Intel D945GNT User manual

Intel® Desktop Board
D945GNT
Specification Update
Release Date: November 2007
Order Number: D23992-007US
The Intel®Desktop Board D945GNT may contain design defects or errors known as errata, which may cause the product to deviate
from published specifications. Current characterized errata are documented in this Specification Update.

2 Intel Desktop Board D945GNT Specification Update
Revision History
Revision Revision History Date
-001 This document is the first Specification Update for the
Intel®Desktop Board D945GNT. May 26, 2005
-002 Added Erratum 1 and updated General Information table. October 2005
-003 Updated Erratum 1. Added Erratum 2. Updated Basic Desktop
Board D945GNT Identification Information table. June 2006
-004 Added Specification Changes 1, Erratum 3 and updated General
Information table. July 2006
-005 Updated General Information table and added Specification
Changes 2. November 2006
-006 Updated General Information table and added Specification
Changes 3. February 2007
-007 Updated the General Information table. November 2007
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conflicts or incompatibilities arising from future changes to them.
The Intel®Desktop Board D945GNT 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 before placing your
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Copyright ©2007 Intel Corporation.

Intel Desktop Board D945GNT Specification Update 3
Contents
Specfication Update for the Intel®Desktop Board D945GNT
Terminology ............................................................................................ 5
General Information .................................................................................5
Summary of Changes ............................................................................... 7
Specification Changes...............................................................................7
Errata.....................................................................................................8

4 Intel Desktop Board D945GNT Specification Update
Specfication Update for the
Intel®Desktop Board D945GNT
This document is an update to the specifications contained in the Intel®Desktop Board
D945GNT Technical Product Specification (Order number D14069). It is intended for
hardware system manufacturers and software developers of applications, operating
systems, or tools. It will contain Specification Changes, Errata, Specification
Clarifications, and Documentation Changes.
For specification updates concerning the Intel processor that may apply to this desktop
board, refer to the following:
•Intel®Pentium®D Processor 900∆Sequence and Intel®Pentium®Processor
Extreme Edition 955Δ, 965ΔSpecification Update (Order Number 310307)
•Intel®Pentium®D Processor 800∆Sequence and Intel
®Pentium®Processor
Extreme Edition 840∆Specification Update (Order Number 306832)
•Intel®Celeron®D Processors 300ΔSequence Specification Update (Order
Number 302354)
•Intel®Pentium®4 Processor Specification Update (Order Number 249199)
Unless otherwise noted in this document, it should be assumed that any processor
errata for a given stepping are applicable to the Altered Assembly (AA) revision(s)
associated with that stepping.
Refer to the Intel®945G/945GZ/945P/945PL Express Chipset Family Specification
Update (Order Number 307503) for specification updates concerning the 82945G
GMCH Controller and that may apply to the desktop board D945GNT. Unless
otherwise noted in this document, it should be assumed that any GMCH errata for a
given stepping are applicable to the Altered Assembly (AA) revision(s) associated with
that stepping.
Refer to the Intel®I/O Controller Hub 7 (ICH7) Family Specification Update
(Order Number 307014) for specification updates concerning the 82801GB ICH7 and
82801GR ICH7R I/O Controller Hub and that may apply to the desktop board
D945GNT. Unless otherwise noted in this document, it should be assumed that any
ICH 7 errata for a given stepping are applicable to the Altered Assembly (AA)
revision(s) associated with that stepping.

