Asus P7P55D LE User Manual

P7P55D LE

Motherboard

E4882

First Edition V1
August 2009

Copyright © 2009 ASUSTeK Computer Inc. All Rights Reserved.

No part of this manual, including the products and software described in it, may be reproduced,
transmitted, transcribed, stored in a retrieval system, or translated into any language in any form or by any
means, except documentation kept by the purchaser for backup purposes, without the express written
permission of ASUSTeK Computer Inc. (“ASUS”).

Product warranty or service will not be extended if: (1) the product is repaired, modied or altered, unless
such repair, modication of alteration is authorized in writing by ASUS; or (2) the serial number of the

product is defaced or missing.

ASUS PROVIDES THIS MANUAL “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OR CONDITIONS OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL ASUS, ITS
DIRECTORS, OFFICERS, EMPLOYEES OR AGENTS BE LIABLE FOR ANY INDIRECT, SPECIAL,
INCIDENTAL, OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF PROFITS,
LOSS OF BUSINESS, LOSS OF USE OR DATA, INTERRUPTION OF BUSINESS AND THE LIKE),
EVEN IF ASUS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES ARISING FROM ANY
DEFECT OR ERROR IN THIS MANUAL OR PRODUCT.

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

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

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

ii

Contents

Contents ...................................................................................................... iii

Notices ......................................................................................................... vi

Safety information ..................................................................................... vii

About this guide ....................................................................................... viii

P7P55D LE specications summary ......................................................... ix

Chapter 1: Product introduction

1.1 Before you proceed ..................................................................... 1-1

1.2 Motherboard overview ................................................................. 1-2

1.2.1 Motherboard layout ......................................................... 1-2

1.2.2 Layout contents ............................................................... 1-2

1.3 Central Processing Unit (CPU) ................................................... 1-3

1.4 System memory ........................................................................... 1-8

1.4.1 Overview ......................................................................... 1-8

1.4.2 Memory congurations .................................................... 1-9

1.5 Expansion slot ............................................................................ 1-16

1.5.1 Installing an expansion card ......................................... 1-16

1.5.2 Conguring an expansion card ..................................... 1-16

1.5.3 PCI slots ........................................................................ 1-16

1.6 Jumpers ...................................................................................... 1-17

1.7 MemOK! switches ...................................................................... 1-18

1.8 Connectors ................................................................................. 1-19

1.8.1 Rear panel connectors .................................................. 1-19

1.8.2 Internal connectors ....................................................... 1-20

1.9 Installing an operating system ................................................. 1-26

1.10 Support DVD information .......................................................... 1-26

1.10.1 Running the support DVD ............................................. 1-26

Chapter 2: BIOS setup 2-1

2.1 Managing and updating your BIOS ............................................ 2-1

2.1.1 ASUS Update .................................................................. 2-1

2.1.2 ASUS EZ Flash 2 ............................................................ 2-2

2.1.3 ASUS CrashFree BIOS 3 utility ...................................... 2-3

2.2 BIOS setup program .................................................................... 2-4

Entering BIOS Setup at startup ...................................................... 2-4

Entering BIOS Setup after POST ................................................... 2-4

iii

Contents

2.3 Main menu .................................................................................... 2-4

2.3.1 SATA 1-6 ......................................................................... 2-5

2.3.2 Storage Conguration ..................................................... 2-6

2.3.3 AHCI Conguration ......................................................... 2-7

2.3.4 System Information ......................................................... 2-8

2.4 Ai Tweaker menu .......................................................................... 2-9

2.4.1 Ai Overclock Tuner ....................................................... 2-10

2.4.2 CPU Ratio Setting ........................................................ 2-10

2.4.3 Intel(R) SpeedStep(TM) Tech ...................................... 2-10

2.4.4 Intel(R) TurboMode Tech .............................................. 2-10

2.4.5 Xtreme Phase Full Power Mode ...................................2-11

2.4.6 DRAM Frequency .........................................................2-11

2.4.7 QPI Frequency ..............................................................2-11

2.4.8. DRAM Timing Control ...................................................2-11

2.4.9 CPU Differential Amplitude ........................................... 2-13

2.4.10 CPU Clock Skew .......................................................... 2-13

2.4.11 CPU Voltage Mode ....................................................... 2-13

2.4.12 IMC Voltage ................................................................ 2-14

2.4.13 DRAM Voltage ............................................................ 2-14

2.4.14 CPU PLL Voltage ......................................................... 2-14

2.4.15 PCH Voltage ................................................................ 2-14

2.4.16 DRAM DATA REF Voltage on CHA/B .......................... 2-14

2.4.17 Load-Line Calibration ................................................... 2-15

2.4.18 CPU Spread Spectrum ................................................ 2-15

2.4.19 PCIE Spread Spectrum ................................................ 2-15

2.5 Advanced menu ......................................................................... 2-16

2.5.1 CPU Conguration ........................................................ 2-16

2.5.2 North Bridge Conguration ........................................... 2-18

2.5.3 Onboard Devices Conguration .................................... 2-19

2.5.4 USB Conguration ........................................................ 2-20

2.5.5 PCIPnP ......................................................................... 2-21

2.5.6 Intel VT-d ...................................................................... 2-21

2.6 Power menu ................................................................................ 2-21

2.6.1 Suspend Mode ............................................................. 2-21

2.6.2 Repost Video on S3 Resume ........................................ 2-22

iv

2.6.3 ACPI 2.0 Support ......................................................... 2-22

2.6.4 ACPI APIC Support ...................................................... 2-22

2.6.5 EuP Ready ................................................................... 2-22

2.6.6 APM Conguration ........................................................ 2-22

2.6.7 Hardware Monitor ......................................................... 2-24

2.7 Boot menu .................................................................................. 2-25

2.7.1 Boot Device Priority ...................................................... 2-25

2.7.2 Boot Settings Conguration .......................................... 2-26

2.7.3 Security ......................................................................... 2-26

2.8 Tools menu ................................................................................. 2-28

2.8.1 ASUS O.C. Prole ......................................................... 2-28

2.8.2 AI NET 2........................................................................ 2-29

2.8.3 Express Gate ............................................................... 2-29

2.9 Exit menu .................................................................................... 2-30

v

Notices

Federal Communications Commission Statement

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 modications 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.

REACH

Complying with the REACH (Registration, Evaluation, Authorisation, and Restriction of
Chemicals) regulatory framework, we published the chemical substances in our products at
ASUS REACH website at http://green.asus.com/english/REACH.htm.

DO NOT throw the motherboard in municipal waste. This product has been designed to
enable proper reuse of parts and recycling. This symbol of the crossed out wheeled bin
indicates that the product (electrical and electronic equipment) should not be placed in
municipal waste. Check local regulations for disposal of electronic products.

DO NOT throw the mercury-containing button cell battery in municipal waste. This symbol
of the crossed out wheeled bin indicates that the battery should not be placed in municipal
waste.

vi

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 qualied service

technician or your retailer.

•

The optical S/PDIF is an optional component (may or may not be included in your

motherboard) and is dened as a CLASS 1 LASER PRODUCT.

INVISIBLE LASER RADIATION, AVOID EXPOSURE TO BEAM.

• Never dispose of the battery in re. It could explode and release harmful substances into

the environment.

• Never dispose of the battery with your regular household waste. Take it to a hazardous

material collection point.

• Never replace the battery with an incorrect battery type.

• RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE.

• DISPOSE OF USED BATTERIES ACCORDING TO THE ABOVE BATTERY-RELATED
INSTRUCTIONS.

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 qualied service

technician or your retailer.

vii

About this guide

This user guide contains the information you need when installing and conguring the

motherboard.

How this guide is organized

This guide contains the following parts:

• Chapter 1: Product introduction

This chapter describes the features of the motherboard and the new technology it
supports.

• Chapter 2: BIOS information

This chapter tells how to change system settings through the BIOS Setup menus.
Detailed descriptions of the BIOS parameters are also provided.

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 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>

viii

P7P55D LE specications summary

CPU LGA1156 socket for Intel® Core™ i7/ Core™ i5 Processors

Chipset

Memory

Expansion Slots 1 x PCI Express 2.0 x16 slot (single at x16)

Multi-GPU Support

Storage

LAN

USB

Audio

Supports Intel® Turbo Boost Technology
* Refer to www.asus.com for Intel CPU support list

Intel® P55 Express Chipset

4 x DIMM, max. 16GB, DDR3 2000(O.C.)* / 1600 / 1333 /
1066 MHz, non-ECC, un-buffered memory
Dual channel memory architecture
* Supports Intel® Extreme Memory Prole (XMP)
** Hyper DIMM support is subject to the physical
characteristics of individual CPUs.
*** Refer to www.asus.com or this user manual for the

Memory QVL (Qualied Vendors Lists)

1 x PCI Express 2.0 x16 slot (at x4 mode 2.5GT/s)
2 x PCI Express 2.0 x1 slots (2.5GT/s)
3 x PCI slots

Supports ATI® Quad-GPU CrossFireX™ Technology

Intel® P55 Express Chipset:

- 6 x SATA 3.0 Gb/s ports

- Intel® Matrix Storage supporting SATA RAID 0,1, 5,
and 10

JMicron® JMB361 controller:

- 1 x External SATA 3.0 Gb/s port at rear panel

- 1 x Ultra DMA 133/100/66 for up to 2 PATA devices

Realtek® 8112L Gigabit LAN controller featuring AI NET2

14 x USB 2.0 ports (6 ports at mid-board, 8 ports at rear
panel)

VIA® VT1828S 8-channel High Denition Audio CODEC

- Absolute Pitch BD 192/24

- DTS Surround Sensation UltraPC

- BD audio layer Content Protection

- Support Jack-Detection, Multi-Streaming, and Front
Panel Jack-Retasking

- Optical S/PDIF out port at back I/O

(continued on the next page)

ix

P7P55D LE specications summary

ASUS Unique Features

ASUS Exclusive
Overclocking Features

Back Panel I/O Ports 1 x PS/2 keyboard port (Purple)

ASUS 8+2 Phase Power Design
ASUS Xtreme Design
ASUS Exclusive Overclocking Features:

- ASUS TurboV

- ASUS Turbo Key
ASUS Exclusive Features:

- MemOK!

- ASUS EPU

- Express Gate
ASUS Quiet Thermal Solution:

- ASUS Fanless Design: Stylish Heatsink Solution

- ASUS Fanless Design: Stack Cool 3

- ASUS Fan Xpert
ASUS Crystal Sound:

- ASUS Noise Filter

ASUS EZ DIY:

- ASUS Q-DIMM

- ASUS Q-Shield

- ASUS Q-Connector

- ASUS O.C. Prole

- ASUS CrashFree BIOS 3

- ASUS EZ Flash 2

- ASUS My Logo 2

- Multi-language BIOS

Precision Tweaker:

- vCore: Adjustable CPU voltage at 0.00625V
increment

- vIMC: Adjustable IMC voltage at 0.05V increment

- vDRAM Bus: 8-step DRAM voltage control

- vPCH: 2-step chipset voltage control

- vCPU PLL: 4-step reference voltage control
SFS (Stepless Frequency Selection):

- Internal Base Clock tuning from 80 MHz up to 500
MHz at 1MHz increment

- PCI Express frequency tuning from 100MHz up to
200MHz at 1MHz increment

Overclocking Protection:

- ASUS C.P.R.(CPU Parameter Recall)

1 x PS/2 mouse port (Green)
1 x S/PDIF Out (Optical)
1 x RJ45 port
8 x USB 2.0/1.1
1 x eSATA port
8-channel Audio I/O

(continued on the next page)

x

P7P55D LE specications summary

Internal I/O Connectors 3 x USB connectors support additional 6 USB ports

BIOS Features 16 Mb Flash ROM, AMI BIOS, PnP, DMI2.0, WfM2.0, SM

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

Accessories 1 x UltraDMA 133/100 cable

Support DVD Contents Drivers

Form Factor ATX Form Factor, 12”x 8.6” (30.5cm x 21.8cm)

*Specications are subject to change without notice.

1 x IDE connector
6 x SATA connectors
1 x CPU Fan connector
2 x Chassis Fan connectors (1 x 4-pin, 1 x 3-pin)
1 x Power Fan connector
1 x Front panel audio connector
1 x S/PDIF Out header
1 x CD audio in
1 x 24-pin ATX Power connector
1 x 8-pin EATX 12V Power connector
1 x System Panel (Q-Connector)
1 x MemOK! button
1 x COM connector

BIOS 2.5, ACPI 2.0a, Multi-language BIOS, ASUS EZ Flash
2, ASUS CrashFree BIOS 3

2 x Serial ATA 3.0Gb/s cables
ASUS Q-Shield
User's manual
2 in 1 Q-connector

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

xi

xii

Chapter 1

Product introduction

Thank you for buying an ASUS® P7P55D LE motherboard!
Before you start installing the motherboard, and hardware devices on it, check the items in

your motherboard package. Refer to page ix for the list of accessories.

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

1.1 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.

Onboard LED

The motherboard comes with a standby power LED that lights up to indicate that the system
is ON, in sleep mode, or in soft-off mode. This is a reminder that you must shut down
the system and unplug the power cable before removing or plugging in any motherboard
component. The illustration below shows the location of the onboard LED.

ASUS P7P55D LE 1-1

1.2 Motherboard overview

1.2.1 Motherboard layout

Ensure that you install the motherboard into the chassis in the correct orientation. The edge
with external ports goes to the rear part of the chassis.

Place this side towards
the rear of the chassis.

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.

1.2.2 Layout contents

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

ATX power connectors (24-pin EATXPWR, 8-pin

1.
EATX12V)

2. LGA1156 CPU Socket 1-3 10. Clear RTC RAM (3-pin CLRTC) 1-17

3. DDR3 DIMM slots 1-8 11.

CPU, chassis, and power fan connectors (4-pin
CPU_FAN, 4-pin CHA_FAN1, 3-pin CHA_FAN2,

4.
3-pin PWR_FAN)

5. MemOK! switch 1-18 13. Optical drive audio connector (4-pin CD) 1-24

JMicron® JMB361 IDE Connector (40-1 pin

6.
PRI_IDE [Blue])

7. Onboard LED 1-1 15. Serial port connector (10-1 pin COM1) 1-23

Intel® P55 Serial ATA connectors (7-pin SATA

8.
1-6)

* Optional

1-2 Chapter 1: Product introduction

1-20 9. System panel connector (20-8 pin PANEL) 1-22

1-20 12.

1-25 14.

1-21

USB connectors (10-1 pin USB910,
USB1112, USB1314)

Digital audio connector (4-1 pin
SPDIF_OUT)

Front panel audio connector (10-1 pin
AAFP)

1-23

1-24

1-21

1.3 Central Processing Unit (CPU)

A

B

The motherboard comes with a surface mount LGA1156 socket designed for the Intel® Core™
i7 / Core™ i5 Processors.

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

LGA1156 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.

1.3.1 Installing the CPU

To install a CPU:

1. Locate the CPU socket on the motherboard.

2. Press the load lever with your thumb (A),
and then move it to the right (B) until it is

Load lever

released from the retention tab.

To prevent damage to the socket pins,
do not remove the PnP cap unless you
are installing a CPU.

Retention tab

ASUS P7P55D LE 1-3

3. Lift the load lever in the direction of the
arrow until the load plate is completely
lifted.

4. Remove the PnP cap from the CPU
socket.

Load plate

PnP cap

5. Position the CPU over the socket,
ensuring that the gold triangle is on the
bottom-left corner of the socket, and then

t the socket alignment keys into the CPU

CPU notches

notches.

The CPU ts in only one correct

orientation. DO NOT force the CPU
into the socket to prevent bending
the connectors on the socket and
damaging the CPU!

1-4 Chapter 1: Product introduction

Gold

triangle

mark

Alignment keys

B

A

C

6. Apply some Thermal Interface Material
to the exposed area of the CPU that the
heatsink will be in contact with, ensuring
that it is spread in an even thin layer.

