Intel S875WP1LX User manual

Intel®Server Board
S875WP1-E
Technical Product Specification
Intel order number C40538-003
Revision 4.0
November 2003
Enterprise Platforms and Services Marketing

Revision History S875WP1-E TPS
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Revision History
Date Revision
Number Modifications
May 2003 1.0 Initial Release.
June 2003 2.0 Updated mechanical drawing and I/O shield drawing.
June 2003 3.0 Added correct calculated MTBF numbers and additional notes about ATX12V
power supply support.
November
2003 4.0 Additional notes regarding Serial ATA controller for S875WP1LX sku
This product specification applies to the Intel® Server Board S875WP1-E with BIOS identifier
WP87510A.86B.
Changes to this specification will be published in the Intel Server Board S875WP1-E
Specification Update before being incorporated into a revision of this document.

S875WP1-E TPS Disclaimers
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Disclaimers
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.
The S875WP1-E 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.
Intel, Pentium, Itanium, and Xeon are trademarks or registered trademarks of Intel Corporation.
*Other brands and names may be claimed as the property of others.
Copyright © Intel Corporation 2003.

Table of Contents S875WP1-E TPS
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Table of Contents
1. Introduction ..........................................................................................................................6
2. Server Board Overview........................................................................................................6
2.1 S875WP1-E Feature Set.................................................................................................6
3. Functional Architecture.......................................................................................................6
3.1 Processor and Memory Subsystem.................................................................................6
3.1.1 Processor Support .....................................................................................................6
3.1.2 Memory Subsystem ...................................................................................................6
3.1.3 Memory Configurations..............................................................................................6
3.2 Intel 875P Chipset ...........................................................................................................6
3.2.1 AGP............................................................................................................................6
3.2.2 USB............................................................................................................................6
3.2.3 IDE Interfaces ............................................................................................................6
3.2.4 Real-Time Clock, CMOS SRAM, and Battery............................................................6
3.2.5 Intel 82802AC 8 Megabit Firmware Hub (FWH) ........................................................6
3.3 Serial ATA (SATA) Support.............................................................................................6
3.3.1 SATA Interfaces.........................................................................................................6
3.3.2 SATA RAID with ICH5-R Controller...........................................................................6
3.3.3 SATA RAID with Promise Technology*PDC20319....................................................6
3.4 I/O Controller ...................................................................................................................6
3.4.1 Serial Ports.................................................................................................................6
3.4.2 Parallel Port................................................................................................................6
3.4.3 Diskette Drive Controller............................................................................................6
3.4.4 Keyboard and Mouse Interface..................................................................................6
3.5 Hardware Management Subsystem.................................................................................6
3.5.1 Hardware Monitoring and Fan Control ASIC..............................................................6
3.5.2 Fan Monitoring...........................................................................................................6
3.5.3 Chassis Intrusion and Detection ................................................................................6
3.6 Power Management.........................................................................................................6
3.6.1 Advanced Configuration and Power Interface (ACPI)................................................6
3.6.2 Hardware Support......................................................................................................6
3.6.3 Standby Power (+5 V) Indicator LED.........................................................................6
3.7 Clock Generation and Distribution...................................................................................6

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3.8 PCI I/O Subsystem..........................................................................................................6
3.8.1 32-bit, 33-MHz PCI Subsystem..................................................................................6
3.8.2 Video Controller .........................................................................................................6
3.9 Network Interface Controller (NIC) Subsystem................................................................6
3.9.1 RJ-45 LAN Connectors with Integrated LEDs............................................................6
4. Maps and Interrupts.............................................................................................................6
4.1 Memory Map....................................................................................................................6
4.2 I/O Map............................................................................................................................6
4.3 DMA Channels.................................................................................................................6
4.4 PCI Configuration Space Map .........................................................................................6
4.5 Interrupts..........................................................................................................................6
4.6 PCI Interrupt Routing Map...............................................................................................6
5. Connectors and Jumper Blocks.........................................................................................6
5.1 Power Connectors ...........................................................................................................6
5.2 PCI Bus Connectors ........................................................................................................6
5.3 AGP Connector................................................................................................................6
5.4 Front Panel Connector.....................................................................................................6
5.5 VGA Connector................................................................................................................6
5.6 NIC /USB Connector........................................................................................................6
5.7 SATA/SATA RAID Connectors........................................................................................6
5.8 ICH5-R IDE Connectors ..................................................................................................6
5.9 Front Panel USB Header.................................................................................................6
5.10 Floppy Connector.........................................................................................................6
5.11 Serial Port Connector...................................................................................................6
5.12 Keyboard and Mouse Connector..................................................................................6
5.13 Miscellaneous Headers................................................................................................6
5.13.1 Fan Headers.............................................................................................................6
5.14 System Recovery and Update Jumper.........................................................................6
5.15 Clear CMOS Jumper....................................................................................................6
6. BIOS Features.......................................................................................................................6
6.1 BIOS Flash Memory Organization...................................................................................6
6.2 Resource Configuration...................................................................................................6
6.2.1 PCI Autoconfiguration................................................................................................6
6.2.2 PCI IDE Support.........................................................................................................6
6.3 System Management BIOS (SMBIOS)............................................................................6

