Intel DX48BT2 - Desktop Board Extreme Series... User manual

Intel®Desktop Board DX48BT2
Product Guide
Order Number: E27416-001

Revision History
Revision Revision History Date
-001 First release of the Intel®Desktop Board DX48BT2 Product Guide November 2007
If an FCC declaration of conformity marking is present on the board, the following statement applies:
FCC Declaration of Conformity
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
For questions related to the EMC performance of this product, contact:
Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124
1-800-628-8686
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 the 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 the receiver.
•Connect the equipment to an outlet on a circuit other than the one to which the receiver is connected.
•Consult the dealer or an experienced radio/TV technician for help.
Any changes or modifications to the equipment not expressly approved by Intel Corporation could void the
user’s authority to operate the equipment.
Tested to comply with FCC standards for home or office use.
Canadian Department of Communications Compliance 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.
Le présent appareil numerique német pas de bruits radioélectriques dépassant les limites applicables aux
appareils numériques de la classe B prescrites dans le Réglement sur le broullage radioélectrique édicté par
le ministére des Communications du Canada.
Disclaimer
INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL®PRODUCTS. NO LICENSE,
EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS
GRANTED BY THIS DOCUMENT. EXCEPT AS PROVIDED IN INTEL’S TERMS AND CONDITIONS OF SALE FOR
SUCH PRODUCTS, INTEL ASSUMES NO LIABILITY WHATSOEVER, AND INTEL DISCLAIMS ANY EXPRESS OR
IMPLIED WARRANTY, RELATING TO SALE AND/OR USE OF INTEL PRODUCTS INCLUDING LIABILITY OR
WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT
OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. Intel products are not intended
for use in medical, life saving, or life sustaining applications. Intel may make changes to specifications and
product descriptions at any time, without notice.
Desktop Board DX48BT2 may contain design defects or errors known as errata which may cause the product
to deviate from published specifications. Current characterized errata are available on request.
Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing
your product order.
Copies of documents which have an ordering number and are referenced in this document, or other Intel
literature, may be obtained from Intel Corporation by going to the World Wide Web site at:
http://www.intel.com/ or by calling 1-800-548-4725.
Intel and Pentium are trademarks of Intel Corporation in the United States and other countries.
* Other names and brands may be claimed as the property of others.
Copyright © 2007, Intel Corporation. All rights reserved.

iii
Preface
This Product Guide gives information about board layout, component installation, BIOS
update, and regulatory requirements for Intel®Desktop Board DX48BT2.
Intended Audience
The Product Guide is intended for technically qualified personnel. It is not intended for
general audiences.
Use Only for Intended Applications
All Intel Desktop Boards are evaluated as Information Technology Equipment (I.T.E.)
for use in personal computers (PC) for installation in homes, offices, schools, computer
rooms, and similar locations. The suitability of this product for other PC or embedded
non-PC applications or other environments, such as medical, industrial, alarm systems,
test equipment, etc. may not be supported without further evaluation by Intel.
Document Organization
The chapters in this Product Guide are arranged as follows:
1 Desktop Board Features: a summary of product features
2 Installing and Replacing Desktop Board Components: instructions on how to install
the Desktop Board and other hardware components
3 Updating the BIOS: instructions on how to update the BIOS
4 Configuring for RAID: information about configuring your system for RAID
A Error Messages and Indicators: information about BIOS error messages and beep
codes
B Regulatory Compliance: describes the board’s adherence to safety standards and
EMC regulations and its product certifications
Conventions
The following conventions are used in this manual:
CAUTION
Cautions warn the user about how to prevent damage to hardware or loss of data.
NOTE
Notes call attention to important information.

Intel Desktop Board DX48BT2 Product Guide
iv
Terminology
The table below gives descriptions of some common terms used in the product guide.
Term Description
GB Gigabyte (1,073,741,824 bytes)
GHz Gigahertz (one billion hertz)
KB Kilobyte (1024 bytes)
MB Megabyte (1,048,576 bytes)
Mb Megabit (1,048,576 bits)
MHz Megahertz (one million hertz)

