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.
ii
Contents
Notices ....................................................................................................... viii
Safety information ...................................................................................... ix
About this guide .......................................................................................... x
Maximus Extreme specications summary ............................................ xii
This device complies with Part 15 of the FCC Rules. Operation is subject to the
following two conditions:
•
This device may not cause harmful interference, and
•
This device must accept any interference received including interference that
may cause undesired operation.
This equipment has been tested and found to comply with the limits for a
Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with manufacturer’s
instructions, may cause harmful interference to radio communications. However,
there is no guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television reception,
which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following
measures:
•
Reorient or relocate the receiving antenna.
•
Increase the separation between the equipment and receiver.
•
Connect the equipment to an outlet on a circuit different from that to which the
receiver is connected.
•
Consult the dealer or an experienced radio/TV technician for help.
The use of shielded cables for connection of the monitor to the graphics card is
required to assure compliance with FCC regulations. Changes or modications
to this unit not expressly approved by the party responsible for compliance
could void the user’s authority to operate this equipment.
Canadian Department of Communications Statement
This digital apparatus does not exceed the Class B limits for radio noise emissions
from digital apparatus set out in the Radio Interference Regulations of the
Canadian Department of Communications.
This class B digital apparatus complies with Canadian ICES-003.
viii
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 adpater or extension cord.
These devices could interrupt the grounding circuit.
•
Make sure 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, make sure 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.
This symbol of the crossed out wheeled bin indicates that the product (electrical,
electronic equipment, and mercury-containing button cell battery) should not
be placed in municipal waste. Check local regulations for disposal of electronic
products.
ix
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: Hardware information
This chapter lists the hardware setup procedures that you have to perform
when installing system components. It includes description of the switches,
jumpers, and connectors on the motherboard.
• Chapter 3: Powering up
This chapter describes the power up sequence and ways of shutting down
the system.
• Chapter 4: BIOS setup
This chapter tells how to change system settings through the BIOS Setup
menus. Detailed descriptions of the BIOS parameters are also provided.
• Chapter 5: Software support
This chapter describes the contents of the support CD that comes with the
motherboard package and the software.
• Chapter 6: ATI CrossFire™ support
This chapter describes the ATI CrossFire™ feature and shows the graphics
card installation procedures.
• Appendix: CPU features
The Appendix describes the CPU features and technologies that the
motherboard supports as well as the debug code table for the LCD Poster.
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.
x
Conventions used in this guide
To make sure that you perform certain tasks properly, take note of the following
symbols used throughout this manual.
DANGER/WARNING: Information to prevent injury to yourself
when trying to complete a task.
CAUTION: Information to prevent damage to the components
when trying to complete a task.
IMPORTANT: Instructions that you MUST follow to complete a
task.
NOTE: Tips and additional information to help you complete a
task.
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>
CommandMeans that you must type the command exactly
as shown, then supply the required item or value
enclosed in brackets.
Example: At the DOS prompt, type the command line:
afudos /i[lename]
afudos /iMaximus-Extreme.ROM
xi
Maximus Extreme specications summary
CPU LGA775 socket for Intel® Core™2 Extreme /
ChipsetIntel® X38 / ICH9R with Intel® Fast Memory Access
System Bus1600 / 1333 / 1066 / 800 MHz
Memory
Expansion Slots3 x PCIe Gfx slot, support dual PCIe2.0 x16 or
CrossFire™ TechnologySupport ATI CrossFire™ graphics cards
StorageSouthbridge
LANDual Gigabit LAN controllers, both featuring AI NET2
High Denition AudioSupremeFX II Audio Card
