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Product warranty or service will not be extended if: (1) the product is repaired, modied or altered, unless
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Where the applicable license entitles you to the source code of such software and/or other additional data,
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ii
Contents
Safety information ...................................................................................................... vi
About this guide ........................................................................................................ vii
P9X79 LE specications summary ........................................................................... ix
• 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 devices on it, 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 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.
vi
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: 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 4: Software support
This chapter describes the contents of the support DVD that comes with the
motherboard package and the software.
• Chapter 5: Multiple GPU technology support
This chapter describes how to install and congure multiple ATI® CrossFireX™ and
NVIDIA® SLI™ graphics cards.
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.
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
IMPORTANT: Instructions that you MUST follow to complete a task. .
NOTE: Tips and additional information to help you complete a task.
Typography
Bold textIndicates a menu or an item to select.
Italics
<Key>Keys enclosed in the less-than and greater-than sign means that you must
<Key1> + <Key2> + <Key3>If you must press two or more keys simultaneously, the key names are linked
Used to emphasize a word or a phrase.
press the enclosed key.
Example: <Enter> means that you must press the Enter or Return key.
with a plus sign (+).
viii
P9X79 LE specications summary
CPU2nd Generation Intel® Core™ i7 Processor family for the LGA
Chipset
Memory8 x DIMM, max. 64GB, DDR3 2400(O.C.) / 2133(O.C.) /
Expansion slots2 x PCI Express 3.0 x16 slots (Dual at x16/ x16 mode, Triple at
memory
Quad channel memory architecture
Supports Intel® Extreme Memory Prole (XMP)
** Hyper DIMM support is subject to the physical characteristics
of individual CPUs.
** Refer to www.asus.com for the Memory QVL (Qualied
Vendors Lists).
x16/ x16/ x8)
1 x PCI Express 3.0 x16 slot (PCIe x16_3 at x8 mode)
2 x PCI Express 2.0 x1 slots
1 x PCI slot
* This motherboard is ready to support PCIe 3.0 SPEC. Functions
will be available when using PCIe 3.0-compliant devices. Please
refer to www.asus.com for updated details.
Supports AMD® Quad-GPU CrossFireX™ Technology
- 2 x SATA 6 Gb/s ports with RAID 0, 1, 5 and 10 support
- 4 x SATA 3 Gb/s ports with RAID 0, 1, 5 and 10 support
ASMedia® 1061 SATA controller
- 2 x eSATA 6Gb/s ports
- 2 x USB 3.0/2.0 ports at mid-board for front panel support
- 2 x USB 3.0/2.0 ports at back panel (Blue)
Intel® X79 Express Chipset
- 14 x USB 2.0/1.1 ports
(6 ports at mid-board; 8 ports at back panel)
- Support 192khz / 24bit BD Lossless Sound
- BD Audio Layer Content Protection
- Supports Jack-Detection, Multi-Streaming and
Front Panel Jack-Retasking
- Optical S/PDIF Out port at back I/O
(continued on the next page)
ix
P9X79 LE specications summary
ASUS exclusive
overclocking features
ASUS Unique FeaturesASUS Dual Intelligent Processors 3
Precision Tweaker 2:
- vCore: Adjustable CPU voltage at 0.005V increment
- vTTCPU: Adjustable I/O voltage at 0.00625V increment
- vCCSA: 255-step system agent voltage control
- vDRAM Bus: 160-step Memory voltage control
- vPCH: 96-step Chipset voltage control
- vCPU_PLL: 48-step CPU & PCH PLL voltage control
SFS (Stepless Frequency Selection):
- BCLK/PEG frequency tuning from 80MHz up to 300MHz at
0.1MHz increment
Overclocking Protection:
- ASUS C.P.R.(CPU Parameter Recall)
with New DIGI+ Power Control:
CPU Power
- Industry leading Digital 6+2 Phase Power Design
- CPU Power Utility
DRAM Power
- Industry leading Digital 2+2 Phase Power Design
- DRAM Power Utility
ASUS TPU
- Auto Tuning, TurboV
ASUS EPU
- EPU Utility
ASUS Exclusive Features:
- ASUS UEFI BIOS EZ Mode featuring friendly graphics user
- USB 3.0 Boost
- MemOK!
- Remote GO!