v
Contents
1Desktop Board Features
Supported Operating Systems..............................................................................10
Desktop Board Components.................................................................................11
Processor..........................................................................................................13
Main Memory.....................................................................................................14
Intel®X48 Express Chipset..................................................................................15
Audio Subsystem ...............................................................................................15
LAN Subsystem .................................................................................................16
USB 2.0 Support................................................................................................17
Enhanced IDE Interface ......................................................................................17
Serial ATA.........................................................................................................17
Legacy I/O........................................................................................................17
Expandability.....................................................................................................18
BIOS................................................................................................................18
Serial ATA and IDE Auto Configuration...........................................................18
PCI and PCI Express* Auto Configuration .......................................................18
Security Passwords.....................................................................................18
Hardware Management .......................................................................................19
Hardware Monitoring and Fan Speed Control ..................................................19
Intel®Precision Cooling Technology .......................................................19
Chassis Intrusion........................................................................................19
Power Management............................................................................................20
Software Support .......................................................................................20
ACPI..................................................................................................20
Hardware Support ......................................................................................20
Power Connectors ...............................................................................20
Fan Headers .......................................................................................21
LAN Wake Capabilities..........................................................................21
Instantly Available PC Technology..........................................................21
+5 V Standby Power Indicator...............................................................22
Wake from USB ..................................................................................23
PME# Signal Wake-up Support..............................................................23
WAKE# Signal Wake-up Support ...........................................................23
ENERGY STAR* Capable ..............................................................................23
Onboard Power Button........................................................................................24
Onboard VR and CPU LEDs ..................................................................................25
Speaker............................................................................................................25
Battery.............................................................................................................26
Real-Time Clock.................................................................................................26
2Installing and Replacing Desktop Board Components
Before You Begin ...............................................................................................27
Installation Precautions.......................................................................................28
Prevent Power Supply Overload ....................................................................28
Observe Safety and Regulatory Requirements.................................................28
Installing the I/O Shield ......................................................................................29
Installing and Removing the Desktop Board ...........................................................30

Intel Desktop Board DX48BT2 Product Guide
vi
Installing and Removing a Processor.....................................................................31
Installing a Processor ..................................................................................31
Installing the Processor Fan Heat Sink ...........................................................35
Connecting the Processor Fan Heat Sink Cable................................................35
Removing the Processor ..............................................................................36
Installing the ICH Heat Sink Decorative Cover (Optional) .........................................36
Installing an MCH Heat Sink Fan (Optional)............................................................37
Installing and Removing Memory..........................................................................38
Guidelines for Dual Channel Memory Configuration..........................................38
Two or Four DIMMs .............................................................................38
Three DIMMs ......................................................................................39
Installing DIMMs ........................................................................................40
Removing DIMMs........................................................................................42
Installing and Removing a PCI Express x16 Card ....................................................43
Installing Multiple PCI Express x16 Graphics Cards ..........................................43
Installing a PCI Express x16 Card .................................................................44
Removing a PCI Express x16 Card ................................................................45
Connecting the IDE Cable....................................................................................46
Connecting the Serial ATA (SATA) Cables ..............................................................47
Connecting to the Internal Headers and Connectors ................................................48
Front Panel Audio Header ............................................................................49
HD Audio Link Header .................................................................................49
Consumer IR (CIR) Headers .........................................................................49
Chassis Intrusion Header .............................................................................50
IEEE 1394a Header.....................................................................................51
USB 2.0 Headers ........................................................................................51
Front Panel Header .....................................................................................52
Alternate Front Panel Power LED Header ........................................................52
S/PDIF Connector.......................................................................................52
Connecting to the Flexible Audio System ...............................................................53
Connecting Chassis Fan and Power Supply Cables...................................................54
Connecting Chassis Fan Cables .....................................................................54
Connecting Power Supply Cables ..................................................................55
Setting the BIOS Configuration Jumper .................................................................56
Clearing Passwords ............................................................................................57
Replacing the Battery .........................................................................................58
3Updating the BIOS
Updating the BIOS with the Intel®Express BIOS Update Utility.................................63
Updating the BIOS with the ISO Image BIOS Update File or the Iflash
Memory Update Utility...................................................................................64
Obtaining the BIOS Update File ....................................................................64
Updating the BIOS with the ISO Image BIOS Update File .................................64
Updating the BIOS with the Iflash Memory Update Utility .................................65
Recovering the BIOS...................................................................................66
4Configuring for RAID
Configuring for RAID Using Intel®Matrix Storage Technology ...................................67
Configuring the BIOS ..................................................................................67
Creating Your RAID Set ...............................................................................67
Loading the Intel Matrix Storage Technology RAID Drivers and Software ............68
Setting Up a “RAID Ready” System ...............................................................68

