ASUS B75MA User Manual
B75M-A
Motherboard
E8116
First Edition V1
January 2013
Copyright © 2013 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, modied or altered, unless
such repair, modication 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 identication or explanation and to the
owners’ benet, 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 notication 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).
ii
Contents
Safety information ...................................................................................... vi
About this guide ......................................................................................... vi
B75M-A specications summary ............................................................ viii
Package contents ....................................................................................... xi
Chapter 1: 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 congurations ..................................................
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 Conguring 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 slot .........................................
1.8 Connectors .................................................................................
1.8.1 Rear panel connectors ..................................................
1.8.2 Internal connectors .......................................................
1-1
1-1
1-4
1-4
1-4
1-5
1-6
1-7
1-8
1-9
1-11
1-13
1-13
1-14
1-18
1-18
1-19
1-19
1-19
1-19
1-19
1-20
1-20
1-23
1-23
1-25
iii
Contents
1.9 Onboard LEDs ............................................................................ 1-32
1.10 Software support ........................................................................
1.10.1 Installing an operating system ......................................
1.10.2 Support DVD information ..............................................
®
1.10.3 Intel
Chapter 2: 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 Memory Frequency [Auto] .............................................
2.4.2 EPU Power Saving Mode [Disabled] ............................
2.4.3 DRAM Timing Control ...................................................
2.4.4 CPU Power Management .............................................
2.4.5
2.5 Advanced menu .........................................................................
2.5.1 CPU Conguration ........................................................
2.5.2 PCH Conguration ........................................................
2.5.3 SATA Conguration .......................................................
2.5.4 System Agent Conguration .........................................
2.5.5 AMT Conguration ........................................................
2.5.6 USB Conguration ........................................................
2.5.7 Onboard Devices Conguration ....................................
2.5.8 APM ..............................................................................
SBA support ........................................................ 1-34
DIGI+ VRM .................................................................... 2-16
1-32
1-32
1-32
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
2-15
2-18
2-18
2-20
2-21
2-21
2-22
2-23
2-24
2-24
iv
Contents
2.5.9 Network Stack ............................................................... 2-25
2.6 Monitor menu .............................................................................
2.6.1 CPU Temperature / MB Temperature
2.6.2 CPU / Chassis Fan Speed [xxxx RPM]
or [Ignore] / [N/A] ...........................................................
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 Fast Boot [Enabled] ......................................................
2.7.2 Boot Logo Display [Enabled] .........................................
2.7.3 Bootup NumLock State [On] .........................................
2.7.4 Wait for ‘F1’ If Error [Enabled] .......................................
2.7.5 Option ROM Messages [Force BIOS] ...........................
2.7.6 Interrupt 19 Capture [Disabled] .....................................
2.7.7 Setup Mode [EZ Mode] .................................................
2.7.8 CSM (Compatibility Support Module) ............................
2.7.10 Security Boot .................................................................
2.7.11 Boot Option Priorities ....................................................
2.7.12 Boot Override ................................................................
2.8 Tools menu .................................................................................
2.8.1 ASUS EZ Flash 2 Utility ................................................
2.8.2 ASUS O.C. Prole .........................................................
2.8.3 ASUS SPD Information .................................................
2.9 Exit menu ....................................................................................
[xxxºC/xxxºF] ...... 2-26
2-26
2-26
2-26
2-27
2-28
2-28
2-29
2-29
2-30
2-30
2-30
2-31
2-31
2-31
2-31
2-32
2-34
2-34
2-35
2-35
2-35
2-35
2-36
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 qualied 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 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. 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
B75M-A specications summary
CPU LGA1155 socket for Intel® 3rd / 2nd Generation Core™ i7 / i5 / i3, Pentium®
and 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 (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.