IEEE 13942 x 1394a ports (1 port onboard; 1 port at back I/O)
USB12 x USB 2.0/1.1 ports (6 ports at mid-board, 6 ports at
Core™2 Quad/ Core™2 Duo / Pentium® Extreme /
Pentium® D / Pentium® 4 Processors
Support Intel® next generation 45nm Multi-Core CPU
Compatible with Intel® 06/05B/05A processors
* Refer to www.asus.com for Intel CPU support list
- AI Overclocking (intelligent CPU frequency tuner)
- AI Booster Utility
- O.C. Prole
Overclocking protection:
- COP EX (Component Overheat Protection -EX)
- Voltiminder LED
- ASUS C.P.R. (CPU Parameter Recall)
LCD Poster
EL I/O
Onboard Switches: Power / Reset / Clr CMOS
Q-Connector
Q-Fan Plus
ASUS EZ Flash 2
ASUS CrashFree BIOS 3
ASUS MyLogo 3™
1 x Optical + 1 x Coaxial S/PDIF Out
2 x External SATA
2 x LAN (RJ45) port
6 x USB 2.0/1.1 ports
1 x IEEE1394a port
1 x Clr CMOS switch
ports
1 x Floppy disk drive connector
1 x IDE connector for two devices
6 x SATA connectors
8 x Fan connectors (1 x CPU/ 1 x Power/ 3 x Chassis/
3 x Optional)
3 x Thermal sensor connectors
1 x IEEE1394a connector
1 x S/PDIF Out connector
1 x Chassis Intrusion connector
24-pin ATX Power connector
8-pin ATX 12V Power connector
1 x En/Dis-able Clr CMOS slide switch
1 x EL I/O Shield connector
(continued on the next page)
xiii
Maximus Extreme specications summary
BIOS Features16 Mb AMI BIOS, PnP, DMI2.0, WfM2.0, SM BIOS 2.4,
ManageabilityWOL by PME, WOR by PME, Chassis Intrusion, PXE
AccessoriesFusion Block System Accessory
SoftwareThe hottest 3D game: S.T.A.L.K.E.R
Form FactorATX Form Factor, 12”x 10.6” (30.5cm x 26.9cm)
ACPI 2.0a Multi-Language BIOS
DIY Pedestal
ASUS Optional Fan
3 in 1 ASUS Q-connector kit
UltraDMA 133/100/66 cable
Floppy disk drive cable
Serial ATA cables
Serial ATA power cables
2-port USB2.0 module + IEEE1394a module
EL I/O Shield
Thermal sensor cables
Cable ties
User's manual
Support DVD:
Drivers
ASUS PC Probe II
ASUS Update
ASUS AI Suite
Futuremark® 3DMark® 06 Advanced Edition
Kaspersky Anti-Virus software
*Specications are subject to change without notice.
xiv
This chapter describes the motherboard
features and the new technologies
it supports.
1.3 Special features ............................................................................
1-1
1-2
ASUS Maximus Extreme
1.1 Welcome!
Thank you for buying an ASUS® Maximus Extreme motherboard!
The motherboard delivers a host of new features and latest technologies, making it
another standout in the long line of ASUS quality motherboards!
Before you start installing the motherboard, and hardware devices on it, check the
items in your package with the list below.
1.2 Package contents
Check your motherboard package for the following items.
Motherboard ASUS Maximus Extreme
I/O modules USB 2.0 module + IEEE 1394a module
Cables Ultra DMA 133/100/66 cable
Floppy disk drive cable
Serial ATA cables
Serial ATA power cables
Thermal sensor cables
Accessories Fusion Block System Accessory
EL I /O shield
LCD Poster
ASUS Optional Fan
3-in-1 ASUS Q-Connector Kit
Cable ties
DIY Pedestal
DVD/CD ASUS motherboard support DVD
The hottest game: S.T.A.L.K.E.R
Documentation User guide
If any of the above items is damaged or missing, contact your retailer.
ASUS Maximus Extreme1-1
1.3 Special features
1.3.1 ROG intelligent Performance & Overclocking features
Crosslinx
Crosslinx is a unique technology utilizing a dedicated special graphics controller to
optimize PCIe allocation with x16, x8, x8 lanes. Such architecture eliminates the x4
bottleneck found on competing x16, x16, x4 solutions. Hence, the Crosslinx is able
to provide faster graphics performance.
Fusion Block System
The Fusion Block System is a more efcient thermal solution compared to
competing followers with complicated looks. It is a hybrid thermal design that
combines the ROG’s renowned heatpipe design with the additional ability to
connect to a water cooling system. By taking the entire integrated solution into
design considerations, the user can enjoy exceptional thermal improvement to
Northbridge, Southbridge, Crosslinx, and even VRM with a single connection. The
Fusion Block System is the most versatile, efcient, and advanced thermal system
there is on a motherboard.
Component Overheat Protection -EX (COP EX)
The COP EX allows overclockers to increase chipset voltages without the worries
of overheating. It can also be used to monitor and save an overheating GPU.
The COP EX allows more freedom and less constraint for maximum performance
achievement.
Frequency LED
Worried that no one knows when you’ve overclocked your system to the max? Let
the motherboard do the talking! The onboard Frequency LED highlights when your
system is under extreme overclocking or normal states � allowing you to show off
your O.C. skills.
Voltiminder LED
In the persuit of extreme performance, overvoltage adjustment is critical but risky.