Contents
vii
Configuring for External RAID Using Marvell* Storage Technology.............................69
Configuring the BIOS ..................................................................................69
Creating Your RAID Set ...............................................................................69
Loading the Marvell Storage Technology RAID Drivers and Software ..................69
AError Messages and Indicators
BIOS Beep Codes...............................................................................................71
BIOS Error Messages..........................................................................................71
B Regulatory Compliance
Safety Standards ...............................................................................................73
Place Battery Marking .................................................................................73
European Union Declaration of Conformity Statement..............................................74
Product Ecology Statements ................................................................................75
Recycling Considerations .............................................................................75
Lead-free 2LI/Pb-free 2LI Board ...................................................................78
Restriction of Hazardous Substances (RoHS) ..................................................79
EU RoHS ............................................................................................79
China RoHS ........................................................................................80
EMC Regulations ................................................................................................82
Ensure Electromagnetic Compatibility (EMC) Compliance..................................83
Product Certifications..........................................................................................84
Board-Level Certification Markings ................................................................84
Chassis and Component Certifications............................................................85
Figures
1. Desktop Board DX48BT2 Components .............................................................11
2. LAN Connector LEDs .....................................................................................16
3. Location of the Standby Power Indicator ..........................................................22
4. Onboard Power Button ..................................................................................24
5. Location of the VR and CPU LEDs ....................................................................25
6. Installing the I/O Shield ................................................................................29
7. Desktop Board DX48BT2 Mounting Screw Hole Locations....................................30
8. Lift the Socket Lever .....................................................................................31
9. Lift the Load Plate.........................................................................................32
10. Remove the Protective Socket Cover ...............................................................32
11. Remove the Processor from the Protective Processor Cover ................................33
12. Install the Processor .....................................................................................33
13. Close the Load Plate .....................................................................................34
14. Connecting the Processor Fan Heat Sink Cable to the Processor Fan Header..........35
15. Installing the ICH Heat Sink Decorative Cover ..................................................36
16. Installation of a Typical MCH Heat Sink Fan......................................................37
17. Dual Channel Memory Configuration with Two DIMMs ........................................38
18. Dual Channel Memory Configuration with Four DIMMs........................................39
19. Dual Channel Memory Configuration with Three DIMMs......................................39
20. Use DDR3 DIMMs .........................................................................................40
21. Installing a DIMM .........................................................................................41
22. Installing PCI Express x16 Graphics Cards........................................................43
23. Installing a PCI Express x16 Card ...................................................................44
24. Removing a PCI Express x16 Card ..................................................................45

Intel Desktop Board DX48BT2 Product Guide
viii
25. Connecting the IDE Cable ..............................................................................46
26. Connecting a Serial ATA Cable........................................................................47
27. Internal Headers and Connectors ....................................................................48
28. Back Panel Audio Connectors .........................................................................53
29. Location of the Chassis Fan Headers................................................................54
30. Connecting Power Supply Cables ....................................................................55
31. Location of the BIOS Configuration Jumper Block ..............................................56
32. Removing the Battery ...................................................................................62
33. Desktop Board DX48BT2 China RoHS Material Self Declaration Table ...................81
Tables
1. Feature Summary.......................................................................................... 9
2. Desktop Board DX48BT2 Components .............................................................12
3. LAN Connector LEDs .....................................................................................16
4. Front Panel Audio Header Signal Names...........................................................49
5. HD Audio Link Header Signal Names ...............................................................49
6. Front Panel CIR Receiver (Input) Header Signal Names......................................50
7. Back Panel CIR Header Emitter (Output) Header Signal Names ...........................50
8. Chassis Intrusion Header Signal Names ...........................................................50
9. IEEE 1394a Header Signal Names ...................................................................51
10. USB 2.0 Header Signal Names........................................................................51
11. Front Panel Header Signal Names ...................................................................52
12. Alternate Front Panel Power LED Header Signal Names ......................................52
13. S/PDIF Connector Signal Names .....................................................................52
14. Jumper Settings for the BIOS Setup Program Modes..........................................57
15. Beep Codes .................................................................................................71
16. BIOS Error Messages ....................................................................................71
17. Safety Standards..........................................................................................73
18. Lead-Free Second Level Interconnect Marks .....................................................79
19. China RoHS Environmentally Friendly Use Period Mark .......................................80
20. EMC Regulations...........................................................................................82
21. Product Certification Markings ........................................................................84

