Asus P7P55D PRO User manual

Motherboard
P7P55D
PRO

ii
E4988
Second Edition (V2)
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.

iii
Contents
Contents...................................................................................................................... iii
Notices ..................................................................................................................... viii
Safety information...................................................................................................... ix
About this guide.......................................................................................................... x
P7P55D PRO specications summary .................................................................... xii
Chapter 1: Product introduction
1.1 Welcome! .................................................................................................... 1-1
1.2 Package contents....................................................................................... 1-1
1.3 Special features.......................................................................................... 1-2
1.3.1 Product highlights........................................................................ 1-2
1.3.2 ASUS Xtreme Design—Hybrid Processor .................................. 1-3
1.3.3 ASUS Xtreme Design—Hybrid Phase ........................................ 1-3
1.3.4 ASUS Xtreme Design—Hybrid OS ............................................. 1-3
1.3.5 ASUS Exclusive Features........................................................... 1-3
Chapter 2: Hardware information
2.1 Before you proceed ................................................................................... 2-1
2.2 Motherboard overview............................................................................... 2-2
2.2.1 Motherboard layout ..................................................................... 2-2
2.2.2 Layout contents........................................................................... 2-3
2.2.3 Placement direction..................................................................... 2-4
2.2.4 Screw holes................................................................................. 2-4
2.3 Central Processing Unit (CPU) ................................................................. 2-5
2.3.1 Installing the CPU ....................................................................... 2-5
2.3.2 Installing the CPU heatsink and fan............................................ 2-8
2.3.3 Uninstalling the CPU heatsink and fan........................................ 2-9
2.4 System memory ....................................................................................... 2-10
2.4.1 Overview ................................................................................... 2-10
2.4.2 Memory congurations.............................................................. 2-11
2.4.3 Installing a DIMM ...................................................................... 2-19
2.4.4 Removing a DIMM .................................................................... 2-19
2.5 Expansion slots........................................................................................ 2-20
2.5.1 Installing an expansion card...................................................... 2-20
2.5.2 Conguring an expansion card ................................................. 2-20
2.5.3 Interrupt assignments................................................................ 2-21
2.5.4 PCI slots.................................................................................... 2-22
2.5.5 PCI Express 2.0 x1 slots (2.5GT/s)........................................... 2-22
2.5.6 PCI Express 2.0 x16 slots......................................................... 2-22

iv
Contents
2.6 Jumpers .................................................................................................... 2-24
2.7 Onboard switches .................................................................................... 2-25
2.8 Connectors ............................................................................................... 2-27
2.8.1 Rear panel connectors.............................................................. 2-27
2.8.2 Audio I/O connections............................................................... 2-28
2.8.3 Internal connectors.................................................................... 2-31
2.8.4. ASUS Q-Connector (system panel) .......................................... 2-40
2.9 Onboard LEDs .......................................................................................... 2-41
2.10 Starting up for the rst time.................................................................... 2-42
2.11 Turning off the computer......................................................................... 2-42
Chapter 3: BIOS setup
3.1 Knowing BIOS ............................................................................................ 3-1
3.2 Updating BIOS............................................................................................ 3-1
3.2.1 ASUS Update utility..................................................................... 3-2
3.2.2 ASUS EZ Flash 2 utility............................................................... 3-4
3.2.3 ASUS CrashFree BIOS 3 utility................................................... 3-5
3.2.4 ASUS BIOS Updater................................................................... 3-5
3.3 BIOS setup program .................................................................................. 3-8
3.3.1 BIOS menu screen...................................................................... 3-8
3.3.2 Menu bar ..................................................................................... 3-8
3.3.3 Navigation keys........................................................................... 3-9
3.3.4 Menu items.................................................................................. 3-9
3.3.5 Submenu items ........................................................................... 3-9
3.3.6 Conguration elds ..................................................................... 3-9
3.3.7 Pop-up window............................................................................ 3-9
3.3.8 Scroll bar ..................................................................................... 3-9
3.3.9 General help................................................................................ 3-9
3.4 Main menu ................................................................................................3-10
3.4.1 SATA 1-6 ................................................................................... 3-10
3.4.2 Storage Conguration ............................................................... 3-12
3.4.3 AHCI Conguration ................................................................... 3-13
3.4.4 System Information ................................................................... 3-13
3.5 Ai Tweaker menu...................................................................................... 3-14
3.5.1 Ai Overclock Tuner [Auto] ......................................................... 3-14
3.5.2 CPU Ratio Setting [Auto]........................................................... 3-15
3.5.3 Intel(R) SpeedStep(TM) Tech [Enabled] ................................... 3-15
3.5.4 DRAM Frequency [Auto] ........................................................... 3-16