Acting as the “red zone” of a tachometer, the Voltiminder LED displays the voltage
status for CPU, NB, SB, and Memory in a intuitive color-coded fashion. The
Voltiminder LED allows quick voltage monitoring for overclockers. See pages 2-1
to 2-3 for details.
1-2Chapter 1: Product Introduction
CPU Level Up
Enjoy up to 40% more performance! Overclock immediately with OC prole
presets. Much more than simple frequency settings, this prole gives gamers
comprehensive and detailed tuning to frequencies, voltagies, and even timings to
create a real professional level of overclocking conguration. See pages 4-17 and
5-33 for details.
2-Phase DDR3
With the embedded 2-Phase DDR3, this motherboard allows users to reach higher
memory frequencies and enjoy better performance. Compared with only one phase
solutions, this motherboard ensures longer power component lifespans and higher
overclockability due to cooler temperatures and better efciency.
3rd Generation 8 Phase Power Design
Longer Life & Higher Efciency!
With power efciency so important to operating temperatures, ASUS' 3rd
generation 8-phase VRM design leads the industry with its 95% power efciency.
High quality power components such as low RDS (on) MOSFETs for minimum
switching loss & lower temperatures, Ferrite core chokes with lower hysteresis
loss, and high quality Japanese-made conductive polymer capacitors all add up
to ensure longer component life and lower power loss - creating more energy
efciency.
Loadline Calibration
The Loadline calibration ensures stable and optimal CPU voltage when heavy
loading.
Extreme Tweaker
This feature allows you to ne tune the CPU/memory voltage and gradually
increase the memory Front Side Bus (FSB) and PCI Express frequency at 1MHz
increment to achieve maximum system performance.
AI Booster
The ASUS AI Booster allows you to overclock the CPU speed in Windows
environment without the hassle of booting the BIOS.
ASUS Maximus Extreme1-3
ASUS O.C. Prole
The motherboard features the ASUS O.C. Prole that allows users to conveniently
store or load multiple BIOS settings. The BIOS settings can be stored in the
CMOS or a separate le, giving users freedom to share and distribute their favorite
settings. See page 4-40 for details.
C.P.R. (CPU Parameter Recall)
The C.P.R. feature of the motherboard BIOS allows automatic re-setting to the
BIOS default settings in case the system hangs due to overclocking. When the
system hangs due to overclocking, 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 default setting for each parameter.
1.3.2 ROG unique features
Supreme FX II features
Supreme FX II extends all the features of the 1st generation and places a shielding
to enhancethe sound quality. It also lights up the model name with stylish LEDs.
Noise Filter
This feature detects repetitive and stationary noises (non-voice signals) like
computer fans, air conditioners, and other background noises then eliminates
it in the incoming audio stream while recording. See page 5-15 and 5-20 for
details.
LCD Poster
The LCD Poster uses an external panel to smartly display the error message of the
physical system during the Power-On Self Test (POST) to inform you the boot error
instead of the “code name.”
Onboard Switches
A power-on button, a reset button, and a clear CMOS button are onboard to
provide overclockers and gamers the convenience of ne-tuning performance
when working on a bare (open-case) system. Press the power-on button to wake
up the system, the reset button to reboot, and the clear CMOS button to clear
setup information when the system hangs due to overclocking. See page 2-40 for
details.
1-4Chapter 1: Product Introduction
ASUS Q-Fan plus technology
The ASUS Q-Fan plus technology smartly adjusts the CPU and chassis fan
1 speeds according to the system loading to ensure quiet, cool, and efcient
operation. See pages 4-33, 4-34 and 5-31 for details.
Optional Fan
The optional fan is specically designed to provide sufcient airow over the CPU
power modules and chipset area when water-cooling or passive-cooling is utilized,
ensuring effective heat dissipation for the entire system. See page 2-41 for details.
(for water-cooling/passive-cooling only)
ASUS Multi-language BIOS
The multi-language BIOS allows you to select the language of your choice from the
available options. The localized BIOS menus allow easier and faster conguration.
See page 4-12 for details.
ASUS MyLogo 3
This new feature present in the motherboard allows you to personalize and add
style to your system with customizable boot logos. See page 5-9 for details.
ASUS Quiet Thermal Solution
ASUS Quiet Thermal solution makes system more stable and enhances the
overclocking capability.
ASUS EPU
The ASUS EPU utilizes innovative technology to digitally monitor and tune the
CPU power supply with improved VR responses in heavy or light loadings. It
automatically provides power for higher performance or improve efciency by 7%
when the PC is running low intensity applications. Working together with AI Gear 3,
this can help you attain the best possible power efciency and energy savings up
to 20% to help save the environment. See page 5-29 for details.