*** Intel® 3rd generation processors support DDR3 1600 MHz and higher frequency.
Graphics Integrated graphics processor
Multi-VGA output support: HDMI, DVI-D, and D-Sub ports
- Supports HDMI with max.resolution of 1920 x 1200 @60Hz
- 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 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 4 x USB 3.0 ports (2 ports at midboard, 2 ports at back panel)
8 x USB 2.0 ports (4 ports at midboard, 4 ports at back panel)
viii
(continued on the next page)
B75M-A specications summary
ASUS unique features
ASUS Exclusive Features:
- ASUS USB 3.0 Boost
- ASUS Network iControl
- ASUS AI Suite II
- ASUS 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 port (purple)
1 x PS/2 mouse port (green)
1 x HDMI port
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 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
B75M-A specications summary
BIOS features 128 Mb Flash ROM, AMI BIOS, PnP, DMI2.0, WfM2.0, SM BIOS 2.5,
Manageability
Support DVD Drivers
Form factor
Specications 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
ASUS utilities
ASUS Update
Anti-virus software (OEM version)
MicroATX form factor: 9.6”x 7.0” (24.4cm x 17.8cm)
x
Package contents
B75M-A
PCIEX16
PCIEX1_1
PCIEX1_2
PCI1
F_PANEL
SPEAKER
CLRTC
USBPW5-8
USBPW12
PS2_USBPW34
USB56
USB78
AAFP
ATX12V
EATXPWR
CPU_FAN
CHA_FAN
BATTERY
Super
I/O
ALC
887
RTL
8111F
128Mb
BIOS
SB_PWR
Intel
®
B75
DDR3 DIMM_A1 (64bit, 240-pin module)
LGA1155
DDR3 DIMM_B1 (64bit, 240-pin module)
SATA6G_1
SATA3G_5 SATA3G_3
SATA3G_4
SATA3G_1
SATA3G_2
AUDIO
KBMS
LAN1_USB12
USB34
USB3_12
HDMI
DVI_VGA
DIGI
+VRM
USB3_34
User Manual
Check your motherboard package for the following items.
ASUS B75M-A motherboard
1 x Serial ATA 3.0Gb/s cable
1 x Serial ATA 6.0Gb/s cable
1 x I/O-Shield User Guide Support DVD
• If any of the above items are damaged or missing, contact your retailer.
• The illustrated items above are for reference only. Actual product specications may
vary with different models.
xi
xii
Product introduction
1
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 It provides great graphics performance with its iGPU,
dual-channel DDR3 memory slots, and PCI Express 2.0/3.0 slots.
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 2200 (O.C.)*/ 2000 (O.C.) / 1800 (O.C.) / 1600 / 1333 / 1066
MHz support
The motherboard supports DDR3 memory that features data transfer rates of 2200 (O.C.)/
2000 (O.C.) / 1800 (O.C.) / 1600 / 1333 / 1066 MHz to boost the system’s performance, and
to meet the higher bandwidth requirements of the latest 3D graphics, multimedia, and Internet
applications.
* Intel® 3rd generation processors support DDR3 1600 MHz and higher frequency.
1.1.2 ASUS Exclusive features
Native SATA 6.0 Gb/s support
With Intel® B75 Express Chipset native support for the next-generation Serial ATA (SATA)
storage interface, this motherboard delivers up to 6.0 Gb/s data transfer rates. It also
provides enhanced scalability, faster data retrieval, and double the bandwidth of current bus
systems.
ASUS B75M-A
1-1
Complete USB 3.0 Integration
This motherboard offers you the strategic USB 3.0 accessibility for both the front and rear
panels, allowing you to experience the convenience of the latest plug and play connectivity
solution at speed up to ten times faster than USB 2.0.
PCI Express® 3.0
PCI Express® 3.0 (PCIe 3.0) is the PCI Express bus standard that provides twice the
performance and speed of PCIe 2.0. It provides an optimal graphics performance,
unprecedented data speed, and seamless transition with its complete backward compatibility
to PCIe 1.0/2.0 devices.
* Intel® 3rd generation Core™ processors support PCIe 3.0
ASUS UEFI BIOS (EZ Mode)
ASUS UEFI BIOS, a UEFI compliant architecture, offers the rst mouse-controlled intuitive
graphical BIOS interface that goes beyond the traditional keyboard-only BIOS controls,
providing you with more exibility, convenience, and easy to navigate EFI BIOS than the
traditional BIOS versions. It offers you with dual selectable modes and native support for hard
drives larger than 2.2 TB.
ASUS UEFI BIOS includes the following new features:
• F12 BIOS snapshot hotkey
• F3 Shortcut for most accessed information
• ASUS DRAM SPD (Serial Presence Detect) information detecting faulty DIMMs, and
helping with difcult POST situations.
Ai Charger
Ai Charger is a unique fast-charging software that supports iPods, iPhones, and iPads.
* Check your USB mobile device if it fully supports the BC 1.1 function.
** The actual charging speed may vary with your USB device’s conditions.
*** Ai Charger is only supported when you set the USB device wake-up jumpers to +5VSB. See section 1.7 Jumpers
for details.
USB 3.0 Boost
With USB 3.0 Boost technology, a USB device’s transmission speed is signicantly
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.
