P8B75-M LE PLUS only)
ASUS Quiet Thermal Solution:

— ASUS Q-Fan 2

— 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 port (purple)

1 x PS/2 mouse port (green)
1 x HDMI port (P8B75-M LE only)
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/
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 (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 MemOK! button

(continued on the next page)

x

* Specications are subject to change without notice.

BIOS features 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

Manageability

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

Accessories 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

Support DVD Drivers

ASUS utilities
ASUS Update
Anti-virus software (OEM version)

Form factor

MicroATX form factor: 9.6”x 8.0” (24.4cm x 20.3cm)

P8B75-M LE Series specications summary

ASUS P8B75-M LE Series 1-1

Chapter 1

Product introduction

Motherboard ASUS P8B75-M LE Series 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.

1.3 Special features

1.3.1 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 (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

efcient CPUs in the world.

1.1 Welcome!

Thank you for buying an ASUS® P8B75-M LE Series 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.

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

• ASUS P8B75-M LE Series motherboards include P8B75-M LE and P8B75-M LE PLUS
two models. The layout varies with models. The layout illustrations in this user manual
are for P8B75-M LE only.

1.2 Package contents

Check your motherboard package for the following items.

1-2 Chapter 1: Product introduction

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 1600 / 1333 / 1066MHz support

The motherboard supports DDR3 memory that features data transfer

rates of 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.

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.

HDMI Support

High Denition Multimedia Surface (HDMI) is a set of digital video

standards that delivers multi-channel audio and uncompressed digital
video via a single cable. Supporting HDCP copy protection such as HD
DVD and Blu-ray discs, HDMI provides you with the highest quality home
theater experience.

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 P8B75-M LE Series 1-3

1.3.2 Innovative ASUS features

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 most accessed information

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

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

POST situations.

DIGI+ VRM — Digital Power Design

All-new digital CPU power controls work perfectly together to match
digital power signal (SVID) requests from the CPU, with ultra-fast sensing

and response efciently delivering precision power. Accurate delivery

reduces waste, and provides more stable CPU Vcore voltages. Users
can adjust CPU PWM voltages and frequencies for various overclocking
scenarios, with accurate input through UEFI BIOS tuning or the exclusive
ASUS interface. This proprietary design increases overclocking
headroom to push performance to its full potential.

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 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 exible frequency

adjustments. It easily delivers stable system-level upgrades for every use.

1-4 Chapter 1: Product introduction

MemOK!

MemOK! quickly ensures memory boot compatibility. This remarkable
memory rescue tool requires a mere push of the button to patch memory
issues. MemOK! determines failsafe settings and dramatically improves
your system boot success. Get your system up and running in no time.

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).

ASUS Q-Fan 2

The ASUS Q-Fan 2 technology intelligently adjusts both CPU and chassis

fan speeds according to system loading to ensure quiet, cool and efcient

operation.

ASUS EPU

Tap into the world’s rst real-time PC power saving chip through the AI
Suite II utility. Get total system-wide energy optimization by automatically

detecting current PC loadings and intelligently moderating power
consumption. This also reduces fan noise and extends component
longevity.

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

ASUS EZ Flash 2

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

ASUS P8B75-M LE Series 1-5

1.4 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.

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 efciency

requirements in regards to energy consumptions. This is in line with

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

products through product design and innovation to reduce carbon
footprint of the product and thus mitigate environmental impacts.

1-6 Chapter 1: Product introduction

1.5 Motherboard overview

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

1.5.1 Placement 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.

1.5.2 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

ASUS P8B75-M LE Series 1-7

1.5.3 Motherboard layout

P8B75-M LE PLUS

P8B75-M LE PLUS

PCIEX16_1

PCIEX16_2

PCI2

PCI1

AAFP

EATXPWR

CPU_FAN

CHA_FAN

Lithium Cell

CMOS Power

Super

I/O

VIA

VT1708S

DIGI

+VRM

ATX12V

KBMS

64Mb
BIOS

64Mb
BIOS

CLRTC

20.3cm(8.0in)

24.4cm(9.6in)

Intel

®

B75

DDR3 DIMM_A1 (64bit, 240-pin module)

DDR3 DIMM_A2 (64bit, 240-pin module)

SATA6G_1

SATA3G_5

SATA3G_1

SATA3G_2

SATA3G_3

SATA3G_4

AUDIO

USB34

USB3_12

ASM
1442

LAN_USB12

SPDIF_OUT

DVI_VGA

DRAM_LED

MemOK!