v
3.5.5 QPI Frequency [Auto]................................................................3-16
3.5.6 DRAM Timing Control ............................................................... 3-16
3.5.7 Intel(R) TurboMode Tech [Enabled] .......................................... 3-16
3.5.8 Xtreme Phase Full Power Mode [Auto]..................................... 3-16
3.5.9 BCLK Frequency [XXX]............................................................. 3-16
3.5.10 PCIE Frequency [XXX].............................................................. 3-16
3.5.11 CPU Differential Amplitude [Auto] ............................................. 3-18
3.5.12 CPU Clock Skew [Auto] ............................................................ 3-18
3.5.13 CPU Voltage Mode [Offset] ...................................................... 3-19
3.5.14 IMC Voltage [Auto] ................................................................... 3-19
3.5.15 DRAM Voltage [Auto] ................................................................ 3-19
3.5.16 CPU PLL Voltage [Auto]............................................................ 3-19
3.5.17 PCH Voltage [Auto] ................................................................... 3-20
3.5.18 DRAM DATA REF Voltage on CHA/B [Auto] ............................. 3-20
3.5.19 Load-Line Calibration [Auto]...................................................... 3-20
3.5.20 CPU Spread Spectrum [Auto] ................................................... 3-20
3.5.21 PCIE Spread Spectrum [Auto] .................................................. 3-20
3.6 Advanced menu ....................................................................................... 3-21
3.6.1 CPU Conguration .................................................................... 3-21
3.6.2 North Bridge Conguration........................................................ 3-23
3.6.3 Onboard Devices Conguration................................................ 3-24
3.6.4 USB Conguration .................................................................... 3-25
3.6.5 PCIPnP ..................................................................................... 3-26
3.6.6 Intel VT-d [Disabled].................................................................. 3-26
3.6.7 T.Probe [Enabled]...................................................................... 3-26
3.7 Power menu.............................................................................................. 3-27
3.7.1 Suspend Mode [Auto]................................................................ 3-27
3.7.2 Repost Video on S3 Resume [No] ............................................ 3-27
3.7.3 ACPI 2.0 Support [Disabled] ..................................................... 3-27
3.7.4 ACPI APIC Support [Enabled]................................................... 3-27
3.7.5 EuP Ready [Disabled] ............................................................... 3-27
3.7.6 APM Conguration.................................................................... 3-28
3.7.7 Hardware Monitor...................................................................... 3-29
3.8 Boot menu ................................................................................................3-30
3.8.1 Boot Device Priority................................................................... 3-30
3.8.2 Boot Settings Conguration ...................................................... 3-31
3.8.3 Security ..................................................................................... 3-32
Contents

vi
3.9 Tools menu ............................................................................................... 3-34
3.9.1 ASUS O.C. Prole..................................................................... 3-34
3.9.2 AI NET 2.................................................................................... 3-35
3.9.3 ASUS EZ Flash 2...................................................................... 3-36
3.9.4 Express Gate [Auto].................................................................. 3-36
3.10 Exit menu..................................................................................................3-37
Chapter 4: Software support
4.1 Installing an operating system ................................................................. 4-1
4.2 Support DVD information.......................................................................... 4-1
4.2.1 Running the support DVD ........................................................... 4-1
4.2.2 Obtaining the software manuals.................................................. 4-2
4.3 Software information ................................................................................. 4-3
4.3.1 ASUS PC Probe II....................................................................... 4-3
4.3.2 ASUS AI Suite ............................................................................. 4-4
4.3.3 ASUS Fan Xpert.......................................................................... 4-5
4.3.4 ASUS EPU .................................................................................. 4-6
4.3.5 ASUS Express Gate.................................................................... 4-7
4.3.6 VIA® High Denition Audio utility ................................................. 4-8
4.3.7 ASUS T.Probe ............................................................................. 4-9
4.4 ASUS Unique Overclocking Utility—TurboV EVO................................. 4-10
4.4.1 Using ASUS TurboV.................................................................. 4-10
4.4.2 Using ASUS TurboV Auto Tuning Mode.................................... 4-11
4.4.3 Using ASUS Turbo Key ............................................................. 4-12
4.5 RAID congurations ................................................................................ 4-13
4.5.1 RAID denitions ........................................................................ 4-13
4.5.2 Installing Serial ATA hard disks ................................................. 4-14
4.5.3 Setting the RAID item in BIOS .................................................. 4-14
4.5.4 Intel®Matrix Storage Manager option ROM utility..................... 4-14
4.6 Creating a RAID driver disk..................................................................... 4-18
4.6.1 Creating a RAID driver disk without entering the OS................ 4-18
4.6.2 Creating a RAID driver disk in Windows®.................................. 4-18
4.6.3 Installing the RAID driver during Windows®OS installation ...... 4-18
4.6.4 Using a USB oppy disk drive................................................... 4-19
Contents