AI Suite II
With its user interface, ASUS AI Suite II integrates several ASUS utilities and allows you to
launch and operate these utilities simultaneously. It allows you to congure the overclocking
settings, adjust the frequencies and related voltages, remotely control the system via a
mobile device, and other easy-to-use helpful utilities.
1-2
Chapter 1: Product introduction
ASUS MyLogo 2™
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 Fan Xpert
ASUS Fan Xpert intelligently allows you to adjust both the CPU and chassis fan speeds
based on different ambient temperatures, resulting to a quiet and cool computing
environment.
Network iControl
Network iControl is an intuitive one-step network control center that makes it easier for you to
manage your bandwidth and allows you to set, monitor, and schedule the bandwidth priorities
for your network programs. It allows you to automatically connect to a PPPoE network for a
more convenient online experience.
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 efciency requirements with regard to energy
consumption. This is in line with ASUS’ vision of creating environment-friendly and energy-
efcient products through product design and innovation aimed at reducing carbon footprint
and mitigating environmental impact.
ASUS B75M-A
1-3
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 conguration 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.
1-4
Chapter 1: Product introduction
1.3.2 Screw holes
B75M-A
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 B75M-A
1-5
1.3.3 Motherboard layout
B75M-A
PCIEX16
PCIEX1_1
PCIEX1_2
PCI1
F_PANEL
SPEAKER
CLRTC
USBPW5-8
USBPW12
PS2_USBPW34
USB56
USB78
AAFP
ATX12V
EATXPWR
CPU_FAN
CHA_FAN
BATTERY
Super
I/O
ALC
887
RTL
8111F
128Mb
BIOS
SB_PWR
24.4cm(9.6in)
Intel
®
B75
DDR3 DIMM_A1 (64bit, 240-pin module)
LGA1155
DDR3 DIMM_B1 (64bit, 240-pin module)
SATA6G_1
SATA3G_5 SATA3G_3
SATA3G_4
SATA3G_1
SATA3G_2
AUDIO
KBMS
LAN1_USB12
USB34
USB3_12
HDMI
17.8cm(7.0in)
DVI_VGA
DIGI
+VRM
USB3_34
54321 64
7
9
8
2
1011121
14
15
13
1-6
Chapter 1: Product introduction
1.3.4 Layout contents
Connectors/Jumpers/Slots/LED Page
1. USB device wake-up (USBPW12) 1-22
2. ATX power connectors (24-pin EATXPWR, 4-pin ATX12V) 1-26
3. P/S 2 device wakeup (PS_USBPW34) 1-21
4. CPU and chassis fan connectors (4-pin CPU_FAN, 4-pin CHA_FAN) 1-27
5. Intel® LGA1155 CPU socket 1-8
6. DDR3 DIMM slots 1-13
7. Intel® B75 Serial ATA 3.0Gb/s connectors (7-pin SATA3G_1~5 [blue]) 1-29
8. Intel® B75 Serial ATA 6.0Gb/s connector (7-pin SATA6G_1 [gray]) 1-30
9. USB 3.0 connector (20-1 pin USB3_34) 1-30
10. System panel connector (10-1 pin F_PANEL) 1-28
11. Speaker connector (4-pin SPEAKER) 1-29
12. USB 2.0 connectors (10-1 pin USB56, USB78) 1-31
13. Onboard LED (SB_PWR) 1-32
14. Clear RTC RAM (3-pin CLRTC) 1-20
15. Front panel audio connector (10-1 pin AAFP) 1-25
ASUS B75M-A
1-7
1.4 Central Processing Unit (CPU)
B75M-A
B75M-A 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.
1-8
Chapter 1: Product introduction
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
ASUS B75M-A
1-9
A
B
C
4
5
1-10
Chapter 1: Product introduction
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
ASUS B75M-A
1-11
To uninstall the CPU heatsink and fan assembly
1
2
A
B
B
A
1-12
Chapter 1: Product introduction
1.5 System memory
B75M-A
B75M-A 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
ASUS B75M-A
1-13
1.5.2 Memory congurations
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 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 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
®
OS if you want to install 4GB or more on the
motherboard.
• This motherboard does not support DIMMs made up of 512 megabits (Mb) chips or
less.
• Memory modules with memory frequency higher than 2133 MHz and its corresponding
timing or the loaded X.M.P. Prole is not the JEDEC memory standard. The stability
and compatibility of these memory modules depend on the CPU’s capabilities and
other installed devices.
• The maximum 16GB memory capacity can be supported with 8GB or above DIMMs.
ASUS will update the memory QVL once the DIMMs are available in the market.
• 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.
®
OS, when you install 4GB
®
OS.
1-14
Chapter 1: Product introduction
Loading...