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6.4 Legacy USB Support .......................................................................................................6
6.5 BIOS Updates..................................................................................................................6
6.5.1 Language Support......................................................................................................6
6.5.2 Custom Splash Screen ..............................................................................................6
6.6 Recovering BIOS Data ....................................................................................................6
6.7 Boot Options....................................................................................................................6
6.7.1 CD-ROM and Network Boot.......................................................................................6
6.7.2 Booting Without Attached Devices.............................................................................6
6.8 Fast Booting Systems with Intel®Rapid BIOS Boot .......................................................6
6.8.1 Intel Rapid BIOS Boot................................................................................................6
6.9 BIOS Security Features...................................................................................................6
7. BIOS Setup Program............................................................................................................6
7.1.1 Maintenance Menu.....................................................................................................6
7.1.2 Main Menu .................................................................................................................6
7.1.3 Advanced Menu.........................................................................................................6
7.1.4 Security Menu............................................................................................................6
7.1.5 Power Menu...............................................................................................................6
7.1.6 Boot Menu..................................................................................................................6
7.1.7 Exit Menu...................................................................................................................6
8. Error Reporting and Handling.............................................................................................6
8.1 Error Sources and Types.................................................................................................6
8.1.1 PCI Bus Errors ...........................................................................................................6
8.1.2 Processor Bus Errors.................................................................................................6
8.1.3 Single-Bit ECC Error Throttling Prevention................................................................6
8.1.4 Memory Bus Errors....................................................................................................6
8.2 BIOS Error Messages, POST Codes, and BIOS Beep Codes ........................................6
8.2.1 BIOS Error Messages ................................................................................................6
8.2.2 Port 80h POST Codes ...............................................................................................6
8.3 Bus Initialization Checkpoints..........................................................................................6
9. General Specifications.........................................................................................................6
9.1 Absolute Maximum Ratings.............................................................................................6
9.2 S875WP1-E Power Budget .............................................................................................6
9.3 Product Regulatory Compliance......................................................................................6
9.3.1 Product Safety Compliance........................................................................................6

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9.3.2 Product EMC Compliance..........................................................................................6
9.3.3 Product Regulatory Compliance Markings.................................................................6
9.4 Electromagnetic Compatibility Notices ............................................................................6
9.4.1 FCC (USA).................................................................................................................6
9.4.2 INDUSTRY CANADA (ICES-003)..............................................................................6
9.4.3 Europe (CE Declaration of Conformity)......................................................................6
9.4.4 Taiwan Declaration of Conformity..............................................................................6
9.4.5 Korean RRL Compliance ...........................................................................................6
9.4.6 Australia / New Zealand.............................................................................................6
9.5 Replacing the Back-Up Battery........................................................................................6
9.6 Calculated Mean Time Between Failures (MTBF)...........................................................6
9.7 Mechanical Specifications ...............................................................................................6
Glossary......................................................................................................................................VI

List of Figures S875WP1-E TPS
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List of Figures
Figure 1. Intel Server Board S875WP1-E Diagram ......................................................................6
Figure 2. Examples of Dual Channel Configuration with Dynamic Mode......................................6
Figure 3. Example of Dual Channel Configuration without Dynamic Mode ..................................6
Figure 4. Examples of Single Channel Configuration with Dynamic Mode...................................6
Figure 5. Examples of Single Channel Configuration without Dynamic Mode..............................6
Figure 6. Intel 875P Chipset Block Diagram.................................................................................6
Figure 7. USB Port Configuration .................................................................................................6
Figure 8. Location of the Standby Power Indicator LED (CR7J1).................................................6
Figure 9. LAN Connector LED Locations......................................................................................6
Figure 10. S875WP1-E Server Board Mechanical Drawing .........................................................6
Figure 11. Intel Server Board S875WP1-E I/O Shield Drawing....................................................6