vii
Chapter 5: Multiple GPU technology support
5.1 ATI®CrossFireX™ technology .................................................................. 5-1
5.1.1 Requirements.............................................................................. 5-1
5.1.2 Before you begin......................................................................... 5-1
5.1.3 Installing two CrossFireX™ graphics cards ................................ 5-2
5.1.4 Installing three CrossFireX™ graphics cards.............................. 5-3
5.1.5 Installing the device drivers......................................................... 5-4
5.1.6 Enabling the ATI®CrossFireX™ technology ............................... 5-4
5.2 NVIDIA®SLI™ technology ......................................................................... 5-6
5.2.1 Requirements.............................................................................. 5-6
5.2.2 Installing two SLI-ready graphics cards ...................................... 5-6
5.2.3 Installing the device drivers......................................................... 5-7
5.2.4 Enabling the NVIDIA®SLI™ technology ..................................... 5-7
Contents

viii
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.
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.
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.
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.

ix
Safety information
Electrical safety
• To prevent electrical shock hazard, disconnect the power cable from the electrical outlet
before relocating the system.
• When adding or removing devices to or from the system, ensure that the power cables
for the devices are unplugged before the signal cables are connected. If possible,
disconnect all power cables from the existing system before you add a device.
• Before connecting or removing signal cables from the motherboard, ensure that all
power cables are unplugged.
• Seek professional assistance before using an adapter or extension cord. These devices
could interrupt the grounding circuit.
• Ensure that your power supply is set to the correct voltage in your area. If you are not sure
about the voltage of the electrical outlet you are using, contact your local power company.
• If the power supply is broken, do not try to x it by yourself. Contact a 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.
Operation safety
• Before installing the motherboard and adding devices on it, carefully read all the manuals
that came with the package.
• Before using the product, ensure all cables are correctly connected and the power
cables are not damaged. If you detect any damage, contact your dealer immediately.
• To avoid short circuits, keep paper clips, screws, and staples away from connectors,
slots, sockets and circuitry.
• Avoid dust, humidity, and temperature extremes. Do not place the product in any area
where it may become wet.
This motherboard should only be used in environments with ambient temperatures between
5°C (41°F) and 40°C (104°F).
• Place the product on a stable surface.
• If you encounter technical problems with the product, contact a qualied service
technician or your retailer.
• 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.

x
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: Hardware information
This chapter lists the hardware setup procedures that you have to perform when
installing system components. It includes description of the switches, jumpers, and
connectors on the motherboard.
• Chapter 3: BIOS setup
This chapter tells how to change system settings through the BIOS Setup menus.
Detailed descriptions of the BIOS parameters are also provided.
• Chapter 4: Software support
This chapter describes the contents of the support DVD that comes with the
motherboard package and the software.
• Chapter 5: Multiple GPU technology support
This chapter describes how to install and congure multiple ATI®CrossFireX™ and
NVIDIA®SLI™ graphics cards.
Where to nd more information
Refer to the following sources for additional information and for product and software updates.
1. ASUS websites
The ASUS website provides updated information on ASUS hardware and software
products. Refer to the ASUS contact information.
2. Optional documentation
Your product package may include optional documentation, such as warranty yers,
that may have been added by your dealer. These documents are not part of the
standard package.