9
1 Desktop Board Features
This chapter briefly describes the features of Intel®Desktop Board DX48BT2. Table 1
summarizes the major features of the Desktop Board.
Table 1. Feature Summary
Form Factor ATX (304.80 millimeters [12.00 inches] x 243.84 millimeters
[9.60 inches])
Processor Support for an Intel®processor in the LGA775 package
Main Memory •Four 240-pin, DDR3 1.5 V SDRAM Dual Inline Memory Module
(DIMM) sockets
•1600/1333/1066/800 MHz DDR3 SDRAM interface
•Support for up to 8 GB of system memory
Chipset Intel®X48 Express Chipset consisting of:
•Intel X48 Express Chipset Memory Controller Hub (MCH) with Direct
Media Interface interconnect
•Intel®82801IR I/O Controller Hub (ICH9R) supporting Intel®Matrix
Storage Technology
Graphics Support for Multiple PCI Express* graphics cards
Audio •Independent multi-streaming 8-channel (7.1) audio and 2-channel
audio subsystem, featuring:
―Intel®High Definition Audio interface
―IDT* STAC9274D audio codec
•HD Audio Link header
•HD Audio front panel header
•Onboard 3-pin S/PDIF connector
•ADAT* optical interface support from a back panel S/PDIF optical
port
Expansion
Capabilities
•Two PCI Express 2.0 x16 ports
•One PCI Express 1.1 x4 port (routed to a x16 connector)
•Two PCI* bus connectors
Legacy I/O Support Legacy I/O Controller that provides Consumer Infrared (CIR) support
Peripheral
Interfaces
•Up to 12 USB 2.0 ports:
―Eight ports routed to the back panel
―Four ports routed to two USB headers
•Up to two IEEE 1394a ports:
―One port routed to the back panel
―One port routed to an IEEE 1394a header
•Six Serial ATA (SATA) channels (3.0 Gb/s) via ICH9R
•Two external SATA (eSATA) channels via a discrete controller
•One IDE interface with ATA-66/100 support (two devices)
RAID •Intel®Matrix Storage Technology for Serial ATA
continued

Intel Desktop Board DX48BT2 Product Guide
10
Table 1. Feature Summary (continued)
LAN Support Intel®82566DC Gigabit (10/100/1000 Mb/s) Ethernet LAN controller
including an RJ-45 back panel connector with integrated status LEDs
BIOS •Intel®Platform Innovation Framework for extensible firmware
interface
•16 Mb symmetrical flash memory device
•Support for SMBIOS
•Intel®Rapid BIOS Boot
•Intel®Express BIOS Update
Power Management •Support for Advanced Configuration and Power Interface (ACPI)
•Suspend to RAM (STR)
•Wake on USB, PCI, PCI Express, LAN, CIR, and front panel
•ENERGY STAR* capable
Hardware
Management
Hardware monitor with:
•Four fan sensing inputs used to monitor fan activity
•Intel®Precision Cooling Technology fan speed control
•Voltage sensing to detect out of range values
Related Links:
For more information about Desktop Board DX48BT2, including the Technical Product
Specification (TPS), BIOS updates, and device drivers, go to:
http://support.intel.com/support/motherboards/desktop/
Supported Operating Systems
The Desktop Board supports the following operating systems:
•Microsoft Windows Vista* Ultimate
•Microsoft Windows Vista Enterprise
•Microsoft Windows Vista Business
•Microsoft Windows Vista Home Premium
•Microsoft Windows Vista Home Basic
•Microsoft Windows Vista Ultimate 64-bit edition
•Microsoft Windows Vista Enterprise 64-bit edition
•Microsoft Windows Vista Business 64-bit edition
•Microsoft Windows Vista Home Premium 64-bit edition
•Microsoft Windows Vista Home Basic 64-bit edition
•Microsoft Windows* XP Media Center Edition 2005
•Microsoft Windows XP Professional
•Microsoft Windows XP Professional x64 Edition
•Microsoft Windows XP Home

Desktop Board Features
11
Desktop Board Components
Figure 1 shows the approximate location of the major components on Desktop Board
DX48BT2.
Figure 1. Desktop Board DX48BT2 Components