- AI Suite II
- Ai Charger
ASUS Quiet Thermal Solution:
- ASUS Fanless Design: Stylish Heat-sink solution
- ASUS Fan Xpert+
ASUS EZ DIY:
- USB BIOS Flashback with USB BIOS Flashback Wizard for
EZ BIOS download scheduling
- ASUS O.C. Prole
- ASUS MyLogo 2
- Percision Tweaker 2
- ASUS CrashFree BIOS 3
- ASUS EZ Flash 2
- DirectKey
- Multi-language BIOS
ASUS Q-Design:
- ASUS Q-Shield
- ASUS Q-Slot
- ASUS Q-DIMM
- ASUS Q-LED (CPU, DRAM, VGA, Boot Device LED)
- ASUS Q-Connector
interface
(continued on the next page)
x
P9X79 LE specications summary
Back panel I/O ports1 x PS/2 Keyboard port
Internal I/O connectors3 x USB 2.0/1.1 connectors support additional 6 USB ports
ManageabilityWfM 2.0, DMI 2.0, WOL by PME, WOR by PME, PXE
Support DVD contentsDrivers
Form factorATX form factor: 12 in. x 9.6 in. (30.5 cm x 24.4 cm)
*Specications are subject to change without notice.
1 x PS/2 Mouse port
2 x USB 3.0/2.0 ports (blue)
8 x USB 2.0/1.1 ports
1 x LAN (RJ-45) port
1 x Optical S/PDIF Out port
2 x eSATA 6Gb/s ports (red)
8-channel Audio I/O
2 x SATA 6Gb/s connectors
4 x SATA 3Gb/s connectors
1 x CPU Fan connector (4-pin)
1 x CPU Optional Fan connector (4-pin)
4 x Chassis Fan connectors (4-pin)
1 x Front panel audio connector (AAFP)
1 x COM connector
1 x TPM connector
1 x S/PDIF Out header
1 x Clear CMOS jumper
1 x 24-pin EATX Power connector
1 x 8-pin EATX 12V Power connector
1 x System Panel (Q-Connector)
1 x MemOK! button
1 x DirectKey button
1 x DRCT header
1 x USB BIOS Flashback button
SM BIOS 2.6, ACPI 2.0a, Multi-language BIOS,
ASUS EZ Flash 2, ASUS CrashFree BIOS 3
ASUS Utilities
ASUS Update
Anti-virus software (OEM version)
xi
xii
Chapter 1
User Manual
Chapter 1: Product introduction
1.1 Welcome!
Thank you for buying an ASUS® P9X79 LE 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.
ASUS P9X79 LE motherboardUser guideSupport DVD
2 x Serial ATA 6.0 Gb/s cables2 x Serial ATA 3.0 Gb/s cables1 x ASUS Q-Shield
1 x ASUS SLI™ bridge
connector
• If any of the above items is damaged or missing, contact your retailer.
• The illustrated items above are for reference only. Actual product specications may
vary with different models.
1 x 2-in-1 ASUS Q-Connector kit
Chapter 1
ASUS P9X79 LE1-1
1.3 Special features
1.3.1 Product highlights
Chapter 1
2nd Generation Intel® Core™ i7 Processor family for the LGA 2011 Socket
This motherboard supports the latest 2nd Generation Intel® Core™ i7 Processor Family in
LGA2011 package, with memory and PCI Express controllers integrated to quad-channel
(8 DIMMs) DDR3 memory and 40 PCI Express 3.0 lanes. This provides great graphics
performance. 2nd Generation Intel® Core™ i7 Processor Family is one of the most powerful
and energy efcient CPUs in the world.
Intel® X79 Express Chipset
The Intel® X79 Express Chipset is the latest single-chipset design that supports the new
socket 2011 2nd Generation Intel® Core™ i7 Processor Family. It improves performance by
utilizing serial point-to-point links, allowing for increased bandwidth and stability. Additionally,
the X79 comes with 2 SATA 6Gb/s and 4 SATA 3Gb/s ports for faster data retrieval, doubling
the bandwidth of current bus systems.
3-Way SLI™ and Quad-GPU CrossFireX™ Support
Both SLI and CrossreX architectures work awlessly on new ASUS X79 boards, with PCI
Express slots designed to accommodate the power of up to three current graphics cards.