xi
Conventions used in this guide
To ensure that you perform certain tasks properly, take note of the following symbols used
throughout this manual.
Typography
Bold text Indicates a menu or an item to select.
Italic s 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> + <Del>
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.

xii
P7P55D PRO specications summary
(continued on the next page)
CPU LGA1156 socket for Intel®Core™ i7 / Core™ i5 Processors
Supports Intel®Turbo Boost Technology
* Refer to www.asus.com for Intel CPU support list
Chipset Intel®P55 Express Chipset
Memory 4 x DIMM, max. 16GB, DDR3 2133(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)
Expansion slots 2 x PCI Express 2.0 x16 slots (single at x16 or dual at x8 / x8 mode)
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)
2 x PCI slots
Multi-GPU support Supports NVIDIA®Quad-GPU SLI™ Technology
Supports ATI®Quad-GPU CrossFireX™ Technology
Storage Intel®P55 Express Chipset
- 6 x SATA 3.0 Gb/s ports
- Intel®Matrix Storage Technology supports SATA RAID 0, 1,
5, and 10
JMicron®JMB363 SATA & PATA controller
- 1 x Ultra DMA 133/100/66 for up to 2 PATA devices
- 1 x External SATA 3.0 Gb/s port (SATA On-the-Go)
- 1 x SATA 3.0 Gb/s port
LAN Realtek®8112L Gigabit LAN controller featuring AI NET2
USB 14 x USB 2.0 ports (6 ports at mid-board, 8 ports at back panel)
IEEE 1394 VIA® VT6308P controller supports 2 x IEEE 1394a ports
(one at midboard; one at back panel)
Audio VIA® VT1828S 8-channel High Denition Audio CODEC
- Absolute Pitch BD192/24
- DTS Surround Sensation UltraPC
- Supports Jack-Detection, Multi-streaming, and
Front Panel Jack-Retasking
- Coaxial / Optical S/PDIF out ports at back I/O

xiii
(continued on the next page)
P7P55D PRO specications summary
ASUS unique features ASUS Hybrid Processor – TurboV EVO
- Auto Tuning, TurboV and Turbo Key
ASUS Hybrid Phase
- T.Probe Technology for Active Cooling
- 12+2 Phase Power Design
ASUS Hybrid OS – Express Gate
ASUS Xtreme Design
ASUS Exclusive Features:
- MemOK!
- ASUS EPU
ASUS Quiet Thermal Solutions
- 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-Shield
- ASUS Q-Connector
- ASUS O.C. Prole
- ASUS CrashFree BIOS 3
- ASUS EZ Flash 2
- ASUS MyLogo 2™
- Multi-language BIOS
ASUS Q-Design ASUS Q-LED (CPU, DRAM, VGA, Boot Device LED)
ASUS Q-Slot
ASUS Q-DIMM
ASUS exclusive
overclocking features
Precision Tweaker 2
- vCore: Adjustable CPU voltage at 0.00625V increment
- vIMC: Adjustable IMC voltage at 0.00625V increment
- vDRAM Bus: 81-step DRAM bus voltage control
- vPCH: 2-step chipset voltage control
- vCPU_PLL: 4-step reference voltage control
SFS (Stepless Frequency Selection)
- Internal Base Clock tuning from 80MHz 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)

xiv
*Specications are subject to change without notice.
P7P55D PRO specications summary
Back panel I/O ports 1 x PS/2 keyboard port (purple)
1 x PS/2 mouse port (green)
1 x Coaxial S/PDIF Out port
1 x Optical S/PDIF Out port
1 x IEEE 1394a port
1 x External SATA port
1 x LAN (RJ-45) port
8 x USB 2.0/1.1 ports
8-channel Audio I/O ports
Internal I/O connectors 3 x USB connectors support additional 6 USB ports
1 x IDE connector
7 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 IEEE1394a connector
1 x COM connector
Front panel audio connector
1 x S/PDIF Out header
CD audio in
24-pin ATX Power connector
8-pin EATX 12V Power connector
System Panel (Q-Connector)
1 x MemOK! button
BIOS features 16 Mb Flash ROM, AMI BIOS, PnP, DMI 2.0, WfM 2.0,
SM BIOS 2.5, ACPI 2.0a, Multi-language BIOS,
ASUS EZ Flash 2, ASUS CrashFree BIOS 3
Manageability WfM 2.0, DMI 2.0, WOL by PME, WOR by PME, PXE
Support DVD contents Drivers
ASUS Utilities
ASUS Update
Anti-virus software (OEM version)
Form factor ATX form factor: 12 in. x 9.6 in. (30.5 cm x 24.4 cm)