S875WP1-E TPS List of Tables
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List of Tables
Table 1. Processor Support Matrix ...............................................................................................6
Table 2. Supported Memory Configurations.................................................................................6
Table 3. Supported System Bus Frequency and Memory Speed Combinations..........................6
Table 4. Characteristics of Dual/Single Channel Configuration with/without Dynamic Mode.......6
Table 5. Effects of Pressing the Power Switch.............................................................................6
Table 6. Power States and Targeted System Power....................................................................6
Table 7. Wake-up Devices and Events.........................................................................................6
Table 8. Fan Connector Function/Operation.................................................................................6
Table 9. PCI Bus Characteristics..................................................................................................6
Table 10. PCI Bus Configuration IDs............................................................................................6
Table 11. Video Modes.................................................................................................................6
Table 12. 10/100 Ethernet LAN Connector LEDs.........................................................................6
Table 13. 10/100/1000 LAN Connector LED States.....................................................................6
Table 14. System Memory Map....................................................................................................6
Table 15. I/O Map.........................................................................................................................6
Table 16. DMA Channels..............................................................................................................6
Table 17. PCI Configuration Space Map ......................................................................................6
Table 18. Interrupts.......................................................................................................................6
Table 19. PCI Interrupt Routing Map............................................................................................6
Table 20. Power Connector Pin-out (J2J2)...................................................................................6
Table 21. 12V CPU Power Connector (J4C1) ..............................................................................6
Table 22. Auxiliary Power Connector (J4J1).................................................................................6
Table 23. PCI Bus Connectors .....................................................................................................6
Table 24. AGP Connector.............................................................................................................6
Table 25. High-Density Front Panel 34-Pin Header Pin Out (J7J1)..............................................6
Table 26. VGA Connector Pin-out (J3A1).....................................................................................6
Table 27. Magjack3 Connector (dual USB + RJ45, Gbe) Pin Out (JA4A1)..................................6
Table 28. Magjack3 Connector (dual USB + RJ45, 10/100) Pin Out (JA5A1)..............................6
Table 29. SATA 7-pin Connectors Pin Out (J9E1, J9F1, J9G1, J9H1, J9H2, J9J2).....................6
Table 30. ICH5-R IDE 40-pin Connector Pin Out (J5J1, J6J1).....................................................6
Table 31. Front Panel USB Connector Pin-out (J7E1) .................................................................6
Table 32. 34-pin Floppy Connector Pin Out (J3J1).......................................................................6

List of Tables S875WP1-E TPS
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Table 33. 9-pin Serial A Port Pin Out (J2A1) ................................................................................6
Table 34. 10-pin Header Serial B Port Pin Out (J6J4)..................................................................6
Table 35. Keyboard /Mouse PS/2 Connector Pin Out (J1A1).......................................................6
Table 36. Three-Pin Fan Headers Pin-Out...................................................................................6
Table 37. BIOS Setup Configuration Jumper Settings (J8J2).......................................................6
Table 38. Clear CMOS Jumper Settings (J8G1)...........................................................................6
Table 39. Supervisor and User Password Functions....................................................................6
Table 40. BIOS Setup Program Menu Bar....................................................................................6
Table 41. BIOS Setup Program Function Keys ............................................................................6
Table 42. Maintenance Menu .......................................................................................................6
Table 43. Main Menu....................................................................................................................6
Table 44. Advanced Menu............................................................................................................6
Table 45. PCI Configuration Submenu.........................................................................................6
Table 46. Boot Configuration Submenu........................................................................................6
Table 47. Peripheral Configuration Submenu...............................................................................6
Table 48. Drive Configuration Submenu.......................................................................................6
Table 49. Primary/Secondary Master/Slave Submenus ...............................................................6
Table 50. Floppy Configuration Submenu ....................................................................................6
Table 51. Event Log Configuration Submenu...............................................................................6
Table 52. Video Configuration Submenu......................................................................................6
Table 53. USB Configuration Submenu........................................................................................6
Table 54. Chipset Configuration Submenu...................................................................................6
Table 55. Fan Control Configuration Submenu ............................................................................6
Table 56. Hardware Monitoring Submenu....................................................................................6
Table 57. Remote Access Configuration Submenu......................................................................6
Table 58. Security Menu...............................................................................................................6
Table 59. Power Menu..................................................................................................................6
Table 60. ACPI Submenu.............................................................................................................6
Table 61. Boot Menu.....................................................................................................................6
Table 62. Boot Device Priority Submenu......................................................................................6
Table 63. Hard Disk Drives Submenu...........................................................................................6
Table 64. Removable Devices Submenu......................................................................................6
Table 65. ATAPI CDROM Drives Submenu..................................................................................6
Table 66. Exit Menu......................................................................................................................6
Table 67. BIOS Error Messages...................................................................................................6