Some heatsinks come with pre-applied
thermal paste. If so, skip this step.

The Thermal Interface Material is
toxic and inedible. DO NOT eat it. If
it gets into your eyes or touches your
skin, wash it off immediately, and seek
professional medical help.

7. Close the load plate (A), and then push
down the load lever (B), ensuring that
the front edge of the load plate slides
under the retention knob (C).

8. Insert the load lever under the retention
tab.

ASUS P7P55D LE 1-5

1.3.2 Installing the CPU heatsink and fan

The Intel® LGA1156 processor requires a specially designed heatsink and fan assembly to
ensure optimum thermal condition and performance.

• When you buy a boxed Intel® processor, the package includes the CPU fan and
heatsink assembly. If you buy a CPU separately, ensure that you use only
Intel®-certied multi-directional heatsink and fan.

• Your Intel® LGA1156 heatsink and fan assembly comes in a push-pin design and
requires no tool to install.

• Use an LGA1156-compatible CPU heatsink and fan assembly only. The LGA1156

socket is incompatible with the LGA775 and LGA1366 sockets in size and dimension.

If you purchased a separate CPU heatsink and fan assembly, ensure that the Thermal
Interface Material is properly applied to the CPU heatsink or CPU before you install the
heatsink and fan assembly.

Ensure that you have installed the motherboard to the chassis before you install the CPU
fan and heatsink assembly.

To install the CPU heatsink and fan:

1. Place the heatsink on top of the installed

A

CPU, making sure that the four fasteners
match the holes on the motherboard.

2. Push down two fasteners at a time in

B

B

a diagonal sequence to secure the
heatsink and fan assembly in place.

A

A

B

1

B

1-6 Chapter 1: Product introduction

A

Orient the heatsink and fan assembly such that the CPU fan cable is closest to the CPU fan
connector.

1

3. Connect the CPU fan cable to the connector on the motherboard labeled CPU_FAN.

DO NOT forget to connect the CPU fan connector! Hardware monitoring errors can occur if
you fail to plug this connector.

1.3.3 Uninstalling the CPU heatsink and fan

To uninstall the CPU heatsink and fan:

1. Disconnect the CPU fan cable from the
connector on the motherboard.

2. Rotate each fastener counterclockwise.

3. Pull up two fasteners at a time in a

B

A

B

diagonal sequence to disengage the
heatsink and fan assembly from the
motherboard.

A

B

B

A

A

4. Carefully remove the heatsink and fan assembly from the motherboard.

ASUS P7P55D LE 1-7

1.4 System memory

1.4.1 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:

Recommended memory congurations

One DIMM:

Install one memory module in slot A1 or B1 rst as a single-channel operation.

Two DIMMs (dual-channel operation):

Four DIMMs (dual-channel operation):

1-8 Chapter 1: Product introduction

1.4.2 Memory congurations

You may install 1GB, 2GB and 4GB unbuffered and 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 conguration. Any excess
memory from the higher-sized channel is then mapped for single-channel operation.

• Due to Intel spec denition, X.M.P. DIMMs are supported for one DIMM per channel

only.

• According to Intel CPU spec, DIMM voltage below 1.65V is recommended to protect
the CPU.

• According to Intel CPU spec, CPUs with a core frequency of 2.66G support the
maximum DIMM frequency of up to DDR3-1333. To use DIMMs of a higher frequency

with a 2.66G CPU, enable the DRAM O.C. Prole feature in BIOS. Refer to section 2.4

Ai Overclock Tuner for details.

• 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.
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).

• 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
adjustment.

• For system stability, use a more efcient memory cooling system to support a full

memory load (4 DIMMs) or overclocking condition.

ASUS P7P55D LE 1-9

Ai Tweaker menu

for manual memory frequency

P7P55D LE Motherboard Qualified Vendors Lists (QVL) DDR3-1067MHz
capability for CPU at 2.66, 2.8 and 2.93GHz

Voltage

DIMM socket
support (Optional)

A* B* C*

•

•

•

1024MB SS

SS/DSChip

Brand

ELPIDA

Chip NO.

J1108BABG-DJ-E 7(1066-7-7-7-20)

Vendor Part No. Size

CORSAIR CM3X1024-1066C7 1024MB DS N/A Heat-Sink Package 7 1.1 • • •

Crucial CT12864BA1067.8FF 1024MB SS MICRON D9KPT 7(1066-7-7-7-20) • • •

Crucial CT12864BA1067.8SFD 1024MB SS MICRON D9JNL 7 • • •

Crucial CT12872BA1067.9FF 1024MB SS MICRON D9KPT(ECC) 7(1066-9-9-9-25) • • •

Crucial CT25664BA1067.16FF 2048MB DS MICRON D9KPT 7(1066-7-7-7-20) • • •

Crucial CT25664BA1067.16SFD 2048MB DS MICRON D9JNL 7 • • •

Crucial CT25672BA1067.18FF 2048MB DS MICRON D9KPT(ECC) 7(1066-7-7-7-20) • • •

ELPIDA EBJ10UE8BAW0-AE-E

ELPIDA

EBJ11RD8BAFA-AE-E 1024MB DS ELPIDA J5308BASE-AC-E(ECC) 7 • • •

ELPIDA EBJ11UD8BAFA-AG-E 1024MB DS ELPIDA J5308BASE-AC-E 8 • • •

ELPIDA EBJ21UE8BAW0-AE-E 2048MB DS ELPIDA J1108BABG-DJ-E 7(1066-7-7-7-20) • • •

Hynix HMT112U6AFP8C-G7N0 1024MB SS HYNIX H5TQ1G83AFPG7C 7 • • •

Hynix HYMT112U64ZNF8-G7 1024MB SS HYNIX HY5TQ1G831ZNFP-G7 7 • •

Hynix HMT125U6AFP8C-G7N0 2048MB DS HYNIX H5TQ1G83AFPG7C 7 • • •

Hynix HYMT125U64ZNF8-G7 2048MB DS HYNIX HY5TQ1G831ZNFP-G7 7 • •

KINGSTON KVR1066D3N7/1G 1024MB SS ELPIDA J1108BABG-DJ-E 1066-7-7-7-20 1.5 • • •

KINGSTON KVR1066D3N7/2G 2048MB DS ELPIDA J1108BABG-DJ-E 1066-7-7-7-20 1.5 • • •

KINGSTON KVR1066D3N7/4G 4096MB DS SAMSUNG K4B2G0846B-HCF8 1066-7-7-7-20 1.5 • • •

MICRON MT8JTF12864AY-1G1D1 1024MB SS MICRON 7VD22 7 • • •

MICRON MT8JTF12864AZ-1G1F1 1024MB SS MICRON 8ZF22 D9KPV 7(1066-7-7-7-20) • • •

MICRON MT8JTF12864AZ-1G1F1 1024MB SS MICRON D9KPT 7(1066-7-7-7-20) • • •

MICRON MT9JSF12872AZ-1G1F1 1024MB SS MICRON D9KPT(ECC) 7(1066-9-9-9-25) • •

MICRON MT16JTF25664AY-1G1D1 2048MB DS MICRON 7VD22 7 • • •

MICRON MT16JTF25664AZ-1G1F1 2048MB DS MICRON 8ZF22 D9KPV 7(1066-7-7-7-20) • • •

MICRON MT16JTF25664AZ-1G1F1 2048MB DS MICRON D9KPT 7(1066-7-7-7-20) • • •

MICRON MT18JSF25672AZ-1G1F1 2048MB DS MICRON D9KPT(ECC) 7(1066-7-7-7-20) • •

SAMSUNG M378B5273BH1-CF8 4096MB DS SAMSUNG K4B2G0846B-HCF8 8(7-7-7-20) 1.5 • • •

Transcend TS256MLK64V1U 2048MB DS ELPIDA J1108BABG-AE-E 7(1066-7-7-7-20) • • •

Asint SLY3128M8-EAE 1024MB SS Asint DDRIII1208-AE (7-7-7-20) • • •

Asint SLZ3128M8-EAE 2048MB DS Asint DDRIII1208-AE (7-7-7-20) • • •

WINTEC 3DU3191A-10 1024MB DS Qimonda IDSH51-03A1F1C-10F 7 • • •

Timing
Lable(Bios)

P7P55D LE Motherboard Qualified Vendors Lists (QVL) DDR3-1333MHz
capability for CPU at 2.66, 2.8 and 2.93GHz

DIMM socket

Vendor Part No. Size

A-DATA AD133301GOU 1024MB SS A-DATA AD30908C8D-15IG 1333-9-9-9-24 • • •

A-DATA AD1333002GOU 2048MB DS A-DATA AD30908C8D-15IG 1333-9-9-9-24 • • •

A-DATA AD31333E002G0U 6144MB(Kit of 3)DS N/A Heat-Sink Package 7-7-7-20(1333-9-9-9-24) 1.65-1.85 • • •

Apacer 78.01GC6.420 1024MB SS ELPIDA J1108BABG-DJ-E (1333-9-9-9-24) • • •

Apacer 78.01GC6.9L0 1024MB SS Apacer AM5D5808AEWSBG 9(1333-9-9-9-24) • • •

Apacer 78.01GC8.422 1024MB SS ELPIDA J1108BABG-DJ-

Apacer 78.A1GC6.421 2048MB DS ELPIDA J1108BABG-DJ-E (1333-9-9-9-24) • • •

Apacer 78.A1GC6.9L1 2048MB DS Apacer AM5D5808AEWSBG 9(1333-9-9-9-24) • • •

Apacer 78.A1GC8.423 2048MB DS ELPIDA J1108BABG-DJ-

CORSAIR TR3X3G1333C9 (Ver2.1) 3072MB(Kit of 3)SS N/A Heat-Sink Package 9-9-9-24(1333-9-9-9-24) 1.5 • • •

CORSAIR CM3X1024-1333C9DHX 1024MB DS N/A Heat-Sink Package (1333-9-9-9-24) 1.1 • •

BoxP/N:TWIN3X2048­1333C9

CORSAIR

(CM3X1024­1333C9)Ver1.1

BoxP/N:
TW3X4G1333C9DHX

CORSAIR

(CM3X2048­1333C9DHX)Ver3.2

CORSAIR TR3X6G1333C9 (Ver2.1) 6144MB(Kit of 3)DS N/A Heat-Sink Package 9-9-9-24(1333-9-9-9-24) 1.5 • • •

Crucial CT12864BA1339.8FF 1024MB SS MICRON D9KPT 9(1333-9-9-9-24) • • •

Crucial CT12864BA1339.8SFD 1024MB SS MICRON MT8JF12864AY-

Crucial CT12872BA1339.9FF 1024MB SS MICRON D9KPT(ECC) 9(1333-9-9-9-24) • • •

Crucial CT25664BA1339.16FF 2048MB DS MICRON D9KPT 9(1333-9-9-9-24) • • •

2048MB(Kit of

2)

4096MB(Kit of

2)

SS/DSChip

DS N/A Heat-Sink Package 9-9-9-24(1066-7-7-7-20) 1.70 • • •

DS N/A Heat-Sink Package 9-9-9-24(1066-7-7-7-20) 1.70 • •

Brand

Chip NO.

E(ECC)

E(ECC)

1G4D1

Timing
Dimm(Bios)

(1333-9-9-9-24) • •

(1333-9-9-9-24) • • •

(1333-9-9-9-24) • • •

1-10 Chapter 1: Product introduction

Voltage

support
(Optional)

A* B* C*

P7P55D LE Motherboard Qualified Vendors Lists (QVL) DDR3-1333MHz
capability for CPU at 2.66, 2.8 and 2.93GHz (continued)

DIMM socket

Vendor Part No. Size

Crucial CT25672BA1339.18FF 2048MB DS MICRON D9KPT(ECC) 9(1333-9-9-9-24) • • •
Crucial BL25664BA1336.16SFB1 4096MB(Kit of 2) DS NA Heat-Sink Package 6-6-6-20(1333-9-9-9-24) 1.8 • • •
ELPIDA EBJ10UE8BAW0-DJ-E 1024MB SS ELPIDA J1108BABG-DJ-E 9(1333-9-9-9-24) • • •
ELPIDA

EBJ21UE8BAW0-DJ-E
G.SKILL F3-10600CL7D-2GBPI 2048MB(Kit of 2) SS N/A Heat-Sink Package (1337-7-7-7-18) 1.65 • •
G.SKILL F3-10600CL8D-2GBHK 2048MB(Kit of 2) SS N/A Heat-Sink Package (1337-8-8-8-22) 1.65 • • •
G.SKILL F3-10666CL7T-6GBPK(XMP) 2048MB DS N/A Heat-Sink Package 7-7-7-18(1333-7-7-7-18) 1.5-1.6 • • •
G.SKILL F3-10666CL8D-4GBHK(XMP) 4096MB(Kit of 2) DS N/A Heat-Sink Package 8-8-8-21(1333-7-7-7-20) 1.5-1.6 • • •
G.SKILL

F3-10666CL9T-6GBNQ 6144MB(Kit of 3) DS N/A Heat-Sink Package 9-9-9-24(1333-9-9-9-24) 1.5 • • •
GEIL GV34GB1333C7DC 4096MB(Kit of 2) DS N/A Heat-Sink Package 7-7-7-24(1333-8-8-8-28) 1.5 • • •
Hynix HMT112U6BFR8C-H9 1024MB SS Hynix H5TQ1G83BFR 9(1333-9-9-9-24) • • •
Hynix HMT125U6BFR8C-H9 2048MB DS Hynix H5TQ1G83BFR 9(1333-9-9-9-24) • • •
Hynix HMT125U6BFR8C-H9 2048MB DS Hynix H5TQ1G83BFRH9C 9(1333-9-9-9-24) • • •

KINGMAX FLFD45F-B8EE9 1024MB SS ELPIDA J1108BASE-DJ-E (1333-9-9-9-24) • • •
KINGSTON KVR1333D3N9/1G
KINGSTON KVR1333D3N9/2G 2048MB DS ELPIDA J1108BABG-DJ-E 1333-9-9-9-24 1.5 • • •
KINGSTON KVR1333D3N9/2G 2048MB DS ELPIDA J1108BABG-DJ-E 9(1066-8-7-7-20) 1.5 • • •
MICRON MT8JTF12864AY-1G4BYES 1024MB SS MICRON Z9HWR (1333-9-9-9-24) • •
MICRON MT8JTF12864AZ-1G4F1 1024MB SS MICRON 9FF22 D9KPT 9(1066-8-8-8-20) • • •
MICRON