Whether for professional graphics work, heavy duty multimedia or dedicated gaming, more
than ample graphics power can be applied whenever needed.
Quad-Channel DDR3 2400(O.C.)/2133(O.C.)/1866/1600/1333/1066 MHz Support
The motherboard supports DDR3 memory that features data transfer rates of 2400(O.
C.)/2133(O.C.)/1866/1600/1333/1066 MHz to meet the higher bandwidth requirements of
the latest operation system, 3D graphics, multimedia, and Internet applications. The quadchannel DDR3 architecture quadruple the bandwidth of your system memory to boost system
performance.
* Due to CPU behavior, DDR3 2200/2000/1800 MHz memory module will run at DDR3 2133/1866/1600
MHz frequency as default.
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. The P9X79 LE affords greater convenience to high speed connectivity.
PCIe 3.0 Ready
The latest PCI Express bus standard delivers improved encoding for twice the performance
of current PCIe 2.0. Total bandwidth for a x16 link reaches a maximum of 32GB/s, double
the 16GB/s of PCIe 2.0 (in x16 mode). PCIe 3.0 provides users unprecedented data speeds,
combined with the convenicnce and seamless transition offered by complete backward
compatibility with PCIe 1.0 and PCIe 2.0 devices. It is a must-have feature PC users aiming
to improve and optimize graphics performance, as well as have the latest, most future-proof
technology.
* This motherboard is ready to support PCIe 3.0 SPEC. Functions will be available when using PCIe
3.0-compliant devices. Please refer to www.asus.com for updated details.
1-2Chapter 1: Product Introduction
1.3.2 Dual Intelligent Processors 3 with New DIGI+ Power Control
The world’s rst Dual Intelligent Processors from ASUS pioneered twin onboard chips
- TPU (TurboV Processing Unit) and EPU (Energy Processing Unit). Third generation
Dual Intelligent Processors with New DIGI+ Power Control include two digital voltage
regulator modules (VRMs). An all-new digital controller now allows ultra-precise DRAM
tuning in addition to CPU voltage control. This evolution of innovative and industry-leading
ASUS technology provides super-accurate voltage tuning for better efciency, stability and
performance.
New DIGI+ Power Control
All-New Digital Power Control for both CPU and DRAM
ASUS X79 motherboards include New DIGI+ Power Control with two digital voltage regulator
modules (VRMs), including an all-new DRAM controller that allows ultra-precise memory
tuning in addition to CPU voltage control. This evolution of innovative, industry-leading ASUS
technology provides super-accurate voltages for better efciency, stability and performance.
Best in class power efciency and stability
Two critical components work perfectly together to match digital power signal (SVID) requests
from the CPU, with ultra-fast sensing and response to efciently deliver the right level of
power on demand. Accurate power reduces wasteful imprecision, and provides more stable
CPU Vcore voltages.
Increased CPU and DRAM overclocking range
With programmable digital controllers onboard, users can adjust CPU and DRAM PWM
voltages and frequencies for various overclocking scenarios, with accurate input through
UEFI BIOS tuning or the exclusive ASUS interface. System performance can also be
customized with specic CPU and DRAM power controls, including new VCCSA load line
calibration for increased voltage range, greater VCCSA current capability, and up to 30%
more capacitance. This proprietary design, with its precise yet exible power adjustments,
increases overclocking headroom to push performance to its full potential.
Chapter 1
TPU
Unleash your performance with ASUS’ simple onboard switch or AI Suite II utility. The TPU
chip offers precise voltage control and advanced monitoring through Auto Tuning and TurboV
functions. Auto tuning offers a user friendly way to automatically optimize the system for fast,
yet stable clock speeds, while TurboV enables unlimited freedom to adjust CPU frequencies
and ratios for optimized performance in diverse situations.
EPU
Tap into the world’s rst real-time PC power saving chip through a simple onboard switch or
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 P9X79 LE1-3
1.3.3 ASUS Exclusive Features
Chapter 1
USB BIOS Flashback
USB BIOS Flashback offers the most convenient way to ash the BIOS ever! It allows
overclockers to try new BIOS versions easily, without even entering their existing BIOS or
operating system. Just plug in USB storage and push the dedicated button for 3 seconds,
and the BIOS is automatically ashed using standby power. Worry-free overclocking for the
ultimate convenience!
