Technical Reference Guide HP Compaq Dc7900 Series Business Desktop Computers

Technical Reference Guide HP Compaq dc7900 Series Business Desktop Computers Document Part Number: 506665-001 September 2008 This document provides information on the design, architecture, function, and capabilities of the HP Compaq dc7900 Series Business Desktop Computers. This information may be used by engineers, technicians, administrators, or anyone needing detailed information on the products covered. © Copyright 2008 Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice. Microsoft, MS-DOS, Windows, and Windows NT are trademarks of Microsoft Corporation in the U.S. and other countries. Intel, Intel Core 2 Duo, Intel Core 2 Quad, Pentium Dual-Core, Intel Inside, and Celeron are trademarks of Intel Corporation in the U.S. and other countries. Adobe, Acrobat, and Acrobat Reader are trademarks or registered trademarks of Adobe Systems Incorporated. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. HP shall not be liable for technical or editorial errors or omissions contained herein. This document contains proprietary information that is protected by copyright. No part of this document may be photocopied, reproduced, or translated to another language without the prior written consent of Hewlett-Packard Company. Technical Reference Guide HP Compaq dc7900 Series Business Desktop Computers First Edition (September 2008) Document Part Number: 506665-001 Contents 1Introduction 1.1 About this Guide . 1–1 1.1.1 Online Viewing . 1–1 1.1.2 Hardcopy . 1–1 1.2 Additional Information Sources . 1–1 1.3 Model Numbering Convention . 1–1 1.4 Serial Number . 1–3 1.5 Notational Conventions . 1–3 1.5.1 Special Notices. 1–3 1.5.2 Values. 1–3 1.5.2 Ranges . 1–3 1.6 Common Acronyms and Abbreviations . 1–4 2 System Overview 2.1 Introduction . 2–1 2.2 Features . 2–2 2.3 System Architecture . 2–4 2.3.1 Intel Processor Support . 2–6 2.3.2 Chipset . 2–7 2.3.3 Support Components . 2–8 2.3.4 System Memory . 2–8 2.3.5 Mass Storage . 2–9 2.3.6 Serial Interface . 2–9 2.3.7 Universal Serial Bus Interface . 2–9 2.3.8 Network Interface Controller . 2–9 2.3.9 Graphics Subsystem . 2–10 2.3.10 Audio Subsystem . 2–10 2.4 Specifications. 2–11 Technical Reference Guide www.hp.com iii Contents 3 Processor/Memory Subsystem 3.1 Introduction . 3–1 3.2 Intel Processors . 3–2 3.2.1 Intel Processor Overview . 3–2 3.2.2 Processor Changing/Upgrading . 3–3 3.3 Memory Subsystem . 3–4 3.3.1 Memory Upgrading . 3–5 3.3.2 Memory Mapping and Pre-allocation . 3–5 4 System Support 4.1 Introduction . 4–1 4.2 PCI Bus Overview. 4–1 4.2.1 PCI 2.3 Bus Operation . 4–1 4.2.2 PCI Express Bus Operation . 4–3 4.2.3 Option ROM Mapping . 4–4 4.2.4 PCI Interrupts . 4–4 4.2.5 PCI Power Management Support. 4–4 4.2.6 PCI Connectors. 4–5 4.3 System Resources . 4–7 4.3.1 Interrupts . 4–7 4.3.2 Direct Memory Access. 4–8 4.4 Real-Time Clock and Configuration Memory. 4–9 4.4.1 Clearing CMOS . 4–9 4.4.2 Standard CMOS Locations. 4–10 4.5 System Management . 4–10 4.5.1 Security Functions . 4–10 4.5.2 Power Management . 4–12 4.5.3 System Status . 4–12 4.5.4 Thermal Sensing and Cooling . 4–13 4.6 Register Map and Miscellaneous Functions . 4–14 4.6.1 System I/O Map . 4–14 4.6.2 GPIO Functions . 4–16 5 Input/Output Interfaces 5.1 Introduction . 5–1 5.2 SATA/eSATA Interface . 5–2 5.5.1 SATA Inteerface. ..

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