MT8JTF12864AZ-1G4F1 1024MB SS MICRON D9KPT 9(1333-9-9-9-24) • • •
MICRON MT9JSF12872AZ-1G4F1 1024MB SS MICRON D9KPT(ECC) 9(1333-9-9-9-24) • • •
MICRON MT16JF25664AZ-1G4F1 2048MB DS MICRON D9KPT 9(1333-9-9-9-24) • • •
MICRON MT16JTF25664AZ-1G4F1 2048MB DS MICRON 9FF22 D9KPT 9(1066-8-8-8-20) • • •
MICRON MT18JSF25672AZ-1G4F1 2048MB DS MICRON D9KPT(ECC) 9(1333-9-9-9-24) • • •
OCZ OCZ3RPX1333EB2GK 1024MB SS N/A Heat-Sink Package (1066-6-5-5-20) • •
OCZ OCZ3G1333LV3GK 3072MB(Kit of 3) SS N/A Heat-Sink Package 9-9-9(1066-7-7-7-20) 1.65 • •
OCZ OCZ3P1333LV3GK 3072MB(Kit of 3) SS N/A Heat-Sink Package 7-7-7(1066-7-7-7-16) 1.65 • • •
OCZ OCZ3P13332GK 1024MB DS N/A Heat-Sink Package 7-7-7-20(1333-9-9-9-24) • •
OCZ OCZ3P13334GK 4096MB(Kit of 2) DS N/A Heat-Sink Package 7(1333-7-7-7-20) 1.8 • • •
OCZ OCZ3G1333LV6GK 6144MB(Kit of 3) DS N/A Heat-Sink Package 9-9-9(1066-7-7-7-20) 1.65 • • •
OCZ OCZ3P1333LV6GK 6144MB(Kit of 3) DS N/A Heat-Sink Package 7-7-7(1066-7-7-7-20) 1.65 • • •
OCZ OCZX1333LV6GK(XMP) 6144MB(Kit of 3) DS NA Heat-Sink Package 8-8-8(1066-7-7-7-16) 1.6 • • •
SAMSUNG M378B2873DZ1-CH9 1024MB SS SAMSUNG K4B1G0846D 9(1333-9-9-9-24) • • •
SAMSUNG M378B2873EH1-CH9 1024MB SS SAMSUNG K4B1G0846E 1066-8-7-7-20 • • •
SAMSUNG M391B2873DZ1-CH9 1024MB SS SAMSUNG K4B1G0846D(ECC) 9(1333-9-9-9-24) • • •
SAMSUNG M378B5673DZ1-CH9 2048MB DS SAMSUNG K4B1G0846D 9(1333-9-9-9-24) • • •
SAMSUNG M378B5673EH1-CH9 2048MB DS SAMSUNG K4B1G0846E 1066-8-7-7-20 • • •
SAMSUNG M391B5673DZ1-CH9 2048MB DS SAMSUNG K4B1G0846D(ECC) 9(1333-9-9-9-24) • • •
SAMSUNG M378B5273BH1-CH9 4096MB DS SAMSUNG K4B2G0846B-HCH9 9(1333-9-9-9-24) • • •
Super

W1333UX2GB(XMP) 2048MB(Kit of 2) SS N/A Heat-Sink Package 8(1333-8-8-8-24) 1.8 • • •
Talent

Transcend TS128MLK64V3U 1024MB SS SAMSUNG K4B1G0846D 9(1333-9-9-9-24) • • •
Transcend TS256MLK64V3U 2048MB DS SAMSUNG K4B1G0846D 9(1333-9-9-9-24) • • •
Asint SLY3128M8-EDJ 1024MB SS Asint DDRIII1208-DJ (9-9-9-24) • • •
Asint SLY3128M8-EDJE 1024MB SS ELPIDA J1108BASE-DJ-E 1066-8-8-8-20 • • •
Asint SLZ3128M8-EDJ 2048MB DS Asint DDRIII1208-DJ (9-9-9-24) • • •
Asint SLZ3128M8-EDJE 2048MB DS ELPIDA J1108BASE-DJ-E 1066-8-8-8-20 • • •
ASUS N/A 1024MB DS N/A Heat-Sink Package (1333-9-9-9-24) • • •
BUFFALO FSX1333D3G-1G 1024MB SS N/A Heat-Sink Package (1066-7-7-7-20) • •
BUFFALO FSH1333D3G-T3G(XMP) 3072MB(Kit of 3) SS N/A Heat-Sink Package 7-7-7-20(1066-8-7-7-20) • • •
BUFFALO FSX1333D3G-2G 2048MB DS N/A Heat-Sink Package (1066-7-7-7-20) • •
Patriot PDC32G1333LLK 1024MB SS PATRIOT Heat-Sink Package 7(1337-7-7-7-20) 1.7 • •
Patriot PVT33G1333ELK 3072MB(Kit of 3) SS N/A Heat-Sink Package 9-9-9-24(1066-7-7-7-20) 1.65 • • •
Patriot PVS34G1333ELK 4096MB(Kit of 2) DS N/A Heat-Sink Package 9-9-9-24(1066-7-7-7-20) 1.5 • • •
Patriot PVS34G1333LLK 4096MB(Kit of 2) DS N/A Heat-Sink Package 7-7-7-20(1066-7-7-7-20) 1.7 • •
Patriot PVT36G1333ELK 6144MB(Kit of 3) DS N/A Heat-Sink Package 9-9-9-24(1066-7-7-7-20) 1.65 • • •
Silicon

SP001GBLTU133S02 1024MB SS S-POWER I0YT3E0 9(1333-9-9-9-24) • • •
Power

Silicon

SP002GBLTU133S02 2048MB DS S-POWER I0YT3E0 9(1333-9-9-9-24) • • •
Power

2048MB DS

1024MB

SS/

Chip Brand Chip NO.

DS

ELPIDA J1108BABG-DJ-E

SS ELPIDA

J1108BABG-DJ-E 9(1066-8-7-7-20)

Timing
Dimm(Bios)

9(1333-9-9-9-24)

Voltage

1.5

support
(Optional)

A* B* C*

•

•

• •

•

•

ASUS P7P55D LE 1-11

P7P55D LE Motherboard Qualified Vendors Lists (QVL) DDR3-1600MHz
capability for CPU at 2.66GHz

DIMM socket

Vendor Part No. Size

A-DATA AD31600E001GMU 3072MB(Kit of 3) SS N/A Heat-Sink Package 8-8-8-24(1333-9-9-9-24) 1.65-1.85 • • •
A-DATA AD31600F002GMU(XMP) 6144MB(Kit of 3) DS N/A Heat-Sink Package 7-7-7-20(1333-9-9-9-24) 1.75-1.85 • • •
CORSAIR TR3X3G1600C8D(XMP)Ver2.1 3072MB(Kit of 3) SS N/A Heat-Sink Package 8-8-8-24(1601-8-8-8-24) 1.65 • •
CORSAIR TR3X3G1600C8D
CORSAIR TR3X3G1600C9(XMP)Ver1.1 3072MB(Kit of 3) SS N/A Heat-Sink Package 9-9-9-24(1601-9-9-9-24) 1.65 • •

BoxP/N:
TW3X4G1600C9DHXNV

CORSAIR

(CM3X2G1600C9DHXNV)Ver4

.1
CORSAIR TR3X6G1600C8D(XMP)Ver2.1 6144MB(Kit of 3) DS N/A Heat-Sink Package 8-8-8-24(1601-8-8-8-24) 1.65 • • •
CORSAIR TR3X6G1600C8D 6144MB(Kit of 3) DS N/A Heat-Sink Package 8-8-8-24(1600-8-8-8-24) 1.65 • • •
CORSAIR

TR3X6G1600C9(XMP)Ver2.1 6144MB(Kit of 3) DS N/A Heat-Sink Package 9-9-9-24(1333-9-9-9-24) 1.65 • • •
Crucial BL12864BA1608.8SFB(XMP) 1024MB SS N/A Heat-Sink Package (1601-8-8-8-24) 1.8 • • •
G.SKILL F3-12800CL9D-2GBNQ 2048MB(Kit of 2) SS N/A Heat-Sink Package (1333-9-9-9-24) 1.6 • • •
G.SKILL F3-12800CL8T-6GBHK(XMP) 6144MB(Kit of 3) DS N/A Heat-Sink Package 8-8-8-21(1333-8-8-8-21) 1.6-1.65 • • •
G.SKILL F3-12800CL8T-6GBPI(XMP) 6144MB(Kit of 3) DS N/A Heat-Sink Package 8-8-8-21(1066-8-8-8-20) 1.6~1.65 • • •
G.SKILL F3-12800CL9T-6GBNQ 6144MB(Kit of 3) DS N/A Heat-Sink Package 9-9-9-24(1601-9-9-9-24) 1.5-1.6 • • •
GEIL GV34GB1600C8DC 4096MB(Kit of 2) DS N/A Heat-Sink Package 8-8-8-28(1600-8-8-8-28) 1.6 • • •
KINGMAX FLGD45F-B8KG9-NAES 1024MB SS KINGMAX KFB8FNGXF-ANX-

KINGMAX FLGE85F-B8KG9-NEES 2048MB DS KINGMAX KFB8FNGXF-ANX-

KINGSTON KHX12800D3LLK3/3GX(XMP) 3072MB(Kit of 3) SS N/A Heat-Sink Package 1600-8-8-8-20 1.65 • • •
KINGSTON KHX12800D3K2/4G 4096MB(Kit of 2) DS N/A Heat-Sink Package 9(1333-9-9-9-24) 1.9 • • •
KINGSTON KHX12800D3LLK3/6GX(XMP) 6144MB(Kit of 3) DS N/A Heat-Sink Package (1066-8-8-8-20) 1.65 • • •
OCZ OCZ3P1600EB1G 1024MB SS N/A Heat-Sink Package 7-6-6-24(1333-7-7-7-20) • •
OCZ OCZ3G1600LV3GK 3072MB(Kit of 3) SS N/A Heat-Sink Package 8-8-8(1066-7-7-7-20) 1.65 • • •
OCZ OCZ3P1600LV3GK 3072MB(Kit of 3) SS N/A Heat-Sink Package 7-7-7(1066-7-7-7-20) 1.65 • • •
OCZ OCZ3P16004GK 4096MB(Kit of 2) DS N/A Heat-Sink Package 7-7-7(1333-7-7-7-20) 1.9 • •
OCZ OCZ3P1600EB4GK 4096MB(Kit of 2) DS N/A Heat-Sink Package 7-7-6(1333-7-7-7-20) 1.8 • • •
OCZ OCZ3G1600LV6GK 6144MB(Kit of 3) DS N/A Heat-Sink Package 8-8-8(1066-7-7-7-16) 1.65 • •
OCZ OCZ3X1600LV6GK(XMP) 6144MB(Kit of 3) DS N/A Heat-Sink Package 8-8-8(1066-7-7-7-16) 1.65 • • •
Cell Shock CS322271 2048MB(Kit of 2) DS N/A Heat-Sink Package 7-7-7-14(1066-7-7-7-20) 1.7-1.9 • • •
Mushkin 996657 4096MB(Kit of 2) DS N/A Heat-Sink Package 7-7-7-20 • • •
Mushkin 998659(XMP) 6144MB(Kit of 3) DS N/A Heat-Sink Package 9-9-9-24(1333-9-9-9-24) 1.5-1.6 • • •
Patriot PVT33G1600ELK 3072MB(Kit of 3) SS N/A Heat-Sink Package 9-9-9-24(1066-7-7-7-20) 1.65 • • •
Patriot PVS34G1600ELK 4096MB(Kit of 2) DS N/A Heat-Sink Package 9-9-9-24(1066-7-7-7-20) 1.8 • •
Patriot PVS34G1600LLK(XMP) 4096MB(Kit of 2) DS N/A Heat-Sink Package 7-7-7-20(1066-7-7-7-20) 1.9 • • •
Patriot PVS34G1600LLKN 4096MB(Kit of 2) DS N/A Heat-Sink Package 7-7-7-20(1066-7-7-7-20) 2.0 • •
Patriot PVT36G1600ELK 6144MB(Kit of 3) DS N/A Heat-Sink Package 9-9-9-24(1066-7-7-7-20) 1.65 • • •
Patriot PVT36G1600ELK 6144MB(Kit of 3) DS N/A Heat-Sink Package 9-9-9-24(1600-7-7-7-20) 1.65 • • •
PQI MFADR401PA0102(XMP) 2048MB DS SAMSUNG K4B1G08460 1066-8-8-8-20 • • •

3072MB(Kit of 3)

4096MB(Kit of 2) DS N/A Heat-Sink Package (1333-9-9--9-24) 1.80 • • •

SS/DSChip

Brand

SS N/A

Chip NO.

Heat-Sink Package 8-8-8-24(1600-8-8-8-24)

12A

12A

Timing
Dimm(Bios)

9(1600-9-8-9-28) 1.5 • • •

9(1600-9-8-9-28) 1.5 • • •

Voltage

1.65

support
(Optional)

A* B* C*

• •

P7P55D LE Motherboard Qualified Vendors Lists (QVL) DDR3-1625MHz
capability for CPU at 2.66GHz

Vendor Part No. Size SS/DS

KINGSTON KHX13000D3LLK2/2GN(EPP) 2048MB(Kit of 2) SS N/A Heat-Sink Package 1.9 • • •
KINGSTON KHX13000D3LLK2/2GX(XMP) 2048MB(Kit of 2) SS N/A Heat-Sink Package 1.9 • • •
KINGSTON KHX13000D3LLK2/2GXN 2048MB(Kit of 2) SS N/A Heat-Sink Package 1.9 • •

Chip
Brand

Chip NO.

Timing
Dimm(Bios)

1-12 Chapter 1: Product introduction

Voltage

DIMM socket support
(Optional)

A* B* C*

P7P55D LE Motherboard Qualified Vendors Lists (QVL) DDR3-1625MHz
capability for CPU at 2.8 and 2.93GHz

DIMM socket

Vendor Part No. Size SS/DS

KINGSTON KHX13000D3LLK2/2GN(EPP) 2048MB(Kit of 2) SS N/A Heat-Sink Package 1.9 • • •
KINGSTON KHX13000D3LLK2/2GX(XMP) 2048MB(Kit of 2) SS N/A Heat-Sink Package 1.9 • • •
KINGSTON KHX13000D3LLK2/2GXN 2048MB(Kit of 2) SS N/A Heat-Sink Package 1.9 • • •

Chip
Brand

Chip NO.

Timing
Lable(Bios)

Voltage

support
(Optional)

A* B* C*

P7P55D LE Motherboard Qualified Vendors Lists (QVL) DDR3-1800MHz
capability for CPU at 2.66GHz

DIMM socket

Vendor Part No. Size

Apacer 78.0AGCD-CDZ(XMP) 2GB(Kit of 2) SS N/A Heat-Sink Package 8-8-8-24(1800-8-8-8-24) 1.8 • •

BoxP/N:TW3X4G1800C8DF

CORSAIR

(CM3X2G1800C8D)Ver4.1
KINGSTON KHX14400D3/1G 1GB SS N/A Heat-Sink Package 1.9 • •
KINGSTON KHX14400D3K2/2GN(EPP) 2GB(Kit of 2) SS N/A Heat-Sink Package 1.9 • • •
KINGSTON KHX14400D3K3/3GX(XMP) 3GB(Kit of 3) SS N/A Heat-Sink Package 1800-9-9-9-27 1.65 • •
OCZ OCZ3P18002GK 2GB(Kit of 2) SS N/A Heat-Sink Package 8 •
OCZ OCZ3P18004GK 4GB(Kit of 2) DS N/A Heat-Sink Package 8 1.9 • •
Transcend TX1800KLU-2GK(XMP) 2GB(Kit of 2) SS N/A Heat-Sink Package 8 • • •
Patriot PVS32G1800LLKN(EPP) 2GB(Kit of 2) SS N/A Heat-Sink Package 8-8-8-20(1066-7-7-7-20) 1.9 • •

SS/DSChip

4GB(Kit of 2) DS N/A Heat-Sink Package 8-8-8-24 1.80 • •

Brand

Chip NO.

Timing
Dimm(Bios)

Voltage

support
(Optional)

A* B* C*

P7P55D LE Motherboard Qualified Vendors Lists (QVL) DDR3-1800MHz
capability for CPU at 2.8 and 2.93GHz

DIMM socket

Vendor Part No. Size

Apacer 78.0AGCD-CDZ(XMP) 2048MB(Kit of 2) SS N/A Heat-Sink Package 8-8-8-24(1800-8-8-8-24) 1.8 • •

BoxP/N:TW3X4G1800C8DF
CORSAIR

(CM3X2G1800C8D)Ver4.1
KINGSTON KHX14400D3/1G 1024MB SS N/A Heat-Sink Package 1.9 • •
KINGSTON KHX14400D3K2/2GN(EPP) 2048MB(Kit of 2) SS N/A Heat-Sink Package 1.9 • •

KHX14400D3K3/3GX(XMP)

KINGSTON

OCZ OCZ3P18002GK 2048MB(Kit of 2) SS N/A Heat-Sink Package 8 • •
OCZ OCZ3P18004GK 4096MB(Kit of 2) DS N/A Heat-Sink Package 8 1.9 • •
Transcend TX1800KLU-2GK(XMP) 2048MB(Kit of 2) SS N/A Heat-Sink Package 8 • •
Patriot PVS32G1800LLKN(EPP) 2048MB(Kit of 2) SS N/A Heat-Sink Package 8-8-8-20(1066-7-7-7-20) 1.9 • •

4096MB(Kit of 2) DS N/A Heat-Sink Package 8-8-8-24 1.80 • •

3072MB(Kit of 3) SS N/A Heat-Sink Package 1800-9-9-9-27 1.65 • •

SS/DSChip

Brand

Chip NO.