AI Nap
With AI Nap, the system can continue running at minimum power and noise
when you are temporarily away. To wake the system and return to the OS
environment, simply click the mouse or press a key. See page 5-30 for
details.
ASUS Maximus Extreme1-5
Fanless Design - Stack Cool 2
ASUS Stack Cool 2 is a fan-less and zero-noise cooling solution that lowers
the temperature of critical heat generating components. The motherboard
uses a special design on the printed circuit board (PCB) to dissipate heat
these critical components generate.
ASUS EZ DIY
ASUS EZ DIY feature collection provides you easy ways to install computer
components, update the BIOS or back up your favorite settings.
ASUS Q-Connector
ASUS Q-Connector allows you to easily connect or disconnect the chassis
front panel cables to the motherboard. This unique module eliminates the
trouble of connecting the system panel cables one at a time and avoiding
wrong cable connections. See page 2-39 for details.
ASUS CrashFree BIOS 3
The ASUS CrashFree BIOS 3 allows users to restore corrupted BIOS data
from a USB ash disk containing the BIOS le. See page 4-8 for details.
ASUS EZ Flash 2
EZ Flash 2 is a user-friendly BIOS update utility. Simply press the predened
hotkey to launch the utility and update the BIOS without entering the OS.
Update your BIOS easily without preparing a bootable diskette or using an
OS-based ash utility. See pages 4-5 and 4-39 for details.
1-6Chapter 1: Product Introduction
1.3.3 Product highlights
Republic of Gamers
The Republic of Gamers consists only the best of the best. We offer the best
hardware engineering, the fastest performance, the most innovating ideas, and we
welcome the best gamers to join in. In the Republic of Gamers, mercy rules are
only for the weak, and bragging rights means everything. We believe in making
statements and we excel in competitions. If your character matches our trait, then
join the elite club, make your presence felt, in the Republic of Gamers.
Intel® Quad-core Processor ready
This motherboard supports the latest Intel® Quad-core processors in the LGA775
package and Intel’s next-generation 45nm multi-core processors. It is excellent for
multi-tasking, multi-media and enthusiastic gamers with 1333/1066/800 MHz FSB.
Intel® Quad-core processor is one of the most powerful CPU in the world. See
page 2-9 for details.
Intel® Core™2 Duo/ Intel® Core™2 Extreme CPU support
This motherboard supports the latest Intel® Core™2 processor in the LGA775
package and Intel’s next-generation 45nm multi-core processors. With the new
Intel® Core™ microarchitecture technology and 1333/1066/800 MHz FSB, the
Intel® Core™2 is one of the most powerful and energy efcient CPUs in the world.
See page 2-8 for details.
Intel® X38 Chipset
The Intel® X38 Express Chipset is the latest chipset designed to support 8GB of
dual-channel DDR3 1333/1066/800 architecture, 1333/1066/800 FSB (Front Side
Bus), dual PCI Express 2.0 x16 graphics, and multi-core CPUs. With the specially
included Intel® Fast Memory Access technology, available memory bandwidth
usage is optimized and memory access latency is reduced—allowing faster
memory speed.
ASUS Maximus Extreme1-7
PCIe 2.0
This motherboard supports the latest PCIe 2.0 device for twice the current speed
and bandwidth. This enhances system performance while still providing backward
compatibility to PCIe 1.0 devices. See pages 2-20 and 2-22 for details.
DDR3 memory support
The motherboard supports DDR3 memory that features data transfer rates of
1333 / 1066 / 800 MHz to meet the higher bandwidth requirements of the latest
3D graphics, multimedia, and Internet applications. The dual-channel DDR3
architecture doubles the bandwidth of your system memory to boost system
performance. Furthermore, this motherboard does not restrict the memory size
across two channels. Users may install different memory size DIMMs into the two
channels and enjoy dual-channel and single-channel functions at the same time.
This new feature optimizes the use of available memory size.
ATI CrossFire™ Technology
ATI’s CrossFire™ boosts image quality along with rendering speed, eliminating the
need to scale down screen resolution to get high quality images. CrossFire™ allows
higher antialiasing, anisotropic ltering, shading, and texture settings. Adjust your
display congurations, experiment with the advanced 3D settings, and check the
effects with a real-time 3D-rendered previews within ATI Catalyst™ Control Center.