Intel Desktop Board DX48BT2 Product Guide
12
Table 2. Desktop Board DX48BT2 Components
Label Description
A Rear chassis fan header 2 (4-pin)
B PCI bus connector 2
C PCI Express 1.1 x16 (x4 electrical) connector
D PCI bus connector 1
E PCI Express 2.0 x16 secondary connector
F Front panel audio header
G PCI Express 2.0 x16 primary connector
H Rear chassis fan header (3-pin)
I MCH fan header (3-pin)
J Back panel connectors
K 12 V processor core voltage connector (2 x 4 pin)
L Processor socket
M Processor fan header (4-pin)
N DDR3 DIMM 0 sockets
O DDR3 DIMM 1 sockets
P IDE connector
Q Main power connector (2 x 12 pin)
R Front chassis fan header (3-pin)
S Chassis intrusion header
T Battery
U Serial ATA connectors
V USB 2.0 headers
W Speaker
X IEEE 1394a header
Y BIOS configuration jumper block
Z Onboard power button
AA Alternate front panel power LED header
BB Front panel CIR receiver (input) header
CC Back panel CIR transmitter (output) header
DD Front panel header
EE High Definition Audio Link header
FF Auxiliary PCI Express graphics power connector (1 x 4 pin)
GG S/PDIF connector

Desktop Board Features
13
Related Links:
Go to the following links for more information about:
•Desktop Board DX48BT2 http://www.intel.com/design/motherbd
http://support.intel.com/support/motherboards/
desktop
•Supported processors http://www.intel.com/go/findCPU
•Audio software and utilities http://www.intel.com/design/motherbd
•LAN software and drivers http://www.intel.com/design/motherbd
Processor
CAUTION
Failure to use an appropriate power supply and/or not connecting the 12 V (2 x 2 pin)
power connector to the Desktop Board may result in damage to the board, or the
system may not function properly.
Desktop Board DX48BT2 supports an Intel processor in the LGA775 package.
Processors are not included with the Desktop Board and must be purchased
separately. The processor connects to the Desktop Board through the LGA775 socket.
Related Links:
Go to the following page or link for more information about:
•Instructions on installing or upgrading the processor, page 31 in Chapter 2
•Supported processors for Desktop Board DX48BT2,
http://www.intel.com/go/findCPU

Intel Desktop Board DX48BT2 Product Guide
14
Main Memory
NOTE
To be fully compliant with all applicable Intel
®SDRAM memory specifications, the
board should be populated with DIMMs that support the Serial Presence Detect (SPD)
data structure. If your memory modules do not support SPD, you will see a
notification to this effect on the screen at power up. The BIOS will attempt to
configure the memory controller for normal operation.
The Desktop Board supports the dual or single channel memory configurations defined
below:
•Four 240-pin Double Data Rate 3 (DDR3) SDRAM Dual Inline Memory Module
(DIMM) connectors with gold-plated contacts.
•1600/1333/1066/800 MHz DDR3 SDRAM interface
•Unbuffered, non-registered single or double-sided DIMMs
•Non-ECC DDR3 memory
•Serial Presence Detect (SPD) memory only
•Up to 4.0 GB utilizing 512 Mb or 1 Gb technology
•Up to 8.0 GB utilizing 1 Gb technology
NOTE
For 1600 MHz memory, only two DIMMs are supported for a maximum of 4 GB utilizing
1 Gb memory technology. DIMMs should be configured as a matched pair equal in
speed and size in DIMM 0 and DIMM 1 of channel B.
Related Links:
Go to the following links or pages for more information about:
•SDRAM specifications, http://www.intel.com/technology/memory/
•Installing memory, page 37 in Chapter 2
•Tested memory, http://www.cmtlabs.com/mbsearch.asp