Timing
Dimm(Bios)

Voltage

support
(Optional)

A* B* C*

ASUS P7P55D LE 1-13

P7P55D LE Motherboard Qualified Vendors Lists (QVL) DDR3-1866MHz
capability for CPU at 2.66GHz

DIMM socket

Vendor Part No. Size

Apacer 78.0AGCQ.CBZ(XMP) 3GB(Kit of 3) SS N/A Heat-Sink Package 9-9-9-27(1066-8-8-8-20) •
Crucial BL12864BE2009.8SFB3(EPP) 1GB SS N/A Heat-Sink Package 9-9-9-28(1333-9-9-9-24) 2 • • •
G.SKILL

F3-16000CL7T-6GBPS(XMP) 6GB(Kit of 3)
G.SKILL F3-16000CL9T-6GBPS(XMP) 6GB(Kit of 3) DS N/A Heat-Sink Package 9-9-9-24(1066-8-8-8-20) 1.65 • •
KINGSTON KHX16000D3K2/2GN(EPP) 2GB(Kit of 2) SS N/A Heat-Sink Package 2.0 • •
KINGSTON KHX16000D3K3/3GX(XMP) 3GB(Kit of 3) SS N/A Heat-Sink Package 9(1333-9-9-9-24) 1.65 • • •
KINGSTON

KHX16000D3ULT1K3/6GX(XMP) 6GB(Kit 0f 3)
KINGSTON KHX16000D3T1K3/6GX(XMP) 6GB(Kit of 3) DS N/A Heat-Sink Package 9(1066-8-8-8-20) 1.65 • • •
OCZ OCZ3FXT20002GK 2GB(Kit of 2) SS N/A Heat-Sink Package 8 1.9 • •
OCZ OCZ3P20002GK(EPP) 2GB(Kit of 2) SS N/A Heat-Sink Package 9 1.9 • •
OCZ OCZ3P2000EB2GK 2GB(Kit of 2) SS N/A Heat-Sink Package 9-8-8(1066-8-7-7-20) 1.8 • •
Gingle 9CAASS37AZZ01D1 2BG DS N/A Heat-Sink Package 9-9-9-24 • • •

SS/DSChip

Chip NO.

Brand

DS

N/A Heat-Sink Package

DS

N/A Heat-Sink Package

Timing
Dimm(Bios)

7-8-7-20(1066-8-8-8-20)

8(1066-8-8-8-20)

Voltage

1.65 •

1.65 •

support
(Optional)

A* B* C*

•

• •

P7P55D LE Motherboard Qualified Vendors Lists (QVL) DDR3-1866MHz
capability for CPU at 2.8 and 2.93GHz

DIMM socket

Vendor Part No. Size

CORSAIR TR3X3G1866C9D(XMP) 3GB(Kit of 3) SS N/A Heat-Sink Package 9-9-9-24(1866-9-9-9-24) 1.65 • •
CORSAIR TR3X6G1866C9D 6GB(Kit of 3) DS N/A Heat-Sink Package 9-9-9-24(1866-9-9-9-24) 1.65 • • •
KINGSTON KHX14900D3K3/3GX(XMP) 3GB SS N/A Heat-Sink Package 9(1333-9-9-9-24) 1.65 • •
OCZ OCZ3RPR1866C9LV3GK 3GB(Kit of 3) SS N/A Heat-Sink Package 9-9-9(1066-7-7-7-20) 1.65 • •
OCZ OCZ3RPR1866C9LV6GK 6GB(Kit of 3) DS N/A Heat-Sink Package 9-9-9(1066-7-7-7-20) 1.65 • •
Super Talent W1866UX2GB(XMP) 2GB(Kit of 2) SS N/A Heat-Sink Package 8-8-8-24(1333-9-9-9-24) • • •
Patriot PVS32G1866LLK(XMP) 2GB(Kit of 2) SS N/A Heat-Sink Package 8-8-8-24(1066-7-7-7-20) 1.9 •
Patriot PVS32G1866LLK(XMP) 2GB(Kit of 2) SS N/A Heat-Sink Package 8-8-8-24(1866-8-8-8-24) 1.9 • •

SS/DSChip

Brand

Chip NO.

Timing
Dimm(Bios)

Voltage

support
(Optional)

A* B* C*

P7P55D LE Motherboard Qualified Vendors Lists (QVL) DDR3-2000MHz
capability for CPU at 2.66GHz

Vendor Part No. Size

Apacer 78.0AGCQ.CBZ(XMP) 3GB(Kit of 3) SS N/A Heat-Sink Package 9-9-9-27(1066-8-8-8-20) •
Crucial BL12864BE2009.8SFB3(EPP) 1GB SS N/A Heat-Sink Package 9-9-9-28(1333-9-9-9-24) 2 • • •
G.SKILL F3-16000CL7T-6GBPS(XMP) 6GB(Kit of 3) DS N/A Heat-Sink Package 7-8-7-20(1066-8-8-8-20) 1.65 • •
G.SKILL F3-16000CL9T-6GBPS(XMP) 6GB(Kit of 3) DS N/A Heat-Sink Package 9-9-9-24(1066-8-8-8-20) 1.65 • •
KINGSTON KHX16000D3K2/2GN(EPP) 2GB(Kit of 2) SS N/A Heat-Sink Package 2.0 • •
KINGSTON KHX16000D3K3/3GX(XMP) 3GB(Kit of 3) SS N/A Heat-Sink Package 9(1333-9-9-9-24) 1.65 • • •
KINGSTON KHX16000D3ULT1K3/6GX(XMP) 6GB(Kit 0f 3) DS N/A Heat-Sink Package 8(1066-8-8-8-20) 1.65 • • •
KINGSTON KHX16000D3T1K3/6GX(XMP) 6GB(Kit of 3) DS N/A Heat-Sink Package 9(1066-8-8-8-20) 1.65 • • •
OCZ OCZ3FXT20002GK 2GB(Kit of 2) SS N/A Heat-Sink Package 8 1.9 • •
OCZ OCZ3P20002GK(EPP) 2GB(Kit of 2) SS N/A Heat-Sink Package 9 1.9 • •
OCZ OCZ3P2000EB2GK 2GB(Kit of 2) SS N/A Heat-Sink Package 9-8-8(1066-8-7-7-20) 1.8 • •
Gingle 9CAASS37AZZ01D1 2GB DS N/A Heat-Sink Package 9-9-9-24 • • •

SS/DSChip

Brand

Chip NO.

Timing
Dimm(Bios)

1-14 Chapter 1: Product introduction

Voltage

DIMM socket
support (Optional)

A* B* C*

P7P55D LE Motherboard Qualified Vendors Lists (QVL) DDR3-2000MHz
capability for CPU at 2.8 and 2.93GHz

DIMM socket

Vendor Part No. Size

Apacer 78.0AGCQ.CBZ(XMP) 3GB(Kit of 3) SS N/A Heat-Sink Package 9-9-9-27(1066-8-8-8-20) • •
Crucial BL12864BE2009.8SFB3(EPP) 1GB SS N/A Heat-Sink Package 9-9-9-28(1333-9-9-9-24) 2 • • •
G.SKILL

F3-16000CL7T-6GBPS(XMP)
G.SKILL F3-16000CL9T-6GBPS(XMP) 6GB(Kit of 3) DS N/A Heat-Sink Package 9-9-9-24(1066-8-8-8-20) 1.65 • •
KINGSTON KHX16000D3K2/2GN(EPP) 2GB(Kit of 2) SS N/A Heat-Sink Package 2.0 • • •
KINGSTON KHX16000D3K3/3GX(XMP) 3GB(Kit of 3) SS N/A Heat-Sink Package 9(1333-9-9-9-24) 1.65 • • •
KINGSTON KHX16000D3ULT1K3/6GX(XMP)
KINGSTON KHX16000D3T1K3/6GX(XMP) 6GB(Kit of 3) DS N/A Heat-Sink Package 9(1066-8-8-8-20) 1.65 • • •
OCZ OCZ3FXT20002GK 2GB(Kit of 2) SS N/A Heat-Sink Package 8 1.9 • •
OCZ OCZ3P20002GK(EPP) 2GB(Kit of 2) SS N/A Heat-Sink Package 9 1.9 • •
OCZ OCZ3P2000EB2GK 2GB(Kit of 2) SS N/A Heat-Sink Package 9-8-8(1066-8-7-7-20) 1.8 • • •
Gingle 9CAASS37AZZ01D1 2GB DS N/A Heat-Sink Package 9-9-9-24 • • •
Patriot PVS32G2000LLKN 2GB(Kit of 2) SS N/A Heat-Sink Package 9-9-9-24(1066-7-7-7-20) 2 • •

6GB(Kit of 3) DS

6GB(Kit 0f 3) DS

SS/DSChip

Chip NO.

Brand

N/A

Heat-Sink Package 7-8-7-20(1066-8-8-8-20)

N/A

Heat-Sink Package 8(1066-8-8-8-20)

Timing
Dimm(Bios)

Voltage

1.65 •

1.65 •

support
(Optional)

A* B* C*

•

•

P7P55D LE Motherboard Qualified Vendors Lists (QVL) DDR3-2133MHz
capability for CPU at 2.8 and 2.93GHz

Vendor Part No. Size

G.SKILL F3-17066CL9T-6GB-T 6GB(Kit of 3) DS N/A Heat-Sink Package 9-9-9-24(1066-8-7-7-20) 1.65 • •

SS/DSChip

Brand

Chip NO.

Timing
Dimm(Bios)

Voltage

DIMM socket support
(Optional)

A* B* C*

•

Side(s): SS - Single-sided DS - Double-sided
DIMM support:

• A*

: Supports one (1) module inserted into slot A1 or B1 as Single-channel memory

conguration.

• B*: Supports two (2) modules inserted into the blue slots (A1 and B1) as one pair of
Dual-channel memory conguration.

• C*: Supports four (4) modules inserted into both the blue and the black slots as two

pairs of Dual-channel memory conguration.

• ASUS exclusively provides hyper DIMM support function.

• Hyper DIMM support is subject to the physical characteristics of individual CPUs.

• According to Intel spec denition, DDR3-1600 is supported for one DIMM per channel

only. ASUS exclusively provides two DDR3-1600 DIMM support for each memory
channel.

• According to Intel CPU spec, CPUs with a core frequency of 2.66G support the
maximum DIMM frequency of up to DDR3-1333. To use DIMMs of a higher frequency
with a 2.66G CPU, enable the

DRAM O.C. Prole

feature in BIOS. Refer to section 2.4

Ai Overclock Tuner for details.

• Visit the ASUS website for the latest QVL.

ASUS P7P55D LE 1-15

1.5 Expansion slot

In the future, you may need to install expansion cards. The following sub-sections describe
the slot and the expansion cards that it supports.

Unplug the power cord before adding or removing expansion cards. Failure to do so may
cause you physical injury and damage motherboard components.

1.5.1 Installing an expansion card

To install an expansion card:

1. Before installing the expansion card, read the documentation that came with it and
make the necessary hardware settings for the card.

2. Remove the system unit cover (if your motherboard is already installed in a chassis).

3. Remove the bracket opposite the slot that you intend to use. Keep the screw for later
use.

4. Align the card connector with the slot and press rmly until the card is completely

seated on the slot.

5. Secure the card to the chassis with the screw you removed earlier.

6. Replace the system cover.

1.5.2 Conguring an expansion card

After installing the expansion card, congure it by adjusting the software settings.

1. Turn on the system and change the necessary BIOS settings, if any. See Chapter 2 for
information on BIOS setup.

2. Assign an IRQ to the card.

3. Install the software drivers for the expansion card.

1.5.3 PCI slots

The PCI slots support cards such as a LAN card, SCSI card, USB card, and other cards that

comply with PCI specications.

1.5.4 PCI Express x1 slots

This motherboard supports PCI Express x1 network cards, SCSI cards and other cards that

comply with the PCI Express specications.

1.5.5 PCI Express 2.0 x16 slots

This motherboard has two PCI Express 2.0 x16 slots that support PCI Express x16 2.0

graphic cards complying with the PCI Express specications.

Refer to section 1.2 Motherboard overview for the location of the expansion slot.

• In single VGA card mode, use the PCIe 2.0 x16_1 slot (blue) for a PCI Express x16
graphics card to get better performance.

• We recommend that you provide sufcient power when running CrossFireX™ mode.

• Connect a chassis fan to the motherboard connector labeled CHA_FAN1/2 when using
multiple graphics cards for better thermal environment.

1-16 Chapter 1: Product introduction

1.6 Jumpers

Clear RTC RAM (3-pin CLRTC)

This jumper allows you to clear the Real Time Clock (RTC) RAM in CMOS. You can
clear the CMOS memory of date, time, and system setup parameters by erasing
the CMOS RTC RAM data. The onboard button cell battery powers the RAM data in
CMOS, which include system setup information such as system passwords.

To erase the RTC RAM:

1. Turn OFF the computer and unplug the power cord.

2. Move the jumper cap from pins 1-2 (default) to pins 2-3. Keep the cap on pins 2-3
for about 5-10 seconds, then move the cap back to pins 1-2.

3. Plug the power cord and turn ON the computer.

4. Hold down the <Del> key during the boot process and enter BIOS setup to re-enter
data.

Except when clearing the RTC RAM, never remove the cap on CLRTC jumper default
position. Removing the cap will cause system boot failure!

• If the steps above do not help, remove the onboard battery and move the jumper again
to clear the CMOS RTC RAM data. After the CMOS clearance, reinstall the battery.

• You do not need to clear the RTC when the system hangs due to overclocking. For
system failure due to overclocking, use the C.P.R. (CPU Parameter Recall) feature.
Shut down and reboot the system so the BIOS can automatically reset parameter
settings to default values.

• Due to the chipset behavior, AC power off is required to enable C.P.R. function. You
must turn off and on the power supply or unplug and plug the power cord before
rebooting the system.

ASUS P7P55D LE 1-17

1.7 MemOK! switch

Onboard switch allows you to ne-tune performance when working on a bare or open-case

system. This is ideal for overclockers and gamers who continually change settings to enhance
system performance.

MemOK! switch

Installing DIMMs that are incompatible with the motherboard may cause system boot failure,
and the DRAM_LED near the MemOK! switch lights continuously. Press and hold the
MemOK! switch until the DRAM_LED starts blinking to begin automatic memory compatibility
tuning for successful boot.

• The DRAM_LED also lights when the DIMM is not properly installed. Turn off the
system and reinstall the DIMM before using the MemOK! function.

• Press the MemOK! switch under Windows™ OS environment will reboot the computer
and start memory tuning.

• During the tuning process, the system loads and tests failsafe memory settings. It
takes about 30 seconds for the system to test one set of failsafe settings. If the test
fails, the system reboots and test the next set of failsafe settings. The blinking speed
of the DRAM_LED increases, indicating different test processes.

• If the installed DIMMs still fail to boot after the whole tuning process, the DRAM_LED
lights continuously. Replace the DIMMs with ones recommended in the Memory QVL
(Qualied Vendors Lists) in this user manual or on the ASUS website at
www.asus.com.

• If you turn off the computer and replace DIMMs during the tuning process, the system
continues memory tuning after turning on the computer. To stop memory tuning, turn
off the computer and unplog the power cord for about 5–10 seconds.

• If your system fail to boot due to BIOS overclocking, press the MemOK! switch to boot
and load BIOS default settings. A messgae will appear during POST reminding you
that the BIOS has been restored to its default settings.

• We recommend that you download and update to the latest BIOS version from the
ASUS website at www.asus.com after using the MemOK! function.