USB 3.0 Boost
New ASUS USB 3.0 Boost technology supports UASP (USB Attached SCSI Protocol), the
latest USB 3.0 standard. With USB 3.0 Boost, USB device transmission speed is signicantly
increased by up to 170%, adding to an already impressively fast USB 3.0 transfer speed.
USB 3.0 Boost provides a user-friendly graphical interface, which instantly accelerates the
transfer speeds for USB 3.0 peripherals with exclusive ASUS device auto-detect settings.
DirectKey
DirectKey allows you to conveniently go into the BIOS setup with the press of a button. With
this feature, you can enter the BIOS anytime without having to press the <Del> key during
POST. It also allows you to shut down or turn on your computer and directly enter the BIOS
during boot-up.
Remote GO!
Remote GO! links PCs, tablets, smartphones and TVs wirelessly together through an existing
LAN cable or router. It provides a seamless environment for a futuristic connected lifestyle
with three useful functions: DLNA Media Hub, Remote Desktop and File Transfer.
DLNA Media Hub: Enjoy HD video, music and photos stored in the PC streaming to your
DLNA devices via Wi-Fi connectivity.
Remote Desktop: Operate and control your PC in real-time from a smartphone or tablet for
complete comfort and convenience.
File Transfer: Send and share les between your PC and smart devices* with only a right
click on the mouse.
*iPad/iPhone can send, but not receive les from the PC.
AI Suite II
With its user-friendly interface, ASUS AI Suite II consolidates all exclusive ASUS features
into one simple-to-use package with an elegant design theme. It allows users to supervise
overclocking, energy management, fan speeds, voltage, and sensor readings. This all-inone software offers diverse and easy to use functions, with no need to switch back and forth
between different utilities.
MemOK!
MemOK! quickly ensures memory boot compatibility. This remarkable memory rescue tool
requires a mere push of a button to patch memory issues. MemOK! determines failsafe
settings and dramatically improves your system boot success.
1-4Chapter 1: Product Introduction
1.3.4 ASUS Quiet Thermal Solution
ASUS Fanless Design—Heat-sink solution
The stylish heatsink offers 0dB cooling for a quiet PC environment. Attractive design
enhances the look of the board and case, while temperatures in the chipset and power phase
areas stay lower through high efciency heat exchange. Combining usability and aesthetics,
the stylish ASUS heatsink gives users an extremely silent and cool experience with elegant
design.
ASUS Fan Xpert+
Hardware-level ASUS Fan Xpert+ allows users to independently adjust both CPU and case
fan speeds with multiple dedicated controllers based on different ambient temperatures,
climate conditions and system loads. Built-in proles offer exible automatic and manual fan
speed controls to achieve a quiet and cool computing environment.
1.3.5 ASUS EZ DIY
ASUS UEFI BIOS
ASUS UEFI BIOS offers the rst mouse-controlled graphical BIOS designed with selectable
modes, providing a user-friendly interface that goes beyond 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 info for enhanced system control
- F12 BIOS snapshot hotkey for sharing UEFI setup info and troubleshooting
- New F3 Shortcut for most accessed info
- ASUS DRAM SPD (Serial Presence Detect) Information for accessing memory info,
detecting faulty DIMMs and helping with difcult POST situations.
Chapter 1
ASUS Q-Design
ASUS Q-Design enhances your DIY experience. All of Q-LED, Q-Slot, and Q-DIMM design
speed up and simplify the DIY process!
ASUS Q-Shield
The specially designed ASUS Q-Shield does without the usual "ngers" - making it
convenient and easy to install. With better electric conductivity, it ideally protects your
motherboard against static electricity and shields it against Electronic Magnetic Interference
(EMI).
ASUS P9X79 LE1-5
ASUS Q-Connector
ASUS Q-Connector allows you to easily connect or disconnect the chassis front panel cables
Chapter 1
to the motherboard. This unique module eliminates the trouble of connecting the system
panel cables one at a time and avoiding wrong cable connections.
ASUS EZ-Flash 2
ASUS EZ Flash 2 is a user-friendly utility that allows you to update the BIOS without using a
bootable oppy disk or an OS-based utility.
1.3.6 Other special features
eSATA 6Gb/s Ready
eSATA 6Gb/s can let users enjoy 2X faster transfer rates on external SATA 6Gb/s devices.