Desktop Board Features
15
Intel®X48 Express Chipset
The Intel X48 Express Chipset consists of the following devices:
•Intel X48 Express Chipset Memory Controller Hub (MCH) with Direct Media
Interface (DMI) interconnect
•Intel 82801IR I/O Controller Hub (ICH9R) with DMI interconnect
The MCH provides interfaces to the processor, memory, PCI Express bus, and the DMI
interconnect. ICH9R is a centralized controller for the board’s I/O paths.
Related Links:
Go to the following link for more information about the Intel X48 Express Chipset:
http://developer.intel.com/products/chipsets/index.htm
Audio Subsystem
The onboard audio subsystem consists of the following components:
•Intel®ICH9R I/O controller hub
•IDT STAC9274D audio codec
The subsystem has the following headers and connectors:
•Back panel audio connectors, including an S/PDIF optical port
•High Definition (HD) Audio front panel header that provides mic in and line out
signals for front panel audio connectors
•HD Audio Link header used for HDMI video cards
•S/PDIF connector that can be used for HDMI video cards that do not work with the
HD Audio Link header
The audio subsystem supports the following features:
•Dolby* Home Theater
•A signal-to-noise (S/N) ratio of 95 dB
•Independent multi-streaming 8-channel (7.1) audio (using the back panel audio
connectors) and 2-channel audio (using the Intel High Definition Audio front panel
header)
•ADAT optical interface support via the back panel S/PDIF optical port
Related Links:
Go to the following link or pages for more information about:
•Audio drivers and utilities http://support.intel.com/support/motherboards/desktop/
•The location of the onboard audio headers, Figure 27 on page 48
•The signal names for the Intel High Definition Audio front panel header and the HD
Audio Link header, page 49
•The back panel audio connectors, Figure 28 on page 53

Intel Desktop Board DX48BT2 Product Guide
16
LAN Subsystem
The LAN subsystem includes:
•Intel ICH9R
•Intel 82566DC Gigabit (10/100/1000 Mb/s) Ethernet LAN controller
•RJ-45 LAN connector with integrated status LEDs
The subsystem features:
•CSMA/CD protocol engine
•LAN connect interface between ICH9R and the LAN controller
•PCI bus power management
Related Links:
Go to the following link for information about LAN software and drivers:
http://support.intel.com/support/motherboards/desktop
Two LEDs are built into the RJ-45 LAN connector located on the back panel (see
Figure 2). These LEDs indicate the status of the LAN.
Figure 2. LAN Connector LEDs
Table 3 describes the LED states when the board is powered up and the LAN
subsystem is operating.
Table 3. LAN Connector LEDs
LED LED Color LED State Indicates
A Off LAN link is not established
Green
On LAN link is established
Blinking LAN activity is occurring
N/A Off 10 Mb/s data rate
Green On 100 Mb/s data rate
B
Yellow On 1000 Mb/s data rate

Desktop Board Features
17
USB 2.0 Support
The Desktop Board supports up to 12 USB 2.0 ports (eight ports routed to back panel
connectors and four ports routed to two onboard headers) via the ICH9R. USB 2.0
ports are backward compatible with USB 1.1 devices. USB 1.1 devices will function
normally at USB 1.1 speeds.
USB 2.0 support requires both an operating system and drivers that fully support
USB 2.0 transfer rates. Disabling Hi-Speed USB in the BIOS reverts all USB 2.0 ports
to USB 1.1 operation. This may be required to accommodate operating systems that
do not support USB 2.0.
Enhanced IDE Interface
The board’s IDE interface handles the exchange of information between the processor
and peripheral devices such as hard disk drives and CD-ROM drives. The interface
supports:
•Up to two IDE devices (such as hard drives)
•ATAPI-style devices (such as CD-ROM drives)
•Older PIO Mode devices
•Ultra DMA-33 and ATA-66/100 protocols
Serial ATA
Desktop Board DX48BT2 supports six onboard Serial ATA channels (3.0 Gb/s) via
ICH9R and two eSATA channels (3.0 Gb/s) via a discrete controller.
The six onboard Serial ATA channels provided by ICH9R support the following RAID
(Redundant Array of Independent Drives) levels:
•RAID 0 - data striping
•RAID 1 - data mirroring
•RAID 0+1 (or RAID 10) - data striping and data mirroring
•RAID 5 - distributed parity
For information on configuring your system for RAID using Intel®Matrix Storage
Technology see Chapter 4.
Legacy I/O
Desktop Board DX48BT2 includes an I/O controller that provides the following legacy
I/O features:
•Consumer Infrared (CIR) support
•Low pin count (LPC) interface
•Intelligent power management, including a programmable wake up event interface
•PCI power management support