1-18 Chapter 1: Product introduction

1.8 Connectors

1.8.1 Rear panel connectors

1. PS/2 mouse port (green). This port is for a PS/2 mouse.

2. LAN (RJ-45) port. This port allows Gigabit connection to a Local Area Network (LAN)

through a network hub. Refer to the table on the next page for the LAN port LED
indicators.

3. PS/2 Keyboard port (purple). This port is for a PS/2 keyboard.
LAN port LED indications

ACT/LINK LED SPEED LED

Status Description Status Description

OFF No link OFF 10 Mbps connection

ORANGE Linked ORANGE 100 Mbps connection

BLINKING Data activity GREEN 1 Gbps connection

ACT/LINK

4. USB 2.0 ports 1 and 2. These two 4-pin Universal Serial Bus (USB) ports connect to

USB 2.0/1.1 devices.

5. Optical S/PDIF Out port. This port connects an external audio output device via an
optical S/PDIF cable.

6. External SATA port. This port connect to an external Serial ATA hard disk drive.

To congure a RAID0 or RAID1, connect external Serial ATA hard disk drives to the

External SATA port .

7. USB 2.0 ports 3, 4, 5 and 6. These four 4-pin Universal Serial Bus (USB) ports
connect to USB 2.0/1.1 devices.

8. USB 2.0 ports 7 and 8. These two 4-pin Universal Serial Bus (USB) ports connect to
USB 2.0/1.1 devices.

9. 8-channel audio ports. These ports connects to a multi-speaker audio system.

LED

LAN port

SPEED

LED

Audio 2, 4, 6 or 8-channel conguration

Port

Light Blue Line In Line In Line In Line In

Lime Line Out Front Speaker Out Front Speaker Out Front Speaker Out

Pink Mic In Mic In Mic In Mic In

Orange – – Center/Subwoofer Center/Subwoofer

Black – Rear Speaker Out Rear Speaker Out Rear Speaker Out

Gray – – – Side Speaker Out

ASUS P7P55D LE 1-19

Headset
2-channel

4-channel 6-channel 8-channel

1.8.2 Internal connectors

1. ATX power connectors (24-pin EATXPWR, 8-pin EATX12V)

These connectors are for ATX power supply plugs. The power supply plugs are

designed to t these connectors in only one orientation. Find the proper orientation and
push down rmly until the connectors completely t.

•

For a fully congured system, we recommend that you use a power supply unit (PSU)

that complies with ATX 12 V Specication 2.0 (or later version) and provides a minimum

power of 600 W.

• Do not forget to connect the 8-pin EATX12V power plug. Otherwise, the system will not
boot.

• If you are uncertain about the minimum power supply requirement for your system,
refer to the Recommended Power Supply Wattage Calculator at http://support.asus.

com/PowerSupplyCalculator/PSCalculator.aspx?SLanguage=en-us for details.

2. CPU, chassis, and power fan connectors
(4-pin CPU_FAN, 4-pin CHA_FAN1, 3-pin CHA_FAN2, 3-pin PWR_FAN)

The fan connectors support cooling fans of 350 mA~1000 mA (12 W max.) or a total
of 1 A~4 A (48 W max.) at +12V. Connect the fan cables to the fan connectors on the
motherboard, making sure that the black wire of each cable matches the ground pin of
the connector.

Do not forget to connect the fan cables to the fan connectors. Insufcient air ow inside the

system may damage the motherboard components. These are not jumpers! Do not place
jumper caps on the fan connectors!

• Only the CPU_FAN, CHA_FAN 1, and CHA_FAN 2 connectors support the FAN Xpert
feature.

• If you install two VGA cards, we recommend that you plug the rear chassis fan cable
to the motherboard connector labeled CHA_FAN1 or CHA_FAN2 for better thermal
environment.

1-20 Chapter 1: Product introduction

3. Front panel audio connector (10-1 pin AAFP)

This connector is for a chassis-mounted front panel audio I/O module that supports
either HD Audio or legacy AC`97 audio standard. Connect one end of the front panel
audio I/O module cable to this connector.

• We recommend that you connect a high-denition front panel audio module to this
connector to avail of the motherboard’s high-denition audio capability.

• If you want to connect a high-denition front panel audio module to this connector, set
the Front Panel Type item in the BIOS setup to [HD Audio]. If you want to connect an
AC'97 front panel audio module to this connector, set the item to [AC97]. By default, this
connector is set to [HD Audio].

4. Serial ATA connectors (7-pin SATA1-6)

These connectors are for the Serial ATA signal cables for Serial ATA hard disk drives
and optical disc drives.

If you installed Serial ATA hard disk drives, you can create a RAID 0, 1, 5, and 10

conguration with the Intel® Matrix Storage Technology through the onboard Intel® P55

chipset.

ASUS P7P55D LE 1-21

• These connectors are set to Standard IDE mode by default. In Standard IDE mode,
you can connect Serial ATA boot/data hard disk drives to these connectors. If you
intend to create a Serial ATA RAID set using these connectors, set the

item in the BIOS to [RAID].

SATA as

• Before creating a RAID set, refer to section
bundled in the motherboard support DVD.

• You must install Windows® XP Service Pack 2 or later version before using Serial ATA
hard disk drives. The Serial ATA RAID feature (RAID 0, 1, 5, and 10) is available only if
you are using Windows® XP SP2 or later version.

• When using hot-plug and NCQ, set the
See section

Storage Conguration

RAID congurations

Congure SATA as

for details.

or the RAID manual

item in the BIOS to [AHCI].

5. System panel connector (20-8 pin PANEL)

This connector supports several chassis-mounted functions.

• System power LED (2-pin PLED)

This 2-pin connector is for the system power LED. Connect the chassis power LED
cable to this connector. The system power LED lights up when you turn on the system
power, and blinks when the system is in sleep mode.

• Hard disk drive activity LED (2-pin IDE_LED)

This 2-pin connector is for the HDD Activity LED. Connect the HDD Activity LED cable

to this connector. The IDE LED lights up or ashes when data is read from or written to

the HDD.

• System warning speaker (4-pin SPEAKER)

This 4-pin connector is for the chassis-mounted system warning speaker. The speaker
allows you to hear system beeps and warnings.

• ATX power button/soft-off button (2-pin PWRSW)

This connector is for the system power button. Pressing the power button turns the
system on or puts the system in sleep or soft-off mode depending on the BIOS settings.
Pressing the power switch for more than four seconds while the system is ON turns the
system OFF.

• Reset button (2-pin RESET)

This 2-pin connector is for the chassis-mounted reset button for system reboot without
turning off the system power.

Congure

1-22 Chapter 1: Product introduction

6. USB connectors (10-1 pin USB910; USB1112; USB1314)

These connectors are for USB 2.0 ports. Connect the USB module cable to any of
these connectors, then install the module to a slot opening at the back of the system

chassis. These USB connectors comply with USB 2.0 specication that supports up to

480 Mbps connection speed.

Never connect a 1394 cable to the USB connectors. Doing so will damage the motherboard!

You can connect the front panel USB cable to the ASUS Q-Connector (USB, blue) rst, and

then install the Q-Connector (USB) to the USB connector onboard if your chassis supports
front panel USB ports.

The USB module is purchased separately.

7. Serial port connector (10-1 pin COM1)

This connector is for a serial (COM) port. Connect the serial port module cable to this
connector, then install the module to a slot opening at the back of the system chassis.

The COM module is purchased separately.

ASUS P7P55D LE 1-23

8. Digital audio connector (4-1 pin SPDIF_OUT)

This connector is for an additional Sony/Philips Digital Interface (S/PDIF) port(s).
Connect the S/PDIF Out module cable to this connector, then install the module to a
slot opening at the back of the system chassis.

The S/PDIF module is purchased separately.

9. Optical drive audio connector (4-pin CD)

This connector allows you to receive stereo audio input from sound sources such as a
CD-ROM, TV tuner, or MPEG card.

1-24 Chapter 1: Product introduction

10. JMicron® JMB361 IDE Connector (40-1 pin PRI_IDE [Blue])

The onboard IDE connector is for the Ultra DMA 133/100/66 signal cable. There are
three connectors on each Ultra DMA 133/100/66 signal cable: blue, black, and gray.
Connect the blue connector to the motherboard’s IDE connector, then select one of the

following modes to congure your device.

Drive jumper setting Mode of

Cable connector

device(s)

Single device Cable-Select or Master - Black

Two devices Cable-Select Master Black

Slave Gray

Master Master Black or gray

Slave Slave

• Pin 20 on the IDE connector is removed to match the covered hole on the Ultra DMA
cable connector. This prevents incorrect insertion when you connect the IDE cable.

• Use the 80-conductor IDE cable for Ultra DMA 133/100/66 IDE devices.

If any device jumper is set as “Cable-Select”, ensure that all other device jumpers have the
same setting.

ASUS P7P55D LE 1-25

1.9 Installing an operating system

This motherboard supports Windows® XP/ 64-bit XP/ Vista™/ 64-bit Vista™/ 7/ 64-bit 7
operating systems (OS). Always install the latest OS version and corresponding updates to

maximize the features of your hardware.

• Motherboard settings and hardware options vary. Use the setup procedures presented
in this chapter for reference only. Refer to your OS documentation for detailed
information.

• Ensure that you install the Windows® XP Service Pack 2 or later versions before
installing the drivers for better compatibility and system stability.

1.10 Support DVD information

The support DVD that comes with the motherboard package contains the drivers, software
applications, and utilities that you can install to avail all motherboard features.

The contents of the support DVD are subject to change at any time without notice. Visit the
ASUS website at www.asus.com for updates.

1.10.1 Running the support DVD

Place the support DVD into the optical drive. The DVD automatically displays the Drivers
menu if Autorun is enabled in your computer. Click each menu tab and select the items you
want to install.

The Drivers menu shows the available
device drivers if the system detects
installed devices. Install the necessary
drivers to use the devices.

The Utilities
menu shows the
applications and
other software that
the motherboard
supports.

Click an item
to install

The Make disk menu
contains items to
create the RAID/AHCI
driver disk.

The Manual menu contains
the list of supplementary user
manuals. Click an item to open
the folder of the user manual.

Click the Contact
tab to display the
ASUS contact
information.

Click an icon
to display DVD/
motherboard
information

If Autorun is NOT enabled in your computer, browse the contents of the Support DVD to

locate the le ASSETUP.EXE from the BIN folder. Double-click the ASSETUP.EXE to run

the DVD.

1-26 Chapter 1: Product introduction

Chapter 2

BIOS setup

2.1 Managing and updating your BIOS

Save a copy of the original motherboard BIOS le to a USB ash disk in case you need to

restore the BIOS in the future. Copy the original motherboard BIOS using the ASUS Update
utility.

2.1.1 ASUS Update

The ASUS Update is a utility that allows you to manage, save, and update the motherboard
BIOS in Windows® environment.

• ASUS Update requires an Internet connection either through a network or an Internet
Service Provider (ISP).

• This utility is available in the support DVD that comes with the motherboard package.

Installing ASUS Update

To install ASUS Update:

1. Place the support DVD in the optical drive.

2. From the Main menu, click the Utilities tab, and then click Install ASUS Update
VX.XX.XX.

3. The ASUS Update utility is copied to your system.

Quit all Windows® applications before you update the BIOS using this utility.

Updating the BIOS

To update the BIOS:

1. From the Windows® desktop, click Start > Programs > ASUS > ASUSUpdate >
ASUSUpdate to launch the ASUS Update utility.

2. From the dropdown list, select any of the updating process.

Updating from the Internet

a. Select Update BIOS from the Internet, and then click Next.

b. Select the ASUS FTP site nearest you to avoid network trafc, or click Auto

elect. Click Next.

c. From the FTP site, select the BIOS

version that you wish to download, then click Next.

ASUS P7P55D LE 2-1

Updating from a BIOS file

a. Select Update BIOS from a le, then click Next.

b. Locate the BIOS le from the Open window, then click Open.

3. Follow the onscreen instructions to complete the update process.

The ASUS Update utility is capable of updating itself through the Internet.
Always update the utility to avail all its features.

Ensure to load the BIOS default settings to ensure system compatibility and
stability. Select the Load Setup Defaults item under the Exit menu. See section

Exit Menu for details.

2.1.2 ASUS EZ Flash 2

The ASUS EZ Flash 2 feature allows you to update the BIOS without using an OS-based
utility.

Before you start using this utility, download the latest BIOS le from the ASUS website at

www.asus.com.

To update the BIOS using EZ Flash 2:

1. Insert the USB ash disk that contains the latest BIOS le to the USB port, then launch

EZ Flash 2 in any of these two ways:

• Press <Alt> + <F2> during POST.

• Enter the BIOS setup program. Go to the Tools menu to select EZ Flash 2 and
press <Enter> to enable it.
Press <Tab> to switch between drives until the correct BIOS le is found.

ASUSTek EZ Flash 2 BIOS ROM Utility V3.36

FLASH TYPE: WOINBOND W25X80

Current ROM

BOARD: P7P55D LE
VER: 0212 (H:00 B:06)
DATE: 06/11/2009

PATH: A:\

A:

Note

[Enter] Select or Load [Tab] Switch [V] Drive Info

[Up/Down/Home/End] Move [B] Backup [ESC] Exit

2-2 Chapter 2: BIOS information

Update ROM

BOARD: Unknown
VER: Unknown
DATE: Unknown

2. When the correct BIOS le is found, EZ Flash 2 performs the BIOS update process

and automatically reboots the system when done.

• Only a USB ash disk with FAT 32/16 format and single partition can support the ASUS

EZ Flash 2 utility.

• Do not shut down or reset the system while updating the BIOS to prevent system boot
failure!

2.1.3 ASUS CrashFree BIOS 3 utility

The ASUS CrashFree BIOS 3 utility is an auto recovery tool that allows you to

restore the BIOS le when it fails or gets corrupted during the updating process.
You can restore a corrupted BIOS le using the motherboard support DVD or a
USB ash drive that contains the BIOS le.

The BIOS le in the motherboard support DVD may be older than the BIOS le
published on the ASUS ofcial website. If you want to use the newer BIOS le,
download the le at support.asus.com and save it to a USB ash drive.

Recovering the BIOS

To recover the BIOS

1. Turn on the system.

2. Insert the motherboard support DVD to the optical drive, or the USB ash drive
containing the BIOS le to the USB port.

3. The utility automatically checks the devices for the BIOS le. When found, the utility
reads the BIOS le and starts ashing the corrupted BIOS le.

4. Turn off the system after the utility completes the updating process and power on
again.

5. The system requires you to enter BIOS Setup to recover BIOS setting. To ensure
system compatibility and stability, we recommend that you press <F2> to load default
BIOS values.

DO NOT shut down or reset the system while recovering the BIOS! Doing so
can cause system boot failure!

ASUS P7P55D LE 2-3

2.2 BIOS setup program

Use the BIOS Setup program to update the BIOS or congure its parameters. The BIOS

screens include navigation keys and brief online help to guide you in using the BIOS Setup
program.

Entering BIOS Setup at startup

To enter BIOS Setup at startup:

• Press <Delete> during the Power-On Self Test (POST). If you do not press <Delete>,
POST continues with its routines.

Entering BIOS Setup after POST

To enter BIOS Setup after POST:

• Press <Ctrl>+<Alt>+<Del> simultaneously.

• Press the reset button on the system chassis.

• Press the power button to turn the system off then back on. Do this option only if you

failed to enter BIOS Setup using the rst two options.

Using the power button, reset button, or the <Ctrl>+<Alt>+<Del> keys to force
reset from a running operating system can cause damage to your data or system. We
recommend to always shut down the system properly from the operating system.

• The default BIOS settings for this motherboard apply for most conditions to ensure
optimum performance. If the system becomes unstable after changing any BIOS
settings, load the default settings to ensure system compatibility and stability. Select the
Load Setups Default item under the Exit Menu. See section 2.9 Exit menu.

• The BIOS setup screens shown in this section are for reference purposes only, and may
not exactly match what you see on your screen.

