Asus P8B75-M User Manual
Motherboard
P8B75-M LE
P8B75-M LE PLUS
ii
E7329
First Edition (V1)
April 2012
Copyright © 2012 ASUSTeK COMPUTER INC. All Rights Reserved.
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iii
Contents
Safety information ...................................................................................... vi
About this guide ......................................................................................... vi
P8B75-M LE Series specications 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 congurations ..................................................
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 Conguring 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 Conguration ........................................................
2-17
v
Contents
2.5.2 PCH Conguration ........................................................ 2-18
2.5.3 SATA Conguration .......................................................
2-19
2.5.4 System Agent Conguration .........................................
2-20
2.5.5 AMT Conguration ........................................................
2-20
2.5.6 USB Conguration ........................................................
2-21
2.5.7 Onboard Devices Conguration ....................................
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. Prole .........................................................
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 qualied 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 qualied service
technician or your retailer.
About this guide
This user guide contains the information you need when installing and conguring 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 specications 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 (Qualied
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 Denition 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 specications 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
* Specications 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 specications 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
efcient 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 Denition 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 difcult
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 efciently 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
signicantly 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 efcient
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 efciency
requirements in regards to energy consumptions. This is in line with
ASUS vision of creating environment-friendly and energy-efcient
products through product design and innovation to reduce carbon
footprint of the product and thus mitigate environmental impacts.
1-6 Chapter 1: Product introduction
P8B75-M LE
1.5 Motherboard overview
Before you install the motherboard, study the conguration 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
P8B75-M LE
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.
A
B
ASUS P8B75-M LE Series 1-11
A
B
C
5
4
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 congurations
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 efcient 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 conguration. 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.
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