Serial ATA 3.0 Gb/s technology and SATA-On-The-Go
This motherboard supports the next-generation hard drives based on the Serial ATA
(SATA) 3Gb/s storage specication, delivering enhanced scalability and doubling
the bus bandwidth for high-speed data retrieval and saves. The external SATA port
located at the back I/O provides smart setup and hot-plug functions. Easily backup
photos, videos and other entertainment contents to external devices. See page
2-27 for details.
Dual RAID solution
The Intel® X38 chipset incorporates six Serial ATA connectors with high
performance RAID 0, 1, 5 and 10 functions. Making this motherboard an ideal
solution to enhance hard disk performance and data back up protection without the
cost of add-on cards. See page 2-30 for details.
1-8Chapter 1: Product Introduction
IEEE 1394a support
The IEEE 1394a interface provides high speed digital interface for audio/video
appliances such as digital television, digital video camcorders, storage peripherals
& other PC portable devices. See pages 2-28 and 2-32 for details.
S/PDIF digital sound ready
This motherboard provides convenient connectivity to external home theater audio
systems via coaxial and optical S/PDIF-out (SONY-PHILIPS Digital Interface)
jacks.It allows to transfer digital audio without converting to analog format and
keeps the best signal quality. See pages 2-28 and 2-37 for details.
Dual Gigabit LAN solution
The integrated dual Gigabit LAN design allows a PC to serve as a network
gateway for managing trafc between two separate networks. This capability
ensures rapid transfer of data from WAN to LAN without any added arbitration or
latency. See page 2-26 for details.
High Denition Audio
Enjoy high-end sound quality on your PC! The onboard 8-channel HD audio (High
streaming technology that simultaneously sends different audio streams to different
destinations. You can now talk to your partners on the headphone while playing
multi-channel network games. See pages 2-27 for details.
Green ASUS
This motherboard and its packaging comply with the European Union’s Restriction
on the use of Hazardous Substances (RoHS). This is in line with the ASUS vision
of creating environment-friendly and recyclable products/packaging to safeguard
consumers’ health while minimizing the impact on the environment.
ASUS Maximus Extreme1-9
1-10Chapter 1: Product Introduction
This chapter lists the hardware setup
procedures that you have to perform
when installing system components. It
includes description of the jumpers and
connectors on the motherboard.
information
Hardware
2
Chapter summary
2
2.1 Before you proceed ..................................................................... 2-1
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.
• Use a grounded wrist strap or touch a safely grounded object or
a metal object, such as the power supply case, before handling
components 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, and/or components.
Onboard LEDs
The motherboard comes with LEDs that indicate the voltage conditions of CPU,
memory, northbridge, southbridge and FSB frenquency. You may adjust the
voltages in BIOS. There are also an LED for hard disk drive activity and an onboard
switch for power status. For more information on voltage adjustment, refer to 4.4
Extreme Tweaker menu
1. CPU LED
The CPU LED has two voltage displays: CPU Voltage and CPU PLL Voltage;
you can select the voltage to display in BIOS. Refer to the illustration below
for the location of the CPU LED and the table below for LED denition.
CPU Voltage
CPU PLL Voltage
ASUS Maximus Extreme2-1
Normal (green)High (yellow)Crazy (red)
1.10000~1.500001.50625~1.693751.70000~
1.50000~1.600001.62000~1.800001.82000~
2. Memory LED
MAXIMUS EXTREME
®
MAXIMUS EXTREME DDR LED
DDR_CRAZY
DDR_HIGH
DDR_NORMAL
MAXIMUS EXTREME
®
MAXIMUS EXTREME North/South Bridge LED
NB_CRAZY
NB_HIGH
NB_NORMAL
SB_CRAZY
SB_HIGH
SB_NORMAL
Refer to the illustration below for the location of the memory LED and the
table below for LED denition.
Normal (green)High (yellow)Crazy (red)
DRAM Voltage
1.50~1.901.92~2.302.32~3.04
3. Northbridge/Southbridge LEDs
The northbridge and southbridge LEDs each have two different voltage
displays. The northbridge LED displays either the North Bridge Voltage or
the FSB Termination Voltage. The southbridge LED shows either the South
Bridge Voltage or the SB 1.5V Voltage. You can select the voltage to display
in BIOS. Refer to the illustration below for the location of the northbridge/
southbridge LEDs and the table below for LED denition.
Normal (green)High (yellow)Crazy (red)
North Bridge Voltage
FSB Termination Voltage
South Bridge Voltage
SB 1.5V Voltage
2-2Chapter 2: Hardware information
1.25~1.491.51~1.731.73~
1.20~1.401.42~1.601.62~
1.050~1.1251.150~1.1751.200~
1.50~1.601.65~1.851.90~
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