Intel Desktop Board D945GNT Specification Update 5
Terminology
Specification Changes are modifications to the current published specifications.
These changes will be incorporated in the next release of the specifications.
Errata are design defects or errors. Characterized errata may cause the desktop
board behavior to deviate from published specifications. Hardware and software
designed to be used with any given Altered Assembly (AA) and BIOS revision level
must assume that all errata documented for that AA and BIOS revision level are
present on all desktop boards.
Specification Clarifications describe a specification in greater detail or further
highlight a specification’s impact to a complex design situation. These clarifications
will be incorporated in the next release of the specifications.
Documentation Changes include typos, errors, or omissions from the current
published specifications. These changes will be incorporated in the next release of the
specifications.
General Information
Basic Desktop Board D945GNT Identification Information
AA Revision BIOS Revision Notes
C96315-409 NT94510J.86A.4089 1-2
C96315-408 NT94510J.86A.4076 1-2
C96315-407 NT94510J.86A.3996 1-2
C96315-406 NT94510J.86A.3996 1-2
C96315-405 NT94510J.86A.3528 1-2
C96315-404 NT94510J.86A.3239 1-2
C96315-403 NT94510J.86A.2487 1-2
C96315-402 NT94510J.86A.1616 1-2
C96315-401 NT94510J.86A.1042 1-2
C96320-407 NT94510J.86A.4089 1-2
C96320-406 NT94510J.86A.4076 1-2
C96320-405 NT94510J.86A.3996 1-2
C96320-404 NT94510J.86A.3996 1-2
C96320-403 NT94510J.86A.3996 1-2
C96320-402 NT94510J.86A.3528 1-2
C96320-401 NT94510J.86A.3239 1-2
C96320-400 NT94510J.86A.2487 1-2
C96320-305 NT94510J.86A.1616 1-2
C96320-304 NT94510J.86A.0980 1-2
C96324-406 NT94510J.86A.4089 1-2
C96324-405 NT94510J.86A.4076 1-2

6 Intel Desktop Board D945GNT Specification Update
AA Revision BIOS Revision Notes
C96324-404 NT94510J.86A.3996 1-2
C96324-403 NT94510J.86A.3996 1-2
C96324-402 NT94510J.86A.3528 1-2
C96324-401 NT94510J.86A.3239 1-2
C96324-400 NT94510J.86A.2487 1-2
C96324-305 NT94510J.86A.1616 1-2
C96324-304 NT94510J.86A.0980 1-2
NOTES:
1. The AA number is found on a small label on the component side of the board.
2. The 945 Chipset kit used on this AA revision consists of two components as follows:
Device Stepping S-Spec Numbers
82945G GMCH A2 SL8FU
82801GB ICH7 A1 SL8FX
82801GR ICH7R A1 SL8FY

Intel Desktop Board D945GNT Specification Update 7
Summary of Changes
The following table indicates the Specification Changes, Errata, Specification
Clarifications, or Documentation Changes that apply to the Intel®Desktop Board
D945GNT. Intel intends to fix some of the errata in a future revision of the desktop
board, and to account for the other outstanding issues through documentation or
specification changes as noted.
The following notations are used in the table:
Doc: Document change or update that will be implemented.
Plan Fix: This erratum may be fixed in a future revision of the desktop board, driver, or BIOS.
Fixed: This erratum has been previously fixed.
No Fix: There are no plans to fix this erratum.
Shaded: This erratum is either new or modified from the previous version of the document.
No. Plans Specification Changes
1 Doc Change to Section 2.8.2.3, Add-in Card Connectors
2 Doc Changes to Section 1.9.2 Audio Connectors
3 Doc Changes to Section 1.10.3.1 Intel®82573E/82573V/82574V Gigabit Ethernet
Controller
No. Plans Errata
1 Plan Fix Hardware Monitoring and Fan Control Could Fail and Only Run at a Maximum or
Minimum PWM for CPU Fan
2 Plan Fix Digital Noise May Affect Audio Quality When Using the Rear MIC Input on boards with
a 6-Channel (5.1) Audio Subsystem
3 Plan Fix The placement of capacitors behind PCI Express* x1 connector slot 1 may prohibit
some PCI Express x1 add-in cards from properly connecting to the motherboard
Specification Changes
1. The following note will be added to the Technical Product Specification in
Section 2.8.2.3 Add-in Card Connectors:

NOTE
Capacitors required for the audio circuitry are located within the ATX keep-out
area near PCI Express* x1 slot 1, and may limit the use of some PCI Express
x1 cards.