LGA1155

USB3_34

F_PANEL

SPEAKER

RTL

8111E

COM1

LPT

USB78 USB56

SB_PWR

1 42 13

1213 101117 16 15 1418

6

2

7

8

9

5

1-8 Chapter 1: Product introduction

1.5.4 Layout contents

Connectors/Jumpers/Slots/LED Page Connectors/Jumpers/Slots/LED Page

1. CPU and chassis fan connectors (4-pin
CPU_FAN, 3-pin CHA_FAN)

1-26 10. Intel® B75 Serial ATA 6.0Gb/s connectors

(7-pin SATA6G_1 [gray])

1-28

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

1-25 11. System panel connector (10-1 pin F_PANEL) 1-27

3. Intel® LGA1155 CPU socket 1-9 12. Speaker connector (4-pin SPEAKER) 1-27

4. DDR3 DIMM slots 1-14 13. USB 2.0 connectors (10-1 pin USB56, USB78) 1-29

5. DRAM LED (DRAM_LED) 1-31 14 Clear RTC RAM (3-pin CLRTC) 1-21

6. MemOK! switch 1-30 15. LPT connector (26-1 pin LPT) 1-26

7. USB 3.0 connector (20-1 pin USB3_34) 1-29 16. Digital audio connector (4-1 pin SPDIF_OUT) 1-24

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

1-28 17. Serial port connector (10-1 pin COM1) 1-25

9. Onboard LED (SB_PWR) 1-31 18 Front panel audio connector (10-1 pin AAFP) 1-24

P8B75-M LE

PCIEX16_1

PCIEX16_2

PCI2

PCI1

AAFP

EATXPWR

CPU_FAN

CHA_FAN

Lithium Cell

CMOS Power

Super

I/O

VIA

VT1708S

DIGI

+VRM

ATX12V

KBMS

HDMI

64Mb
BIOS

64Mb
BIOS

CLRTC

20.3cm(8.0in)

24.4cm(9.6in)

Intel

®

B75

DDR3 DIMM_A1 (64bit, 240-pin module)

DDR3 DIMM_A2 (64bit, 240-pin module)

SATA6G_1

SATA3G_5

SATA3G_1

SATA3G_2

SATA3G_3

SATA3G_4

AUDIO

USB34

USB3_12

ASM
1442

LAN_USB12

SPDIF_OUT

DVI_VGA

DRAM_LED

MemOK!

LGA1155

USB3_34

F_PANEL

SPEAKER

RTL

8111F

COM1

LPT

USB78 USB56

SB_PWR

1 42 13

1213 101117 16 15 1418

6

2

7

8

9

5

ASUS P8B75-M LE Series 1-9

1.6 Central 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.

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.

Right

P8B75-M LE

P8B75-M LE CPU socket LGA1155

1-10 Chapter 1: Product introduction

1.6.1 Installing the CPU

1

2

3

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

ASUS P8B75-M LE Series 1-11

1-12 Chapter 1: Product introduction

1.6.2 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

2

B

A

A

B

3

1

4

ASUS P8B75-M LE Series 1-13

A

B

B

A

To uninstall the CPU heatsink and fan assembly

2

1

1-14 Chapter 1: Product introduction

P8B75-M LE

P8B75-M LE 240-pin DDR3 DIMM sockets

DIMM_A1

DIMM_B1

1.7 System memory

1.7.1 Overview

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 gure illustrates the location of the DDR3 DIMM sockets:

Channel Sockets

Channel A DIMM_A1

Channel B DIMM_B1

1.7.2 Memory congurations

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

• 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 efcient memory cooling system to support a full

memory load (2 DIMMs) or overclocking condition.

• 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.

• 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.