ASUS P7P55D PRO 1-1
Chapter 1
1.1 Welcome!
Thank you for buying an ASUS®P7P55D PRO motherboard!
The motherboard delivers a host of new features and latest technologies, making it another
standout in the long line of ASUS quality motherboards!
Before you start installing the motherboard, and hardware devices on it, check the items in
your package with the list below.
Chapter 1: Product introduction
Chapter 1
1.2 Package contents
Check your motherboard package for the following items.
• If any of the above items is damaged or missing, contact your retailer.
• The illustrated items above are for reference only. Actual product specications may
vary with different models.
ASUS P7P55D PRO motherboard 1 x Ultra DMA 133/100/66 cable
1 x 2-port USB 2.0 and 1-port
eSATA module 4 x Serial ATA 3.0 Gb/s cables
1 x 2-in-1 ASUS Q-Connector kit 1 x ASUS Q-Shield
User Manual
User guide Support DVD

1-2 Chapter 1: Product Introduction
Chapter 1
1.3 Special features
1.3.1 Product highlights
Intel® LGA1156 Lynneld Processor Ready
This motherboard supports the latest Intel® Lynneld processors in LGA1156 package, which
has memory and PCI Express controller integrated to support 2-channel (4 DIMMs) DDR3
memory and 16 PCI Express 2.0 lanes, providing great graphics performance. Intel® Lynneld
processor is one of the most powerful and energy efcient CPU in the world. Refer to page
2-5 for details.
Intel®P55
The Intel®P55 Express Chipset is the latest one-chipset design to support the latest 1156
socket Intel®Core™ i7 / Core™ i5 processors. Intel®P55 provides improved performance by
utilizing serial point-to-point links, allowing increased bandwidth and stability.
Quad-GPU SLI™ and Quad-GPU CrossFireX™ support!
P7P55D PRO brings you the multi-GPU choice of either SLI™ or CrossFireX™. The
motherboard features the most powerful Intel® P55 platform to optimize PCIe allocation in
multiple GPU congurations. Expect a brand-new gaming style you’ve never experienced
before! Refer to Chapter 5 for details.
Dual-Channel DDR3 2133(O.C.) / 1600 / 1333 / 1066 support
The motherboard supports DDR3 memory that features data transfer rates of 2133(O.C.) /
1600 / 1333 / 1066 MHz to meet the higher bandwidth requirements of the latest 3D graphics,
multimedia, and Internet applications. The dual-channel DDR3 architecture enlarges the
bandwidth of your system memory to boost system performance. Refer to page 2-10 for
details.
Green ASUS
This motherboard and its packaging comply with the European Union’s Restriction on the
use of Hazardous Substances (RoHS). This is in line with the ASUS vision of creating
environment-friendly and recyclable products/packaging to safeguard consumers’ health
while minimizing the impact on the environment.

ASUS P7P55D PRO 1-3
Chapter 1
1.3.2 ASUS Xtreme Design—Hybrid Processor
TurboV EVO
The ultimate O.C. processor satises every level of overclockers—from die-hard enthusiasts
to beginners. Auto tuning intelligently pushes the system to the fastest clock speeds while
maintaining stability. Turbo Key boosts performance with just one touch; while TurboV offers
more options to advanced overclockers to achieve world O.C. record. Refer to page 4-10 for
details.
Auto Tuning
Auto Tuning is an intelligent tool that automates overclocking to achieve a total system level
up. This tool also provides stability testing. Even O.C. beginners can achieve extreme yet
stable overclocking results with Auto Tuning! Refer to page 4-11 for details.
1.3.3 ASUS Xtreme Design—Hybrid Phase
T.Probe
The T.Probe microchip detects and balances power phase loading and temperature in real-
time. This feature optimizes the power phase functions, allowing components to run at lower
temperatures and extending their lifespan.
ASUS 12+2 Phase Power Design
The groundbreaking 12+2 phase VRM design is brought to the ASUS motherboards. 12+2
phase power design, 12-phase for vCore and extra 2-phase for Memory controller inside
CPU can provide the highest power efciency, and hence generates less heat to effectively
enhance the overclocking capability. With the high quality power components such as low
RDS (on) MOSFETs, Ferrite core chokes with lower hysteresis loss and 100% Japan-made
high quality conductive polymer capacitors, ASUS 12+2 phase VRM design also ensure
longer component life and minimum power loss.
1.3.4 ASUS Xtreme Design—Hybrid OS
Express Gate
Express Gate is an ASUS exclusive OS that provides you with quick access to the Internet and
key applications before entering the Windows®OS. Refer to page 3-36 and 4-7 for details.
1.3.5 ASUS Exclusive Features
MemOK!
Memory compatibility is among the top concerns during computer upgrades. Worry no more.
MemOK! is the fastest memory booting solution today. This remarkable memory rescue tool
requires nothing but a push of a button to patch memory issues and get your system up and
running in no time. The technology is able to determine failsafe settings that can dramatically
improve your system booting success. Refer to page 2-25 for details.