8 Intel Desktop Board D945GNT Specification Update
2. The following note will be added to the Technical Product Specification in
Section 1.9.2 Audio Connectors:
 INTEGRATOR’S NOTES
Electrostatic discharge (ESD) can damage desktop board components. Front-
panel connectors should provide sufficient protection to prevent ESD damage
to components inside the chassis enclosure.
3. Section 1.10.3.1 of the Technical Specification will be updated in its entirety as
follows to remove reference to Jumbo frame support.
1.10.3.1 Intel®82573E/82573V/82574V Gigabit Ethernet Controller
The Intel®82573E/82573V/82574V Gigabit Ethernet Controller supports the following
features:
•PCI Express link
•10/100/1000 IEEE 802.3 compliant
•Compliant to IEEE 802.3x flow control support
•TCP, IP, UDP checksum offload
•Transmit TCP segmentation
•Advanced packet filtering
•Full device driver compatibility
•PCI Express Power Management Support
Errata
1. Hardware Monitoring and Fan Control Could Fail and Only Run at a Maximum or
Minimum PWM for CPU Fan
PROBLEM:The Hardware Monitoring and Fan Control may only support up to 3.6V
on its Pulse Width Modulation (PWM) outputs. The 4-pin fans used with the Intel
Desktop board could have a pull up voltage as high as 5.25V, potentially causing
failures in the circuit used for fan control on this Intel Desktop Board.
IMPLICATION:If Hardware Monitoring and Fan Control fails due to this erratum, the
CPU fan could run at either 100% PWM, or at a minimum PWM (normally set to
30% PWM for four-pin CPU fans). A failure at 100% PWM could result in louder
system acoustics. A failure at minimum PWM may result in the reduced heat sink
efficiency being insufficient to fully support the processor thermal requirements at
some higher work loads. A variety of conditions such as room temperature, heat
sink characteristics, application, workload and chassis design will affect the impact
of the PWM failure. If the thermal requirements of the processor are not met, the
processor will attempt to reduce its own temperature. Depending on the severity
of the ASIC failure, this may result in a noticeable performance reduction.
WORKAROUND:None
STATUS:This erratum has been fixed. Refer to the Product Change Notification
105498-01 available at
http://developer.intel.com/design/pcn/MTHRBRD/index.htm.

Intel Desktop Board D945GNT Specification Update 9
2. Digital Noise May Affect Audio Quality When Using the Rear MIC Input on boards
with a 6-Channel (5.1) Audio Subsystem
PROBLEM:Digital noise may affect audio quality when using the rear MIC input on
boards with a 6-Channel (5.1) Audio Subsystem. The digital noise can affect the
MIC signal via the Codec’s MIC bias voltage.
IMPLICATION:Digital noise may be heard on the rear MIC input when systems are
used in the following configuration: input monitor enabled in drivers, MIC boost set
to 20dB gain, and MIC volume set to maximum. The digital noise may be heard
when recording voice, during voice chat, when dragging window around the screen,
or when opening and closing windows. No noise issues have been associated with
the front panel MIC input.
WORKAROUND:None
STATUS:This erratum may be fixed in a future board revision.
3. The placement of capacitors behind PCI Express* x1 connector slot 1 may prohibit
some PCI Express x1 add-in cards from properly connecting to the motherboard
PROBLEM:Due to the design and placement of the audio circuitry on this
motherboard, it was necessary to position capacitors in the keep-out zone behind
PCI Express* x1 connector slot 1.
IMPLICATION:Some PCI Express x1 add-in cards may not fully connect to PCI
Express x1 connector slot 1, due to interference between capacitors in the keep-
out zone and I/O connectors on the add-in card that are located on the I/O
bracket, in line with the edge fingers on the card.
WORKAROUND:None
STATUS:May be fixed in a later hardware revision.