ASUS provides two extra ports with enhanced scalability, faster data retrieval, and double the
bandwidth of current bus systems for extra speed and accessibility.
ErP Ready
The motherboard is European Union’s Energy-related Products (ErP) ready, and ErP requires
products to meet certain energy efciency requirement 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.
1-6Chapter 1: Product Introduction
Chapter 2
Chapter 2: Hardware information
2.1 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.
ASUS P9X79 LE2-1
2.2 Motherboard overview
2.2.1 Motherboard layout
Chapter 2
Refer to
2.2.8 Internal connectors
information about rear panel connectors and internal connectors.
2-2Chapter 2: Hardware information
and
2.3.11 Rear panel connection
for more
Layout contents
Connectors/Jumpers/SlotsPage
1. DDR3 DIMM slots2-5
2. ATX power connectors (24-pin EATXPWR, 8-pin EATX12V)
3. LGA2011 CPU socket
4. CPU, CPU OPT, Chassis fan connectors (4-pin CPU_FAN,
4-pin CPU_OPT, 4-pin CHA_FAN1/2/3/4)
5. MemOK!
6. USB 3.0 connector (20-1 pin USB3_34)
®
7. Intel
X79 Serial ATA 6.0 Gb/s connectors
(7-pin SATA6G_1/2 [gray])
®
8. Intel
X79 Serial ATA 3.0 Gb/s connectors
(7-pin SATA3G_3–6 [blue])
9. Standby Power LED
10. Clear RTC RAM (3-pin CLRTC)
11. Direct Connector (2-pin DRCT)
12. System panel connector (20-8 pin PANEL)
13. TPM connector
(20-1 pin TPM)2-25
14. USB 2.0 connectors (10-1 pin USB910, USB1112, USB1314)
15. BIOS Flashback switch
16.
Serial port connector (10-1 pin COM1) 2-26
17. DirectKey button
18. Front panel audio connector (10-1 pin AAFP)
19.
Digital audio connector (4-1 pin SPDIF_OUT)2-26
2-29
2-4
2-27
2-17
2-25
2-22
2-23
2-19
2-21
2-28
2-30
2-24
2-19
2-18
2-28
Chapter 2
ASUS P9X79 LE2-3
2.2.2 Central Processing Unit (CPU)
The motherboard comes with a surface mount LGA2011 socket designed for the 2nd
Generation Intel® Core™ i7 Processor Family.
Chapter 2
Ensure that all power cables are unplugged 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
LGA2011 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.
2-4Chapter 2: Hardware information
2.2.3 System memory
The motherboard comes with eight Double Data Rate 3 (DDR3) Dual Inline Memory Modules
(DIMM) slots.
A DDR3 module is notched differently from a DDR or DDR2 module. DO NOT install a DDR
or DDR2 memory module to the DDR3 slot.
Recommended memory congurations
Chapter 2
ASUS P9X79 LE2-5
Memory congurations
You may install 1GB, 2GB, 4GB, and 8GB unbuffered, and non-ECC DDR3 DIMMs into the
DIMM sockets.
Chapter 2
• You may install varying memory sizes in Channel A, B, C, and D. The system maps
the total size of the lower-sized channel for the dual-channel, triple-channel, or quadchannel conguration. Any excess memory from the higher-sized channel is then
mapped for single-channel operation.
• Due to CPU behavior, DDR3 2200/2000/1800 MHz memory module will run at DDR3
2133/1866/1600 MHz frequency as default.
• According to Intel
DIMMs of 8GB (or above). ASUS will update QVL once the DIMMs are available on
the market.
• According to Intel CPU spec, DIMM voltage below 1.65V is recommended to protect
the CPU.
• 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.
However, there are differences in memory support specications on 64-bit Windows
OS. Please visit www.Microsoft.com for more details.
For more details, refer to the Microsoft® support site at
http://support.microsoft.com/kb/929605/en-us.
• This motherboard does not support DIMMs made up of 512Mb (64MB) chips or less
(Memory chip capacity counts in Megabit, 8 Megabit/Mb = 1 Megabyte/MB).
®
spec, the max. 64GB memory capacity can be supported with
• 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
frequency adjustment.
• For system stability, use a more efcient memory cooling system to support a full
memory load (4 DIMMs or above) or overclocking condition.