Intel Desktop Board DX48BT2 Product Guide
18
Expandability
Desktop Board DX48BT2 provides the following expansion capability:
•Two PCI Express 2.0 x16 ports
•One PCI Express 1.1 x4 port (routed to a x16 connector)
•Two PCI bus connectors
BIOS
The BIOS provides the Power-On Self-Test (POST), the BIOS Setup program, and the
PCI/PCI Express and IDE auto-configuration utilities. The BIOS is stored in the Serial
Peripheral Interface (SPI) Flash device.
The BIOS can be updated by following the instructions on page 63 in Chapter 3.
Serial ATA and IDE Auto Configuration
If you install a Serial ATA or IDE device (such as a hard drive) in your computer, the
auto-configuration utility in the BIOS automatically detects and configures the device
for your computer. You do not need to run the BIOS Setup program after installing a
Serial ATA or IDE device. You can override the auto-configuration options by
specifying manual configuration in the BIOS Setup program.
PCI and PCI Express*Auto Configuration
If you install a PCI/PCI Express add-in card in your computer, the PCI/PCI Express
auto-configuration utility in the BIOS automatically detects and configures the
resources (IRQs, DMA channels, and I/O space) for that add-in card. You do not need
to run the BIOS Setup program after you install a PCI/PCI Express add-in card.
Security Passwords
The BIOS includes security features that restrict whether the BIOS Setup program can
be accessed and who can boot the computer. A supervisor password and a user
password can be set for the BIOS Setup and for booting the computer, with the
following restrictions:
•The supervisor password gives unrestricted access to view and change all Setup
options. If only the supervisor password is set, pressing <Enter> at the password
prompt of Setup gives the user restricted access to Setup.
•If both the supervisor and user passwords are set, you must enter either the
supervisor password or the user password to access Setup. Setup options are then
available for viewing and changing depending on whether the supervisor or user
password was entered.

Desktop Board Features
19
•Setting a user password restricts who can boot the computer. The password
prompt is displayed before the computer is booted. If only the supervisor
password is set, the computer boots without asking for a password. If both
passwords are set, you can enter either password to boot the computer.
Related Links:
For instructions on resetting the password, go to Clearing Passwords on page 57.
Hardware Management
The hardware management features of Desktop Board DX48BT2 enable the board to
be compatible with the Wired for Management (WfM) specification. The board has
several hardware management features including the following:
•Fan speed monitoring and control
•Thermal and voltage monitoring
•Chassis intrusion detection
Hardware Monitoring and Fan Speed Control
The features of the hardware monitoring and fan speed control include:
•Monitoring of power supply voltages to detect levels above and below acceptable
values
•Intel®Precision Cooling Technology fan speed control, delivering acoustically-
optimized thermal management
•A thermal sensor in the processor
•Thermally monitored closed-loop fan control, for all onboard fans, that can adjust
fan speed or switch the fans off as needed
Intel®Precision Cooling Technology
Intel Precision Cooling Technology automatically adjust processor fan speed based on
the processor temperature and adjusts chassis fan speeds based on the internal
system temperature.
Chassis Intrusion
The board supports a chassis security feature that detects if the chassis cover has
been removed. The security feature uses a mechanical switch on the chassis that can
be connected to the chassis intrusion header on the Desktop Board. See Figure 27 for
the location of the chassis intrusion header.

Intel Desktop Board DX48BT2 Product Guide
20
Power Management
Power management is implemented at several levels, including software support
through the Advanced Configuration and Power Interface (ACPI) and the following
hardware support:
•Power connectors
•Fan headers
•LAN wake capabilities
•Instantly Available PC technology (Suspend to RAM)
•+5 V standby power indicator LED
•Wake from USB
•Power Management Event signal (PME#) wakeup support
•WAKE# signal wake-up support
•ENERGY STAR capable
Software Support
ACPI
ACPI gives the operating system direct control over the power management and Plug
and Play functions of a computer. The use of ACPI with the Desktop Board requires an
operating system that provides full ACPI support.
Hardware Support
Power Connectors
ATX12V-compliant power supplies can turn off the computer power through system
control. When an ACPI-enabled computer receives the correct command, the power
supply removes all non-standby voltages.
When resuming from an AC power failure, the computer returns to the power state it
was in before power was interrupted (either on or off). The computer’s response can
be set by using the Last Power State feature in the BIOS Setup program’s Boot menu.
The Desktop Board has three power connectors. See Figure 30 on page 55 for the
location of the power connectors.