1-4 Chapter 1: Product Introduction
Chapter 1
ASUS EPU
The ASUS EPU (Energy Processing Unit) provides total system power management by
detecting current PC loadings and intelligently moderating power usage for critical PC
components in real-time–helping save power and money! Refer to page 4-6 for details.
ASUS Quiet Thermal Solution
ASUS Quiet Thermal solution makes system more stable and enhances the overclocking
capability.
Fan Xpert
ASUS Fan Xpert intelligently allows you to adjust both the CPU and chassis fan speeds
according to different ambient temperatures caused by different climate conditions
in different geographic regions and your PC’s loading. The built-in variety of useful
proles offer exible controls of fan speed to achieve a quiet and cool environment.
Refer to page 4-5 for details.
DTS Surround Sensation UltraPC
DTS Surround Sensation UltraPC delivers exceptional 5.1 surround experience through the
most common PC audio setups—your existing stereo speakers or headphones. In addition
to virtual surround, “Bass enhancement” provides stronger low frequency bass sound, and
“Voice clarication” provides clear human dialogue even with loud background sound. With
these technologies, you may experience a better home-theater audio with ease.
ASUS EZ DIY
ASUS EZ DIY feature collection provides you easy ways to install computer components,
update the BIOS or back up your favorite settings.
ASUS Q-Design
ASUS Q-Design enhances your DIY experience. All of Q-LED, Q-Slot and Q-DIMM
design speed up and simplify the DIY process!
ASUS Q-Shield
ASUS Q-Shield’s special design makes it convenient and easy to install on your
motherboard. With better electric conductivity, it ideally protects your motherboard
against static electricity and shields it against Electronic Magnetic Interference (EMI).
ASUS Q-Connector
ASUS Q-Connector allows you to easily connect or disconnect the chassis front panel
cables to the motherboard. This unique module eliminates the trouble of connecting
the system panel cables one at a time and avoiding wrong cable connections. Refer to
page 2-40 for details.
ASUS EZ-Flash 2
ASUS EZ Flash 2 is a user-friendly utility that allows you to update the BIOS without
using a bootable oppy disk or an OS-based utility. Refer to page 3-4 for details.

ASUS P7P55D PRO 2-1
Chapter 2
2.1 Before you proceed
Take note of the following precautions before you install motherboard components or change
any motherboard settings.
• Unplug the power cord from the wall socket before touching any component.
• Before handling components, use a grounded wrist strap or touch a safely grounded
object or a metal object, such as the power supply case, to avoid damaging them due
to static electricity.
• Hold components by the edges to avoid touching the ICs on them.
• Whenever you uninstall any component, place it on a grounded antistatic pad or in the
bag that came with the component.
• Before you install or remove any component, ensure that the ATX power supply is
switched off or the power cord is detached from the power supply. Failure to do so
may cause severe damage to the motherboard, peripherals, or components.
Chapter 2: Hardware information
Chapter 2
Onboard LED
The motherboard comes with a standby power LED. The green LED lights up to indicate
that the system is ON, in sleep mode, or in soft-off mode. This is a reminder that you should
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.

2-2 Chapter 2: Hardware information
Chapter 2
2.2.1 Motherboard layout
Refer to 2.8 Connectors for more information about rear panel connectors and internal
connectors.
2.2 Motherboard overview