• Visit the ASUS website at www.asus.com to download the latest BIOS le for this

motherboard.

2.3 Main menu

When you enter the BIOS Setup program, the Main menu screen appears, giving
you an overview of the basic system information. You can also set the system time
and date and BIOS language in this menu.

Refer to BIOS menu screen for information on the menu screen items and how
to navigate through them.

Main Ai Tweaker Advanced Power Boot Tools Exit

System Time [13:51:25]
System Date [Thu 07/09/2009]

Language [English]

SATA1 [HDT722516DLA380]
SATA2 [Not Detected]
SATA3 [ATAPI DVD DH1]
SATA4 [Not Detected]
SATA5 [Not Detected]
SATA6 [Not Detected]

Storage Conguration
System Information

2-4 Chapter 2: BIOS information

BIOS SETUP UTILITY

Use [ENTER], [TAB]
or [SHIFT-TAB] to

select a eld.

Use [+] or [-] to

congure system Date.

2.3.1 SATA 1-6

While entering Setup, the BIOS automatically detects the presence of IDE/SATA
devices. There is a separate submenu for each IDE/SATA device. Select a device
item then press <Enter> to display the SATA device information.

Main

SATA 1

Device : Hard Disk
Vendor : HDT722516DLA380
Size : 164.7GB
LBA Mode : Supported
Block Mode : 16Sectors
PIO Mode : 4
Async DMA : MultiWord DMA-2
Ultra DMA : Ultra DMA-5

SMART Monitoring:Supported

Type [Auto]

LBA/Large Mode [Auto]

Block(Multi-Sector Transfer)M [Auto]
PIO Mode [Auto]
DMA Mode [Auto]

SMART Monitoring [Auto]

32Bit Data Transfer [Enabled]

v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.

BIOS SETUP UTILITY

S e l e c t t h e t y p e
of d evi ce c onn ec ted
to the system.

Select Screen

←→

Select Item

↑↓

+- Change Field

F1 General Help
F10 Save and Exit
ESC Exit

The BIOS automatically detects the values opposite the dimmed items (Device,

Vendor, Size, LBA Mode, Block Mode, PIO Mode, Async DMA, Ultra DMA, and
SMART monitoring). These values are not user-congurable. These items show

N/A if no IDE device is installed in the system.

Type [Auto]

Allows you to select the type of SATA drive installed.

[Not Installed] Select this option if no SATA drive is installed.

[Auto] Allows automatic selection of the appropriate SATA device type.

[CDROM] Select this option if you are specically conguring a CD-ROM drive.

[ARMD] Select [ARMD] (ATAPI Removable Media Device) if your device is either a

ZIP, LS-120, or MO drive.

LBA/Large Mode [Auto]

Enables or disables the LBA (Logical Block Addressing) mode.

[Auto] Select [Auto] to enable the LBA mode (Logical Block Addressing mode)

[Disabled] Disables this function.

if the device supports this mode, and if the device was not previously
formatted with LBA mode disabled.

Block (Multi-Sector Transfer) M [Auto]

Enables or disables data multi-sectors transfers.

[Auto] When set to [Auto], the data transfer from and to the device occurs in

[Disabled] When set to [Disabled], the data transfer from and to the device occurs one

ASUS P7P55D LE 2-5

multiple sectors at a time if the device supports multi-sector transfer
feature.

sector at a time.

PIO Mode [Auto]

[Auto] Allows automatic selection of the PIO (Programmed input/output) modes,

[0] [1] [2] [3] [4] Set the PIO mode to Mode 0, 1, 2, 3, or 4.

which correspond to different data transfer rates.

DMA Mode [Auto]

DMA (Direct Memory Access) allows your computer to transfer data to and from
the hardware devices installed with much less CPU overhead.

The DMA mode consists of SDMA (single-word DMA), MDMA (multi-word DMA),
and UDMA (Ultra DMA). Setting to [Auto] allows automatic selection of the DMA
mode.

SMART Monitoring [Auto]

[Auto] Allows automatic selection of the S.M.A.R.T (Smart Monitoring, Analysis,

[Enabled] Enables the S.M.A.R.T feature.

[Disabled] Disables the S.M.A.R.T feature.

and Reporting Technology).

32Bit Data Transfer [Enabled]

[Enabled] Sets the IDE controller to combine two 16-bit reads from the hard disk

[Disabled] Disables this function.

into a single 32-bit double word transfer to the processor. This makes

more efcient use of the PCI bus as fewer transactions are needed for the

transfer of a particular amount of data.

2.3.2 Storage Conguration

The Storage Conguration menu allows you to congure your storage devices.

Select an item then press <Enter> to display the submenu.

Main

Storage Conguration

SATA Conguraton [Enhanced]
Congure SATA as [IDE]

Hard Disk Write Protect [Disabled]
IDE Detect Time Out (Sec) [35]

2-6 Chapter 2: BIOS information

BIOS SETUP UTILITY

Set [Compatible Mode]

when L egacy O S (i .e.

WIN ME, 98, NT4.0, MS
DOS) is used.

Se t [E nha nc ed M od e]
when N ative O S (i .e.
WIN2000, Win XP, Vista
is used.

SATA Conguration [Enhanced]

Conguration options: [Disabled] [Compatible] [Enhanced]

Configure SATA as [IDE]

Sets the conguration for the Serial ATA connectors supported by the
Southbridge chip. Conguration options: [IDE] [RAID] [AHCI]

• If you want to use the Serial ATA hard disk drives as Parallel ATA physical
storage devices, keep the default setting [IDE].

• If you want the Serial ATA hard disk drives to use the Advanced Host
Controller Interface (AHCI), set this item to [AHCI]. The AHCI allows
the onboard storage driver to enable advanced Serial ATA features that
increases storage performance on random workloads by allowing the drive

to internally optimize the order of commands.

• If you want to create a RAID 0, RAID 1, RAID 5, RAID 10, or the Intel

Matrix Storage Technology conguration from the Serial ATA hard disk

drives, set this item to [RAID].

®

Hard Disk Write Protect [Disabled]

Disables or enables device write protection. This will be effective only if the device

is accessed through BIOS. Conguration option: [Disabled] [Enabled]

IDE Detect Time Out (Sec) [35]

Selects the time out value for detecting ATA/ATAPI devices. Conguration options:

[0] [5] [10] [15] [20] [25] [30] [35]

2.3.3 AHCI Conguration

This menu is the section for AHCI conguration. It appears only when you set the
item Congure SATA as from the sub-menu of SATA Conguration to [AHCI].

Main

AHCI Settings

SATA Port1 [Not Detected]
SATA Port2 [Not Detected]
SATA Port3 [Not Detected]
SATA Port4 [Not Detected]
SATA Port5 [Not Detected]
SATA Port6 [Not Detected]

BIOS SETUP UTILITY

So me S AT A C D/ DV D i n
AHCI mode need to wait

ready longer.

ASUS P7P55D LE 2-7

SATA Port1–6 [XXXX]

Displays the status of auto-detection of SATA devices.

Main

SATA Port1

Device :Not Detected

SATA Port1 [Auto]

SMART Monitoring [Enabled]

BIOS SETUP UTILITY

S e le c t t h e t y p e o f
dev ice s co nne cted t o
the system.

SATA Port1 [Auto]

Allows you to select the type of device connected to the system.

Conguration options: [Auto] [Not Installed]

SMART Monitoring [Enabled]

Allows you to set the Self-Monitoring, Analysis and Reporting Technology.

Congration options: [Disabled] [Enabled]

2.3.4 System Information

This menu gives you an overview of the general system specications. The
BIOS automatically detects the BIOS information, CPU specication, and system

memory in this menu.

Main

BIOS Information

BIOS Version : 0120
BIOS Build Date : 07/30/09

Processor

Type : Intel (R) Core(TM) CPU 860 @ 2.80GHz
Speed : 2808MHz

System Memory

Usable Size : 4024MB

BIOS SETUP UTILITY

2-8 Chapter 2: BIOS information

2.4 Ai Tweaker menu

The Ai Tweaker menu items allow you to congure overclocking-related items.

Be cautious when changing the settings of the Ai Tweaker menu items. Incorrect

eld values can cause the system to malfunction.

The conguration options for this chapter vary depending on the CPU and

DIMM model you installed on the motherboard.

Main Ai Tweaker Advanced Power Boot Tools Exit

Congure System Performance Settings

Ai Overclock Tuner [Auto]

CPU Ratio Setting [Auto]

Intel(R) SpeedStep(TM) Tech [Enabled]
Intel(R) TurboMode Tech [Enabled]

Xtreme Phase Full Power Mode [Auto]
DRAM Frequency [Auto]
QPI Frenquency [Auto]

DRAM Timing Control

CPU Differential Amplitude [Auto]
CPU Clock Skew [Auto]

******* Please key in numbers directly! *******

CPU Voltage Mode [Offset]
Offset Voltage [Auto]
IMC Voltage [Auto]
DRAM Voltage [16V]
CPU PLL Voltage [Auto]

v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.

BIOS SETUP UTILITY

Press ENTER to run the
utility to Tuner BCLK.

←→

Select Item

↑↓

Enter Go to Sub Screen
F1 General Help
F10 Save and Exit
ESC Exit

Scroll down to display the following items:

PCH Voltage [Auto]
DRAM DATA REF Voltage on CHA [Auto]
DRAM DATA REF Voltage on CHB [Auto]

***********************************************

Load-Line Calibration [Auto]
CPU Spread Spectrum [Auto]
PCIE Spread Spectrum [Auto]

v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.

Select Screen

ASUS P7P55D LE 2-9

2.4.1 Ai Overclock Tuner [Auto]

Allows selection of CPU overclocking options to achieve desired CPU internal

frequency. Select either one of the preset overclocking conguration options:

Manual Allows you to individually set overclocking parameters.

Auto Loads the optimal settings for the system.

D.O.C.P Overclocks DRAM frequency by adjusting BCLK frequency.

X.M.P. If you install memory module(s) supporting the eXtreme

The conguration options for the following sub-item vary depending on the

DIMMs you install on the motherboard.

DRAM O.C. Profile [DDR3-1600MHz]

This item appears only when you set the Ai Overclock Tuner item to

[D.O.C.P.] and allows you to select a DRAM O.C. prole, which applies

different settings to DRAM frequency, DRAM timing and DRAM voltage.

Conguration options: [DDR3-1600MHz] [DDR3-1800MHz] [DDR3-1866MHz]
[DDR3-2000MHz] [DDR3-2133MHz]

eXtreme Memory Profile [Disabled]

This item appears only when you set the Ai Overclock Tuner item to [X.M.P.]

To obtain the best performance of the X.M.P. DIMM or 1600MHz DIMM, install

only one DIMM on each memory channel.

Memory Prole (X.M.P.) Technology, choose this item to set the
prole(s) supported by your memory module(s) for optimizing

the system performance.

2.4.2 CPU Ratio Setting [Auto]

Allows you to adjust the ratio between CPU Core Clock and BCLK Frequency.
Use the <+> and <-> keys to adjust the value. The valid value ranges differently
according to your CPU model.

2.4.3 Intel(R) SpeedStep(TM) Tech [Enabled]

When set to [Disabled], the CPU runs at its default speed. When set to [Enabled],

the CPU speed is controlled by the operating system. Conguration options:

[Disabled] [Enabled]

2.4.4 Intel(R) TurboMode Tech [Enabled]

This item appears only if you set the Ratio CMOS Setting item to [Auto]. Turbo

mode allows processor cores to run faster than marked frequency in specic
condition. Conguration options: [Disabled] [Enabled]

2-10 Chapter 2: BIOS information

2.4.5 Xtreme Phase Full Power Mode [Auto]

[Auto] Automatic conguration.

[Enabled] Enables Full Power Mode to ensure the best CPU overclocking

performance.

The following two items appear only when you set the Ai Overclock Tuner item
to [Manual], [D.O.C.P.] or [X.M.P.].

BCLK Frequency [XXX]

Allows you to adjust the Internal Base Clock (BCLK). Use the <+> and <-> keys to
adjust the value. You can also type the desired value using the numeric keypad.
The values range from 80 to 500.

PCIE Frequency [Auto]

Allows you to set the PCI Express frequency. Use the <+> and <-> keys to adjust
the PCIE frequency.

Xtreme Phase Full Power Mode [Auto]

Conguration options: [Auto] [Disabled]

2.4.6 DRAM Frequency [Auto]

Allows you to set the DDR3 operating frequency.

Conguration options: [Auto] [DDR3-800MHz] [DDR3-1066MHz] [DDR3-1333MHz]

The DRAM Frequency conguration options vary with the BCLK Frequency item

settings.

Selecting a very high DRAM frequency may cause the system to become
unstable! If this happens, revert to the default setting.

2.4.7 QPI Frequency [Auto]

Allows you to set the QPI operating frequency.

Conguration options: [Auto] [4270MHz] [4800MHz]

2.4.8. DRAM Timing Control [Auto]

The items in this menu allow you to set the DRAM timing control features.

The conguration options for some of the following items vary depending on the

DIMMs you install on the motherboard.

1st Information: 7-7-7-20-4-60-8-5-20

The values vary depending on your settings of the following sub-items:

DRAM CAS# Latency [Auto]

Conguration options: [Auto] [3 DRAM Clock] [4 DRAM Clock] – [10 DRAM

Clock] [11 DRAM Clock]

ASUS P7P55D LE 2-11

DRAM RAS# to CAS# Delay [Auto]

Conguration options: [Auto] [3 DRAM Clock] [4 DRAM Clock] – [9 DRAM

Clock] [15 DRAM Clock]

DRAM RAS# PRE Time [Auto]

Conguration options: [Auto] [3 DRAM Clock] [4 DRAM Clock] – [9 DRAM

Clock] [15 DRAM Clock]

DRAM RAS# ACT Time [Auto]

Conguration options: [Auto] [3 DRAM Clock] [4 DRAM Clock] – [30 DRAM

Clock] [31 DRAM Clock]

DRAM RAS# to RAS# Delay [Auto]

Conguration options: [Auto] [1 DRAM Clock] – [7 DRAM Clock]

DRAM REF Cycle Time [Auto]

Conguration options: [Auto] [30 DRAM Clock] [36 DRAM Clock]
[48 DRAM Clock] [60 DRAM Clock] [72 DRAM Clock] [82 DRAM Clock]
[88 DRAM Clock] [90 DRAM Clock] [100 DRAM Clock] [110 DRAM Clock]
[122 DRAM Clock] [132 DRAM Clock] [140 DRAM Clock] [150 DRAM Clock]
[160 DRAM Clock] [170 DRAM Clock] [180 DRAM Clock]

DRAM WRITE Recovery Time [Auto]

Conguration options: [Auto] [1 DRAM Clock] – [18 DRAM Clock]

DRAM READ to PRE Time [Auto]

Conguration options: [Auto] [1 DRAM Clock] – [15 DRAM Clock]

DRAM FOUR ACT WIN Time [Auto]

Conguration options: [Auto] [1 DRAM Clock] – [63 DRAM Clock]

2nd Information: 3N-255-255

The values vary depending on your settings of the following sub-items:

DRAM Timing Mode [Auto]

Conguration options: [Auto] [1N] [2N] [3N]

DRAM Round Trip Latency on CHA [Auto]

[Auto] [Advance 15 Clock]–[Advance 1 Clock] [Normal] [Delay 1 Clock]
[Delay 15 Clock]

DRAM Round Trip Latency on CHB [Auto]

[Auto] [Advance 15 Clock]–[Advance 1 Clock] [Normal] [Delay 1 Clock]
[Delay 15 Clock]

3rd Information: 8-8-25-17-17-17-9-9-6-9-9-6

The values vary depending on your settings of the following sub-items:

DRAM WRITE to READ Delay(DD) [Auto]

Conguration options: [Auto] [1 DRAM Clock] – [8 DRAM Clock]

DRAM WRITE to READ Delay(DR) [Auto]

Conguration options: [Auto] [1 DRAM Clock] – [8 DRAM Clock]

DRAM WRITE to READ Delay(SR) [Auto]

Conguration options: [Auto] [10 DRAM Clock] – [22 DRAM Clock]

2-12 Chapter 2: BIOS information

DRAM READ to WRITE Delay(DD) [Auto]

Conguration options: [Auto] [2 DRAM Clock] – [14 DRAM Clock]

DRAM READ to WRITE Delay(DR) [Auto]

Conguration options: [Auto] [2 DRAM Clock] – [14 DRAM Clock]

DRAM READ to WRITE Delay(SR) [Auto]

Conguration options: [Auto] [2 DRAM Clock] – [14 DRAM Clock]

DRAM READ to READ Delay(DD) [Auto]

Conguration options: [Auto] [2 DRAM Clock] – [9 DRAM Clock]

DRAM READ to READ Delay(DR) [Auto]

Conguration options: [Auto] [2 DRAM Clock] – [9 DRAM Clock]

DRAM READ to READ Delay(SR) [Auto]

Conguration options: [Auto] [4 DRAM Clock] [6 DRAM Clock]

DRAM WRITE to WRITE Delay(DD) [Auto]

Conguration options: [Auto] [2 DRAM Clock] – [9 DRAM Clock]

DRAM WRITE to WRITE Delay(DR) [Auto]

Conguration options: [Auto] [2 DRAM Clock] – [9 DRAM Clock]

DRAM WRITE to WRITE Delay(SR) [Auto]

Conguration options: [Auto] [4 DRAM Clock] [6 DRAM Clock]

2.4.9 CPU Differential Amplitude [Auto]

Different AMP might enhance BCLK overclocking ability.