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Table 68. Uncompressed INIT Code Checkpoints........................................................................6
Table 69 Boot Block Recovery Code Checkpoints.......................................................................6
Table 70. Runtime Code Uncompressed in F000 Shadow RAM..................................................6
Table 71. BIOS Beep Codes.........................................................................................................6
Table 72. Bus Initialization Checkpoints.......................................................................................6
Table 73. Upper Nibble High Byte Functions................................................................................6
Table 74. Lower Nibble High Byte Functions................................................................................6
Table 75. Absolute Maximum Ratings..........................................................................................6
Table 76. S875WP1-E Power Budget...........................................................................................6

List of Tables S875WP1-E TPS
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S875WP1-E Introduction
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1. Introduction
The S875WP1-E Technical Product Specification (TPS) provides a high-level technical
description for the Intel®Server Board S875WP1-E. It details the architecture and feature set for
all functional sub-systems that make up the server board.
This TPS covers both versions of the Intel Server Board S875WP1-E, which includes product
codes: S875WP1 and S875WP1LX. When appropriate, the specific product code is used to
relay information that pertains only to a specific version of the Intel Server Board S875WP1-E.
This document is divided into the following main categories:
Chapter 2: Server Board Overview
Chapter 3: Functional Architecture
Chapter 4: Technical Reference
Chapter 5: Connectors and Jumper Blocks
Chapter 6: Overview of BIOS Features
Chapter 7: BIOS Setup Program
Chapter 8: Error Reporting and Handling
Chapter 9: General Specifications

Server Board Overview S875WP1-E
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2. Server Board Overview
2.1 S875WP1-E Feature Set
The Intel Server Board S875WP1-E provides the following feature set:
•Support for an Intel®Pentium®4 processor with hyper-threading technology in a µPGA478
socket.
•400/533/800 MHz System Bus
•Intel®875P chipset
−Intel®82875P Memory Controller Hub (MCH)
−Intel®82801ER I/O Controller Hub (ICH5-R)
−Intel®82802AC 8 Megabit Firmware Hub (FWH)
•Support for single-sided or double-sided dual inline memory module (DIMM) double-data
rate (DDR) memory providing up to 4 GB of system memory with four 184-pin DIMM
sockets.
−PC3200 (400 MHz): to run 400 MHz memory at full speed requires an Intel Pentium 4
processor with 800 MHz system bus frequency.
−PC2700 (333 MHz): to run 333 MHz memory at full speed requires an Intel Pentium 4
processor with 533 MHz system bus frequency.
Note: PC2700 (333 MHZ) memory will run at 320 MHz frequency when using an Intel
Pentium 4 processor with 800 MHz system bus frequency.
−PC2100 (266 MHZ): PC2100 (266 MHZ) memory may only be used with an Intel
Pentium 4 processor with 400 MHz or 533 MHz system bus frequency only.
•One AGP bus with AGP connector, supporting 1.5 V and 0.8V AGP cards at 4X and 8X.
•One independent PCI bus (32-bit, 33 MHz, 5 V) with three PCI connectors and two
embedded devices:
−Integrated 2D/3D graphics controller: ATI Rage* XL Video Controller with 8 MB of
SDRAM
−Optional 4-port Serial ATA (SATA) controller (on S875WP1LX): Promise Technology*
PDC20319
•LPC (Low Pin Count) bus segment with one embedded device: SMSC LPC47M172 LPC
Bus I/O controller controller chip providing all PC-compatible I/O (floppy, serial, keyboard,
mouse)
•Four external USB 2.0 ports on the back panel with an additional internal header, which
provides support for an additional two USB ports for front panel support (six total possible
USB 2.0 ports)
•One serial port and one serial port header
•One parallel port
•Two IDE interfaces with UDMA 33, ATA-66/100 support
•Support for up to four system fans and one processor fan

