
Intel Desktop Board D975XBX Technical Product Specification 
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2Technical Reference 
2.1 Memory Resources......................................................................................................47 
2.1.1 Addressable Memory.....................................................................................47 
2.1.2 Memory Map..................................................................................................49 
2.2 DMA Channels.............................................................................................................49 
2.3 Fixed I/O Map...............................................................................................................50 
2.4 PCI Configuration Space Map......................................................................................51 
2.5 Interrupts......................................................................................................................52
2.6 PCI Conventional Interrupt Routing Map .....................................................................53 
2.7 Connectors...................................................................................................................55 
2.7.1 Back Panel Connectors.................................................................................55 
2.7.2 Component-side Connectors.........................................................................58 
2.8 Jumper Block ...............................................................................................................69 
2.9 Mechanical Considerations..........................................................................................70 
2.9.1 Form Factor...................................................................................................70 
2.9.2 I/O Shield.......................................................................................................71 
2.10 Electrical Considerations..............................................................................................73 
2.10.1 DC Loading....................................................................................................73 
2.10.2 Add-in Board Considerations.........................................................................73 
2.10.3 Fan Connector Current Capability.................................................................74 
2.10.4 Power Supply Considerations .......................................................................74 
2.11 Thermal Considerations...............................................................................................75 
2.12 Reliability......................................................................................................................77 
2.13 Environmental..............................................................................................................78 
2.14 Regulatory Compliance................................................................................................79 
2.14.1 Safety Regulations ........................................................................................79 
2.14.2 European Union Declaration of Conformity Statement..................................79 
2.14.3 Product Ecology Statements.........................................................................81 
2.14.4 EMC Regulations...........................................................................................84 
2.14.5 Product Certification Markings (Board Level)................................................86 
3Overview of BIOS Features 
3.1 Introduction ..................................................................................................................87
3.2 Resource Configuration ...............................................................................................88 
3.2.1 PCI Autoconfiguration....................................................................................88 
3.2.2 PCI IDE Support............................................................................................88 
3.3 System Management BIOS (SMBIOS) ........................................................................89 
3.4 Legacy USB Support....................................................................................................89 
3.5 BIOS Updates..............................................................................................................90 
3.5.1 Language Support.........................................................................................90 
3.5.2 Custom Splash Screen..................................................................................90 
3.6 Boot Options ................................................................................................................91 
3.6.1 CD-ROM Boot ...............................................................................................91 
3.6.2 Network Boot.................................................................................................91 
3.6.3 Booting Without Attached Devices................................................................91 
3.6.4 Changing the Default Boot Device During POST..........................................91 
3.7 BIOS Security Features ...............................................................................................92