Conguration options: [Auto] [700mV] [800mV] [900mV] [1000mV]

2.4.10 CPU Clock Skew [Auto]

Adjusting this item may help enhancing BCLK overclocking ability. You may need
to adjust the NB Clock Skew item at the same time.

Conguration options: [Auto] [Normal] [Delay 100ps]–[Delay 1500ps]

Some of the following items are adjusted by typing the desired values using
the numeric keypad and press the <Enter> key. You can also use the <+> and
<-> keys to adjust the value. To restore the default setting, type [auto] using the
keyboard and press the <Enter> key.

2.4.11 CPU Voltage Mode [Offset]

Allows you to set the CPU Voltage Mode. Different sub-items appear according to
the CPU Voltage Mode item setting. Conguration options: [Offset] [Manual]

Offset Voltage [Auto]

This item appears only when you set the CPU Voltage Mode item to [Offset] and
allows you to set the Offset voltage. The values range from 0.00625V to 0.50000V
with a 0.00625V interval.

Offset Sign [-]

This item appears only when you set the Offset Voltage item to a value other than [Auto].

[+] To offset the voltage by a positive value.

[–] To offset the voltage by a negative value.

ASUS P7P55D LE 2-13

Fixed Voltage [Auto]

This item appears only whne you set the CPU Voltage Mode item to [Manual] and

allows you to set a xed CPU voltage. The values range from 0.85V to 1.70V* with

a 0.00625V interval.

Refer to the CPU documentation before setting the CPU Vcore voltage. Setting
a high VCore voltage may damage the CPU permanently, and setting a low

VCore voltage may make the system unstable.

2.4.12 IMC Voltage [Auto]

Allows you to set the CPU Integrated Memory Controller voltage. The values range
from 1.1V to 1.45V* with a 0.05V interval.

2.4.13 DRAM Voltage [Auto]

Allows you to set the DRAM voltage. The values range from 1.5V to 2.2V* with a

0.1V interval.

According to Intel CPU spec, DIMMs with voltage requirement over 1.65V may
damage the CPU permanently. We recommend you install the DIMMs with the
voltage requirement below 1.65V.

2.4.14 CPU PLL Voltage [Auto]

Allows you to set the CPU PLL voltage. The values range from 1.8V to 2.1V with a

0.1V interval.

2.4.15 PCH Voltage [Auto]

Allows you to set the Platform Controller Hub voltage. The values range from

1.05V to 1.15V with a 0.10V interval.

The system may need better cooling system to work stably under high voltage
settings.

2.4.16 DRAM DATA REF Voltage on CHA/B [Auto]

Allows you to set the DRAM DATA Reference Voltage on Channel A/B/C. The
values range from 0.395x to 0.630x with a 0.005x interval. Different ratio might
enhance DRAM overclocking ability.

2-14 Chapter 2: BIOS information

2.4.17 Load-Line Calibration [Auto]

[Auto] Automatic conguration.

[Disabled] Follow Intel specications.

[Enabled] Improve CPU VDroop directly.

2.4.18 CPU Spread Spectrum [Auto]

[Auto] Automatic conguration.

[Disabled] Enhances the BCLK overclocking ability.

[Enabled] Sets to [Enabled] for EMI control.

2.4.19 PCIE Spread Spectrum [Auto]

[Auto] Automatic conguration.

[Disabled] Enhances the PCIE overclocking ability.

[Enabled] Sets to [Enabled] for EMI control.

ASUS P7P55D LE 2-15

2.5 Advanced menu

The Advanced menu items allow you to change the settings for the CPU and other
system devices.

Be cautious when changing the settings of the Advanced menu items. Incorrect

eld values can cause the system to malfunction.

Main Ai Tweaker Advanced Power Boot Tools Exit

CPU Conguration
North Bridge Conguration
Onboard Devices Conguration
USB Conguration

PCIPnP

Intel VT-d [Disabled]

v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.

2.5.1 CPU Conguration

The items in this menu show the CPU-related information that the BIOS
automatically detects.

The items shown in this screen may be different due to the CPU you installed.

BIOS SETUP UTILITY

Congure CPU.

Sel ect S cre en

←→

S e l e c t I t e m

↑↓

Enter Go to Sub Screen
F1 G e ne ra l H el p
F10 S ave an d E xit
ESC Exit

Advanced

Congure advanced CPU settings

Module Version:01.04

Manufacturer:Intel

Brand String:Intel(R) Core(TM) CPU 860@ 2.80GHz

Frequency :2.80GHz
BCLK Speed :133MHz
Cache L1 :128 KB
Cache L2 :1024 KB
Cache L3 :8192 KB
Ratio Status:Unlocked (Min:09, Max:16)
Ratio Actual Value:16
CPUID: 20651

CPU Ratio Setting [Auto]

C1E Support [Enabled]
Hardware Prefetcher [Enabled]
Adjacent Cache Line Prefetch [Enabled]
Max CPUID Value Limit [Disabled]
Intel(R) Virtualization Tech [Enabled]

BIOS SETUP UTILITY

Sets the ratio between
CPU Core Clock and the
BCLK Frequency.
NO TE : If a n i nv al id
ratio is set in CMO S
t h e n a c t u a l a n d
se t po in t v al u es m ay
differ.

NO TE : Pl ea se k ey i n
ratio numbers directly

Select Screen

←→

Select Item

↑↓

F1 General Help
F10 Save and Exit
ESC Exit

Scroll down to display the following items:

CPU TM function [Enabled]
Execute-Disable Bit Capability [Enabled]

Intel(R) HT Technology [Enabled]

Active Processor Cores [All]
A20M [Disabled]
Intel(R) SpeedStep(TM) Tech [Enabled]
Intel(R) Turbo Mode tech [Enabled]
Intel(R) C-STATE Tech [Disabled]

2-16 Chapter 2: BIOS information

v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.

CPU Ratio Setting [Auto]

Allows you to adjust the ratio between CPU Core Clock and BCLK Frequency.
Use the <+> and <-> keys to adjust the value. The valid value ranges differently
according to your CPU model.

C1E Support [Enabled]

[Enabled] Enables the C1E support function. This item should be enabled in order to

[Disabled] Disables this function.

enable the Enhanced Halt Sate.

Hardware Prefetcher [Enabled]

[Enabled] Enables the Hardware Prefetcher function. This item should be enabled

[Disabled] Disables this function.

in order to enable the L2 cache (MLC) Streamer Prefetcher for tuning

performance of the specic application.

Adjacent Cache Line Prefetcher [Enabled]

[Enabled] Enables the Adjacent Cache Line Prefetcher function. This item should be

[Disabled] Disables this function.

enabled in order to enable the L2 cache (MLC) Spatial Prefetcher for tuning

performance of the specic application.

Max CPUID Value Limit [Disabled]

[Enabled] Allows legacy operating systems to boot even without support for CPUs

[Disabled] Disables this function.

with extended CPUID functions.

Intel(R) Virtualization Tech [Enabled]

[Enabled] Allows a hardware platform to run multiple operating systems separately

[Disabled] Disables this function.

and simultaneously, enabling one system to virtually function as several
systems.

CPU TM function [Enabled]

[Enabled] Enables the overheated CPU to throttle its clock speed to cool down.

[Disabled] Disables this function.

Execute Disable Bit Capability [Enabled]

[Enabled] Enables the No-Execution Page Protection Technology.

[Disabled] Forces the XD feature ag to always return to zero (0).

Intel(R) HT Technology [Enabled]

[Enabled] Enables the Intel Hyper-Threading Technology.

[Disabled] Only one thread per activated CPU core is enabled.

ASUS P7P55D LE 2-17

Active Processor Cores [All]

[All] Activate all CPU cores in the processor package.

[1] Activate only 1 CPU core in the processor package.

[2] Activate 2 CPU cores in the processor package.

A20M [Disabled]

[Enabled] Legacy OSes and APs may need this function enabled.

[Disabled] Disables this function.

Intel(R) SpeedStep (TM) Tech [Enabled]

[Enabled] The CPU speed is controlled by the operating system.

[Disabled] The CPU runs at its default speed.

Intel(R) TurboMode tech [Enabled]

[Enabled] Allows processor cores to run faster than marked frequency in specic

[Disabled] Disables this function.

condition.

Intel(R) C-STATE Tech [Disabled]

[Enabled] Allows the CPU to save more power under idle mode. Enable this item only

[Disabled] Disables this function.

when you install a C-State Technology-supported CPU.

C State package limit setting [Auto]

This item appears only when you set the Intel(R) C-STATE Tech item to
[Enabled]. We recommend that you set this item to [Auto] for BIOS to

automatically detect the C-State mode supported by your CPU. Conguration

options: [Auto] [C1] [C3] [C6]

2.5.2 North Bridge Conguration

The North Bridge Conguration menu allows you to change the advanced chipset

settings.

Advanced

North Bridge Chipset Conguration

IMC Type : Lynneld

Memory Remap Feature [Enabled]

PCI MMIO Allocation: 4GB To 3072MB

Memory Remap Feature [Enabled]

[Disabled] Do not allow remapping of memory.
[Enabled] Allows for the segment of system memory that was previously

overwritten by PCI devices to be remapped above the total
physical memory.

2-18 Chapter 2: BIOS information

BIOS SETUP UTILITY

E N A B L E : A l l o w

r e m a p p i n g o f

overlapped PCI memory
a b o v e t h e t o t a l
physical memory.

DISABLE: Do not allow

remapping of memory.

2.5.3 Onboard Devices Conguration

Advanced

Onboard Devices Conguration

HDA Controller [Enabled]
Front Panel Type [HD Audio]
Realtek LAN [Enabled]
LAN Boot ROM [Disabled]
J-Micron eSATA/PATA Controller [IDE Mode]
Serial Port1 Address [3F8/IRQ4]

BIOS SETUP UTILITY

Enabled
Disabled

Options

HDA Controller [Enabled]

[Enabled] Enables the High Denition Audio Controller.

[Disabled] Disables the controller.

Front Panel Type [HD Audio]

[AC97] Set the front panel audio connector (AAFP) mode to legacy AC’97
[HD Audio] Set the front panel audio connector (AAFP) mode to high-

denition audio.

Realtek LAN [Enabled]

[Enabled] Enables Realtek LAN Controller

[Disabled] Disables Realtek LAN Controller.

LAN Boot ROM [Disabled]

This item appears only when you enable the previous item(s).
[Disabled] Disables Realtek LAN Boot ROM.
[Enabled] Enables Realtek LAN Boot ROM.

J-Micron eSATA/PATA Controller [IDE Mode]

[Disabled] Disables the J-Micron controller.

[IDE Mode] Set to [IDE Mode] when you want to use the Serial ATA hard disk drives as

[AHCI Mode] Set to [AHCI] when you want the SATA hard disk drives to use the AHCI

Parallel ATA physical storage devices.

(Advabced Host Controller Interface). The AHCI allows the onboard storage
driver to enable advanced Serial ATA features that increases storage
performance on random workloads by allowing the drive to internally

optimize the order of commands.

Serial Port1 Address [3F8/IRQ4]

Allows you to select the Serial Port1 base address.

Conguration options: [Disabled] [3F8/IRQ4] [2F8/IRQ3] [3E8/IRQ4] [2E8/IRQ3]

ASUS P7P55D LE 2-19

2.5.4 USB Conguration

The items in this menu allows you to change the USB-related features. Select an

item then press <Enter> to display the conguration options.

Advanced

USB Conguration

Module Version - 2.24.5-13.4

USB Devices Enabled:

2 Hubs

USB Functions [Enabled]

Legacy USB Support [Auto]

BIOS EHCI Hand-Off [Enabled]

The USB Devices Enabled item shows the auto-detected values. If no USB
device is detected, the item shows None.

BIOS SETUP UTILITY

Disabled
Enabled

Options

USB Functions [Enabled]

[Enabled] Enables the USB Host Controllers.

[Disabled] Disables the controllers.

The following items appear only when you set USB Support to [Enabled].

Legacy USB Support [Auto]

[Disabled] Disables the function.

[Enabled] Enables the support for USB devices on legacy operating systems (OS).

[Auto] Allows the system to detect the presence of USB devices at startup. If

detected, the USB controller legacy mode is enabled. If no USB device is
detected, the legacy USB support is disabled.

BIOS EHCI Hand-off [Enabled]

[Disabled] Disables the function.

[Enabled] Enables the support for operating systems without an EHCI hand-off

2-20 Chapter 2: BIOS information

feature.

2.5.5 PCIPnP

The PCIPnP menu items allow you to change the advanced settings for PCI/PnP
devices.

Advanced

Advanced PCI/PnP Settings

WARNING: Setting wrong values in below sections

may cause system to malfunction.

Plug And Play O/S [No]

BIOS SETUP UTILITY

N O : l e t s t h e B I O S

c o nf i g u r e a l l t h e

d e v i c e s i n t h e
system.

Plug And Play O/S [No]

[Yes] When set to [Yes] and if you install a Plug and Play operating system, the

[No] When set to [No], BIOS congures all the devices in the system.

operating system congures the Plug and Play devices not required for

boot.

2.5.6 Intel VT-d [Disabled]

[Disabled] Disables the Intel Virtualization Technology for Directed I/O.

[Enabled] Enables the Intel Virtualization Technology for Directed I/O.

2.6 Power menu

The Power menu items allow you to change the settings for the Advanced
Power Management (APM). Select an item then press <Enter> to display the

conguration options.

Main Ai Tweaker Advanced Power Boot Tools Exit

Suspend Mode [Auto]
Repost Video on S3 Resume [No]
ACPI 2.0 Support [Disabled]
ACPI APIC Support [Enabled]
EuP Ready [Disabled]

APM Conguration

Hardware Monitor

BIOS SETUP UTILITY

Select the ACPI state
u s e d f o r S y s t e m
Suspend.

Select Screen

←→

Select Item

↑↓

+- Change Option

F1 General Help
F10 Save and Exit
ESC Exit

v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.

2.6.1 Suspend Mode [Auto]

Allows you to select the Advanced Conguration and Power Interface (ACPI) state

to be used for system suspend.

[S1 (POS) only] Sets the APCI suspend mode to S1/POS (Power On Suspend).

[S3 only] Sets the APCI suspend mode to S3/STR (Suspend To RAM).

[Auto] The system automatically congures the ACPI suspend mode.