S875WP1-E Server Board Overview
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•Server System Infrastructure (SSI)-compliant connectors for SSI interface support: front
panel, power connector
•Hardware Monitor Subsystem:
−Voltage sense to detect out of range power supply voltages
−Thermal sense to detect out of range thermal values
−Four fan sense inputs used to monitor fan activity

Server Board Overview S875WP1-E
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The figure below shows the functional blocks of the server board and the plug-in modules that it
supports.
TP00182
ABC D E FG
I
J
K
L
M
N
O
P
QRT
U
V
W
Y
Z
AA
BB
CC
X
S
H
A. System Fan 4 Header
B. +12V CPU Power Connector
C. Processor Socket
D. CPU Fan
E. DIMM Sockets
F. Main Power Connector
G. Floppy Drive Connector
H. Auxiliary Power Connector
I. Primary IDE Connector
J. Secondary IDE Connector
K. Serial B Header
L. System Fan 1 Header
M. System Fan 2 Header
N. Front Panel Connector
O. BIOS Configuration Jumper (J8J2)
P. SCSI LED Header
Q. Hot Swap Backplane Header
R. Battery
S. SATA-A1 through SATA-A4 Connector
(S875WP1LX only, slots numbered from left to
right)
T. Chassis Intrusion Header
U. PCI 32/33 Slots 1 – 3
(slots numbered from top to bottom)
V. System Fan 3 Header
W. Front Panel USB Header
X. Clear CMOS Jumper J8G1
Y. SATA-B1 and SATA-B2 Connectors
(slots numbered from left to right)
Z. AGP Connector
AA. NIC2 (10/100 Mb), USB
BB. NIC1 (1 Gb), USB
CC. Back Panel I/O Ports
Figure 1. Intel Server Board S875WP1-E Diagram

S875WP1-E TPS Functional Architecture
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3. Functional Architecture
This chapter provides a high-level description of the functionality distributed between the
architectural blocks of the Intel Server Board S875WP1-E.
3.1 Processor and Memory Subsystem
The Intel 82875P Memory Controller Hub (MCH) is one component of the Intel 875P chipset.
The MCH is a centralized controller for the system bus, the memory bus, the AGP bus, and the
accelerated hub architecture interface.
3.1.1 Processor Support
The Intel Server Board S875WP1-E supports a single Pentium 4 processor (in a µPGA478
socket) with a system bus of 400 /533 /800 MHz. The server board supports the processors
listed in Table 1.
Table 1. Processor Support Matrix
Type Designation System Bus L2 Cache Size
Pentium® 4 processor with
Hyperthreading (HT) Technology 2.40, 2.60, 2.80, and 3.0 GHz 800 MHz 512 KB
Pentium 4 processor with
Hyperthreading Technology 3.06 GHz 533 MHz 512 KB
Pentium 4 processor 2.0, 2.26, 2.4, 2.53, 2.6, 2.66, and 2.8
GHz 400 / 533 MHz 512 KB
CAUTION
Use only the processors listed above. Use of unsupported processors can damage the board,
the processor, and the power supply. See the Intel® Server Board S875WP1-E Specification
Update or go to http://support.intel.com/support/motherboards/server/S875WP1-E/ for the
current list of supported processors for this board.

NOTE
Use only ATX12V or EPS12V compliant power supplies with the server board S875WP1-E.
ATX12V and EPS12V power supplies have an additional power lead that provides required
supplemental power for the Intel Pentium 4 processor. The board will not boot if you do not
connect the 20-pin (or 24-pin) and 4-pin (or 8-pin) leads of ATX12V or EPS12V power supplies
to the corresponding connectors.
Do not use a standard ATX power supply. The board will not boot with a standard ATX power
supply.