ASUS P7P55D LE 2-21

2.6.2 Repost Video on S3 Resume [No]

Determines whether to invoke VGA BIOS POST on S3/STR resume.

[No] The system will not invoke VGA BIOS POST on S3/STR resume.

[Yes] The system invokes VGA BIOS POST on S3/STR resume.

2.6.3 ACPI 2.0 Support [Disabled]

[Disabled] When set to [Disabled], the system will not add additional tables as per

[Enabled] When set to [Enabled], the system adds additional tables as per ACPI 2.0

ACPI 2.0 specications.

specications.

2.6.4 ACPI APIC Support [Enabled]

[Disabled] When set to [Disabled], the system disable the Advanced Conguration and

[Enabled] When set to [Enabled], the ACPI APIC table pointer is included in the RSDT

Power Interface (ACPI) support in the Advanced Programmable Interrupt
Controller (APIC).

pointer list.

2.6.5 EuP Ready [Disabled]

[Disabled] Disables the Energy Using Products (EuP) Ready function.

[Enabled] Allows BIOS to switch off some power at S5 state to get system ready for

the EuP requirement. When set to [Enabled], power for WOL, WO_USB,
audio and onboard LEDs will be switched off at S5 state.

2.6.6 APM Conguration

Power

APM Conguration

Restore on AC Power Loss [Power Off]
Power On By RTC Alarm [Disabled]
Power On By External Modems [Disalbed]
Power On By PCI Devices [Disabled]
Power On By PCIE Devices [Disabled]
Power On By PS/2 Keyboard [Disabled] PS/2 Keyboard [Disabled]
Power On By PS/2 Mouse [Disabled] PS/2 Mouse [Disabled]

BIOS SETUP UTILITY

< E n te r > t o s e l e c t
w h e th e r o r n o t t o
re s ta rt t h e s ys tem
after AC power loss.

Restore On AC Power Loss [Power Off]

[Power Off] The system goes into off state after an AC power loss.

[Power On] The system goes into on state after an AC power loss.

[Last State] The system goes into either off or on state, whatever the system state was

before the AC power loss.

Power On By RTC Alarm [Disabled]

[Disabled] Disables RTC to generate a wake event.
[Enabled] When set to [Enabled], the items RTC Alarm Date (Days) / System Time

2-22 Chapter 2: BIOS information

will become user-congurable with set values.

Power On By External Modems [Disabled]

[Disabled] Disables to power up the computer when the external modem receives a

[Enabled] The computer could be powered up when the external modem receives a

call while the computer is in Soft-off mode.

call while the computer is in Soft-off mode.

The computer cannot receive or transmit data until the computer and

applications are fully running. Thus, connection cannot be made on the rst

try. Turning an external modem off and then back on while the computer is off

causes an initialization string that turns the system power on.

Power On By PCI Devices [Disabled]

[Disabled] Disables the PME to wake up from S5 by PCI devices.

[Enabled] Allows you to turn on the system through a PCI LAN or modem card. This

feature requires an ATX power supply that provides at least 1A on the
+5VSB lead.

Power On By PCIE Devices [Disabled]

Allows you to enable or disable the PCIE devices to generate a wake event.

[Disabled] Disables the PCIE devices to generate a wake event.

[Enabled] Enables the PCIE devices to generate a wake event.

Power On By PS/2 Keyboard [Disabled]

[Disabled] Disables the Power On by a PS/2 keyboard.

[Enabled] Sets specic keys on the PS/2 keyboard to turn on the system. This feature

requires an ATX power supply that provides at least 1A on the +5VSB lead.

Power On By PS/2 Mouse [Disabled]

[Disabled] Disables the Power On by a PS/2 mouse.

[Enabled] Enables the Power On by a PS/2 mouse. This feature requires an ATX

power supply that provides at least 1A on the +5VSB lead.

ASUS P7P55D LE 2-23

2.6.7 Hardware Monitor

Power

Hardware Monitor

CPU Temperature [35ºC/95ºF]
MB Temperature [34ºC/93ºF]

CPU Fan Speed [3590RPM]
CPU Q-Fan Control [Disabled]

Chassis Fan 1 Speed [N/A]
Chassis Fan 2 Speed [N/A]
Chassis Q-Fan Control [Disabled]

Power Fan Speed [N/A]

CPU Voltage [ 1.224V]

3.3V Voltage [ 3.344V]
5V Voltage [ 5.064V]
12V Voltage [11.928V]

BIOS SETUP UTILITY

CPU Temperature(PECI)

CPU/MB Temperature [xxxºC/xxxºF]

The onboard hardware monitor automatically detects and displays the CPU and
motherboard temperatures. Select Ignored if you do not wish to display the
detected temperatures.

CPU Fan Speed [xxxxRPM] or [Ignored] / [N/A]
Chassis Fan 1/2 Speed [xxxxRPM] or [Ignored] / [N/A]
Power Fan Speed [xxxxRPM] or [Ignored] / [N/A]

The onboard hardware monitor automatically detects and displays the CPU,
chassis, and power fan speed in rotations per minute (RPM). If the fan is not
connected to the motherboard, the eld shows N/A. Select Ignored if you do not
wish to display the detected speed.

CPU Q-Fan Control [Disabled]

[Disabled] Disables the CPU Q-Fan control feature.

[Enabled] Enables the CPU Q-Fan control feature.

CPU Fan Profile [Standard]

This item appears only when you enable the CPU Q-Fan Control feature and
allows you to set the appropriate performance level of the CPU fan.

[Standard] Sets to [Standard] to make the CPU fan automatically adjust

depending on the CPU temperature.

[Silent] Sets to [Silent] to minimize the fan speed for quiet CPU fan

operation.

[Turbo] Set to [Turbo] to achieve maximum CPU fan speed.

Chassis Q-Fan Control [Disabled]

[Disabled] Disables the Chassis Q-Fan control feature.

[Enabled] Enables the Chassis Q-Fan control feature.

2-24 Chapter 2: BIOS information

Chassis Fan Profile [Standard]

This item appears only when you enable the Chassis Q-Fan Control feature
and allows you to set the appropriate performance level of the chassis fan.

[Standard] Sets to [Standard] to make the chassis fan automatically adjust

depending on the chassis temperature.

[Silent] Sets to [Silent] to minimize the fan speed for quiet chassis fan

operation.

[Turbo] Set to [Turbo] to achieve maximum chassis fan speed.

CPU Voltage, 3.3V Voltage, 5V Voltage, 12V Voltage

The onboard hardware monitor automatically detects the voltage output through
the onboard voltage regulators. Select Ignored if you do not want to detect this
item.

2.7 Boot menu

The Boot menu items allow you to change the system boot options. Select an item
then press <Enter> to display the submenu.

Main Ai Tweaker Advanced Power Boot Tools Exit

Boot Settings

Boot Device Priority

Boot Settings Conguration

Security

v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.

BIOS SETUP UTILITY

S p ec i f i e s t h e B oot
D e v i c e P r i o r i t y
sequence.

A virtual floppy disk
drive (Floppy Drive B:
) may appear when you
set th e CD-ROM dr ive
a s t h e f i r s t b o o t
device.

Sel ect S cre en

←→

S e l e c t I t e m

↑↓

Enter Go to Sub Screen
F1 G e ne ra l H el p
F10 S ave an d E xit
ESC Exit

2.7.1 Boot Device Priority

Boot

Boot Device Priority

1st Boot Device [Removable Dev.]
2nd Boot Device [Hard Drive]
3rd Boot Device [ATAPI DVD-ROM]

BIOS SETUP UTILITY

Sp e ci fi e s t he b o ot
s e q ue n c e f r o m t h e
available devices.

1st ~ xxth Boot Device [Removable Dev.]

These items specify the boot device priority sequence from the available devices.
The number of device items that appears on the screen depends on the number of
devices installed in the system.

Conguration options: [Removable Dev.] [Hard Drive] [ATAPI CD-ROM] [Disabled]

ASUS P7P55D LE 2-25

2.7.2 Boot Settings Conguration

Quick Boot [Enabled]

[Disabled] When set to [Disabled], BIOS performs all the POST items.

[Enabled] When set to [Enabled], BIOS skips some power on self tests (POST) while

booting to decrease the time needed to boot the system.

Full Screen Logo [Enabled]

[Disabled] Disables the full screen logo display feature.

[Enabled] Enables the full screen logo display feature.

Set this item to [Enabled] to use the ASUS MyLogo 2™ feature.

AddOn ROM Display Mode [Force BIOS]

[Force BIOS] The third-party ROM messages will be forced to display during the boot

[Keep Current] The third-party ROM messages will be displayed only if the third-party

sequence.

manufacturer had set the add-on device to do so.

Bootup Num-Lock [On]

[Off] Sets the power-on state of the NumLock to [Off].

[On] Sets the power-on state of the NumLock to [On].

Wait For ‘F1’ If Error [Enabled]

[Disabled] Disables this function.

[Enabled] The system waits for the <F1> key to be pressed when error occurs.

Hit ‘DEL’ Message Display [Enabled]

[Disabled] Disables this function.

[Enabled] The system displays the message “Press DEL to run Setup” during POST.

2.7.3 Security

The Security menu items allow you to change the system security settings. Select

an item then press <Enter> to display the conguration options.

Change Supervisor Password

Select this item to set or change the supervisor password. The Supervisor
Password item on top of the screen shows the default Not Installed. After you set

a password, this item shows Installed.

To set a Supervisor Password:

1. Select the Change Supervisor Password item and press <Enter>.

2. From the password box, type a password composed of at least six letters and/or
numbers, then press <Enter>.

3. Conrm the password when prompted.

2-26 Chapter 2: BIOS information

The message Password Installed appears after you successfully set your
password.

To change the supervisor password, follow the same steps as in setting a user
password.

To clear the supervisor password, select the Change Supervisor Password then
press <Enter>. The message Password Uninstalled appears.

If you forget your BIOS password, you can clear it by erasing the CMOS Real
Time Clock (RTC) RAM. See section Rear panel connectors for information on
how to erase the RTC RAM.

After you have set a supervisor password, the other items appear to allow you to
change other security settings.

User Access Level [Full Access]

This item allows you to select the access restriction to the Setup items.

[No Access] Prevents user access to the Setup utility.

[View Only] Allows access but does not allow change to any eld.

[Limited] Allows changes only to selected elds, such as Date and Time.

[Full Access] Allows viewing and changing all the elds in the Setup utility.

Change User Password

Select this item to set or change the user password. The User Password item on
top of the screen shows the default Not Installed. After you set a password, this
item shows Installed.

To set a User Password:

1. Select the Change User Password item and press <Enter>.

2. On the password box that appears, type a password composed of at least six letters
and/or numbers, then press <Enter>.

3. Conrm the password when prompted.

The message Password Installed appears after you set your password
successfully.

To change the user password, follow the same steps as in setting a user password.

Clear User Password

Select this item to clear the user password.

Password Check [Setup]

[Setup] BIOS checks for user password when accessing the Setup utility.

[Always] BIOS checks for user password both when accessing Setup and booting

ASUS P7P55D LE 2-27

the system.

2.8 Tools menu

The Tools menu items allow you to congure options for special functions. Select

an item then press <Enter> to display the submenu.

2.8.1 ASUS O.C. Prole

This item allows you to store or load multiple BIOS settings.

Add Your CMOS Prole

Allows you to save the current BIOS le to the BIOS Flash. In the Name sub-item,
type your prole name and press <Enter>, and then choose a prole number to

save your CMOS settings in the Save to sub-item.

Load CMOS Proles

Allows you to load the previous BIOS settings saved in the BIOS Flash. Press

<Enter>, and choose a prole to load.

Start O.C. Prole

Allows you to run the utility to save and load CMOS. Press <Enter> to run the
utility.

ASUSTek O.C. Prole Utility V2.00b

Current CMOS

BOARD: P7P55D LE
VER: 0166
DATE: 07/08/2009

PATH: A:\

A:

Note

[Enter] Select or Load [Tab] Switch [V] Drive Info
[Up/Down/Home/End] Move [B] Backup [Esc] Exit

Restore CMOS

BOARD:Unknown
VER: Unknown
DATE: Unknown

• This function can support devices such as a USB ash disk with FAT 32/16

format and single partition only.

• DO NOT shut down or reset the system while updating the BIOS to prevent
the system boot failure!

• We recommend that you update the BIOS le only coming from the same
memory/CPU conguration and BIOS version.

• Only the CMO le can be loaded.

2-28 Chapter 2: BIOS information

2.8.2 AI NET 2

Tools

AI NET 2

Pair Status Length

Check Realtek LAN cable [Disabled]

BIOS SETUP UTILITY

Check Realtek LAN

cable during POST.

It will take 3 to 10

seconds to diagnose

LAN cable.

Check Realtek LAN Cable [Disabled]

[Disabled] BIOS will not check the Realtek LAN cable during the Power-On Self-Test

[Enabled] BIOS checks the Realtek LAN cable during the Power-On Self-Test

(POST).

(POST).

2.8.3 Express Gate [Auto]

Allows you to enable or disable the ASUS Express Gate feature. The ASUS
Express Gate feature is a unique instant-on environment that provides quick

access to the Internet browser and Skype. Conguration options: [Disabled]

[Enabled] [Auto]

Enter OS Timer [10 Seconds]

Sets countdown duration that the system waits at the Express Gate’s rst

screen before starting Windows or other installed OS. Choose [Prompt User]

to stay at the rst screen of Express Gate for user action.
Conguration options: [Prompt User] [1 second] [3 seconds] [5 seconds] [10

seconds] [15 seconds] [20 seconds] [30 seconds]

Reset User Data [No]

Allows you to clear Express Gate’s user data.

[Reset] When setting this item to [Reset], ensure that you save the setting

to the BIOS so that the user data will be cleared the next time you
enter the Express Gate. User data includes the Express Gate’s
settings as well as any personal information stored by the web
browser such as bookmarks, cookies, browsing history. This is
useful in the rare case where corrupt settings prevent the Express
Gate environment from launching properly.

[No] Set to [No] to disable the Reset User Data function when entering

the Express Gate.

The rst time wizard will run again when you enter the Express Gate

environment after clearing its settings.

ASUS P7P55D LE 2-29

2.9 Exit menu

The Exit menu items allow you to load the optimal or failsafe default values for the
BIOS items, and save or discard your changes to the BIOS items.

Main Ai Tweaker Advanced Power Boot Tools Exit

Exit Options

Exit & Save Changes
Exit & Discard Changes
Discard Changes

Load Setup Defaults

v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.

Pressing <Esc> does not immediately exit this menu. Select one of the options
from this menu or <F10> from the legend bar to exit.

Exit & Save Changes

Once you are nished making your selections, choose this option from the Exit

menu to ensure the values you selected are saved to the CMOS RAM. An onboard
backup battery sustains the CMOS RAM so it stays on even when the PC is turned
off. When you select this option, a conrmation window appears. Select Ok to save
changes and exit.

BIOS SETUP UTILITY

Exit system setup

after saving the
changes.

F10 key can be used
for this operation.

Sel ect S cre en

←→

S e l e c t I t e m

↑↓

Enter Go to Sub Screen
F1 G e ne ra l H el p
F10 S ave an d E xit
ESC Exit

If you attempt to exit the Setup program without saving your changes, the
program prompts you with a message asking if you want to save your changes
before exiting. Press <Enter> to save the changes while exiting.

Exit & Discard Changes

Select this option only if you do not want to save the changes that you made to

the Setup program. If you made changes to elds other than System Date, System
Time, and Password, the BIOS asks for a conrmation before exiting.

Discard Changes

This option allows you to discard the selections you made and restore the

previously saved values. After selecting this option, a conrmation appears. Select

Ok to discard any changes and load the previously saved values.

Load Setup Defaults

This option allows you to load the default values for each of the parameters on the

Setup menus. When you select this option or if you press <F5>, a conrmation

window appears. Select Ok to load default values. Select Exit & Save Changes or
make other changes before saving the values to the non-volatile RAM.

2-30 Chapter 2: BIOS information