Functional Architecture S875WP1-E TPS
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3.1.1.1 Reset Configuration Logic
The BIOS determines the processor stepping, cache size, and other processor information
through the CPUID instruction. The requirement is for the processor to run at a fixed speed. The
processor cannot be programmed to operate at a lower or higher speed.
On the S875WP1-E platform, the BIOS is responsible for configuring the processor speed. The
BIOS uses CMOS settings to determine which speed to program into the speed setting device.
The processor information is read at every system power-on.
3.1.2 Memory Subsystem
The server board S875WP1-E provides four DIMM slots and supports a maximum memory
capacity of 4 GB. The DIMM organization is x72, which includes eight ECC check bits. ECC from
the DIMMs are passed through to the processor’s system bus. Memory scrubbing, single-bit
error correction and multiple-bit error detection is supported. Memory can be implemented with
either single-sided (one row) or double-sided (two row) DIMMs.
Table 2. Supported Memory Configurations
DIMM Capacity Configuration DDR SDRAM
Density DDR SDRAM Organization
Front-side/Back-side
Number of DDR
SDRAM Devices
64 MB SS 64 Mbit 8 M x 8/empty 8
64 MB SS 128 Mbit 8 M x 16/empty 4
128 MB DS 64 Mbit 8 M x 8/8 M x 8 16
128 MB SS 128 Mbit 16 M x 8/empty 8
128 MB SS 256 Mbit 16 M x 16/empty 4
256 MB DS 128 Mbit 16 M x 8/16 M x 8 16
256 MB SS 256 Mbit 32 M x 8/empty 8
256 MB SS 512 Mbit 32 M x 16/empty 4
512 MB DS 256 Mbit 32 M x 8/32 M x 8 16
512 MB SS 512 Mbit 64 M x 8/empty 8
1024 MB DS 512 Mbit 64 M x 8/64 M x 8 16
Note: In the second column, “DS” refers to double-sided memory modules (containing two rows of DDR
SDRAM) and “SS” refers to single-sided memory modules (containing one row of DDR SDRAM).
DIMM and memory configurations must adhere to the following:
•2.5 V (only) 184-pin DDR SDRAM DIMMs with gold-plated contacts
•Unbuffered, single-sided or double-sided DIMMs with the following restriction:
•Double-sided DIMMS with x16 organization are not supported.
•Maximum total system memory: 4 GB
•Minimum total system memory: 128 MB
•ECC and non-ECC DIMMs supported
•Serial Presence Detect
•PC3200 (400 MHZ), PC2700 (333 MHZ), and PC2100 (266 MHZ) SDRAM DIMMs

S875WP1-E TPS Functional Architecture
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Table 3 lists the supported system bus frequency and memory speed combinations.
Table 3. Supported System Bus Frequency and Memory Speed Combinations
To use this type of DIMM… The processor's system bus frequency must be…
PC3200 (400 MHZ) 800 MHz
PC2700 (333 MHZ) 800 or 533 MHz (Note)
PC2100 (266 MHZ) 800, 533, or 400 MHz
Note: When using PC2700 (333 MHZ) memory with an 800 MHz system bus frequency processor, the memory
channel will be set to 320 MHz.
Only DIMMs tested and qualified by Intel or a designated memory test vendor will be supported
on the Intel Server Board S875WP1-E. A list of qualified DIMMs will be made available through
http://support.intel.com/support/motherboards/server/S875WP1-E/ . Note that all DIMMs are
supported by design, but only fully qualified DIMMs will be supported.

NOTES
•Remove the AGP video card while installing or upgrading memory to avoid interference
with the memory retention mechanism.
•To be fully compliant with all applicable DDR SDRAM memory specifications, the board
should be populated with DIMMs that support the Serial Presence Detect (SPD) data
structure. This allows the BIOS to read the SPD data and program the chipset to
accurately configure memory settings for optimum performance. If non-SPD memory is
installed, the BIOS will attempt to correctly configure the memory settings, but
performance and reliability may be impacted or the DIMMs may not function under the
determined frequency.
•For ECC functionality, all installed DIMMs must be ECC. If both ECC and non-ECC
DIMMs are used, ECC will be disabled and will not function.
•Only low profile DIMMs can be supported in a 1U server chassis.
3.1.3 Memory Configurations
The Intel 82875P MCH component provides two features for enhancing memory throughput:
•Dual Channel memory interface. The board has two memory channels, each with two
DIMM sockets.
•Dynamic Addressing Mode. Dynamic mode minimizes overhead by reducing memory
accesses.

Functional Architecture S875WP1-E TPS
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Table 4 summarizes the characteristics of dual and single channel configurations with and
without the use of Dynamic Mode.
Table 4. Characteristics of Dual/Single Channel Configuration with/without Dynamic Mode
Throughput
Level Configuration Characteristics
Highest Dual Channel with Dynamic Mode All DIMMs matched
(Example configurations are shown in Figure 2)
Dual Channel without Dynamic Mode DIMMs matched from Channel A to Channel B
DIMMs not matched within channels
(Example configuration is shown in Figure 3)
Single Channel with Dynamic Mode Single DIMM or DIMMs matched with a channel
(Example configurations are shown in Figure 4)
Lowest Single Channel without Dynamic Mode DIMMs not matched
(Example configurations are shown in Figure 5)