ptg5994185 From the Library of Ross Hagglund Contents at a Glance Introduction 1 1 Development of the PC 5 2 PC Components, Features, and System Design 19 3 Processor Types and Specifications 31 4 Motherboards and Buses 171 5 BIOS 313 6 Memory 375 UPGRADING 7 The ATA/IDE Interface 435 8 Magnetic Storage Principles 489 AND 9 Hard Disk Storage 513 10 Removable Storage 557 REPAIRING PC , 11 Optical Storage 585 S 12 Video Hardware 671 13 Audio Hardware 739 19th Edition 14 External I/O Interfaces 765 15 Input Devices 801 16 Internet Connectivity 837 17 Local Area Networking 865 ptg5994185 18 Power Supplies 913 19 Building or Upgrading Systems 997 20 PC Diagnostics, Testing, and Maintenance 1033 Index 1093 Scott Mueller 800 East 96th Street Indianapolis, Indiana 46240 Download at WoweBook.Com From the Library of Ross Hagglund Upgrading and Repairing PCs, 19th Edition Associate Publisher Greg Wiegand Copyright © 2010 by Pearson Education, Inc. All rights reserved. No part of this book shall be reproduced, stored in a retrieval Acquisitions Editor system, or transmitted by any means, electronic, mechanical, photocopying, record- Rick Kughen ing, or otherwise, without written permission from the publisher. No patent liability is assumed with respect to the use of the information contained herein. Although Development Editor every precaution has been taken in the preparation of this book, the publisher and Todd Brakke author assume no responsibility for errors or omissions. Nor is any liability assumed for damages resulting from the use of the information contained herein. Managing Editor ISBN-13: 978-0-7897-3954-4 Kristy Hart ISBN-10: 0-7897-3954-2 Library of Congress Cataloging-in-Publication Data: Project Editor Jovana San Nicolas-Shirley Mueller, Scott. Upgrading and repairing PCs / Scott Mueller. — 19th ed. Copy Editor p. cm. ISBN 978-0-7897-3954-4 Bart Reed 1. Microcomputers—Maintenance and repair. 2. Microcomputers—Equipment and supplies. 3. Microcomputers—Upgrading. I. Title. Indexer TK7887.M84 2010 Erika Millen 004.16—dc22 2009042724 Proofreader Printed in the United States of America Linda Seifert First Printing: December 2009 Technical Editor Trademarks Mark Reddin ptg5994185 All terms mentioned in this book that are known to be trademarks or service marks Publishing Coordinator have been appropriately capitalized. Que Publishing cannot attest to the accuracy of Cindy Teeters this information. Use of a term in this book should not be regarded as affecting the validity of any trademark or service mark. Multimedia Developer Warning and Disclaimer Dan Scherf Every effort has been made to make this book as complete and as accurate as possi- Book Designer ble, but no warranty or fitness is implied. The information provided is on an “as is” Ann Jones basis. The author and the publisher shall have neither liability nor responsibility to any person or entity with respect to any loss or damages arising from the informa- tion contained in this book or from the use of the DVD or programs accompanying Compositor it. Nonie Ratcliff Bulk Sales Que Publishing offers excellent discounts on this book when ordered in quantity for bulk purchases or special sales. For more information, please contact U.S. Corporate and Government Sales 1-800-382-3419 [email protected] For sales outside of the U.S., please contact International Sales [email protected] Download at WoweBook.Com From the Library of Ross Hagglund Contents Dual Independent Bus Architecture 74 Hyper-Threading Technology 75 Multicore Technology 76 Introduction 1 Processor Manufacturing 77 Processor Re-marking 82 Book Objectives 1 PGA Chip Packaging 83 The 19th Edition DVD-ROM 2 Single Edge Contact and Single Edge My Website: informit.com/upgrading 2 Processor Packaging 84 A Personal Note 3 Processor Socket and Slot Types 86 1 Development of the PC 5 Socket 370 (PGA-370) 89 Socket 423 91 Computer History: Before Personal Socket 478 91 Computers 5 Socket LGA775 91 Timeline 5 Socket LGA1156 92 Electronic Computers 10 Socket LGA1366 93 Modern Computers 10 Socket A (Socket 462) 94 From Tubes to Transistors 11 Socket 754 95 Integrated Circuits 13 Socket 939 and 940 95 History of the PC 13 Socket AM2/AM2+/AM3 96 Birth of the Personal Computer 13 Socket F (1207FX) 98 The IBM Personal Computer 14 CPU Operating Voltages 98 The PC Industry Nearly 30 Years Later 15 Math Coprocessors (Floating-Point 2 PC Components, Features, Units) 99 and System Design 19 Processor Bugs and Steppings 100 Processor Code Names 100 What Is a PC? 19 P1 (086) Processors 101 ptg5994185 Who Controls PC Software? 20 P2 (286) Processors 102 Who Controls PC Hardware? 23 P3 (386) Processors 103 White-Box Systems 25 386DX Processors 104 PC Design Guides 26 386SX Processors 104 System Types 27 386SL Processors 105 System Components 28 P4 (486) Processors 105 486DX Processors 106 3 Processor Types and 486SL 107 Specifications 31 DX2/OverDrive and DX4 Processors 107 Microprocessor History 31 AMD 486 (5x86) 108 The First Microprocessor 31 P5 (586) Processors 108 PC Processor Evolution 34 First-Generation Pentium Processors 110 16-bit to 64-bit Architecture Second-Generation Pentium Evolution 36 Processors 110 Processor Specifications 37 Pentium-MMX Processors 112 Data I/O Bus 42 Pentium Defects 113 Address Bus 43 AMD-K5 114 Internal Registers (Internal Data Bus) 44 Intel P6 (686) Processors 114 Processor Modes 45 Pentium Pro Processors 115 Processor Benchmarks 49 Pentium II Processors 117 Comparing Processor Performance 49 Pentium III 121 Cache Memory 64 Celeron 123 Processor Features 69 Intel Pentium 4 Processors 124 System Management Mode (SMM) 69 Pentium 4 Extreme Edition 127 Superscalar Execution 70 Intel Pentium D and Pentium Extreme MMX Technology 71 Edition 128 Dynamic Execution 73 Download at WoweBook.Com From the Library of Ross Hagglund iv Contents Intel Core Processors 130 Intel 915 Family 220 Intel Core 2 Family 130 Intel 925X Family 221 Intel Nehalem (Core i) Processors 133 Intel 945 Express Family 221 AMD K6 Processors 135 Intel 955X and 975X Family 222 NexGen Nx586 135 Intel 96x Series 222 AMD-K6 Series 136 Intel 3x and 4x Series Chipsets 223 AMD K7 Processors 137 Intel 5x Series Chipsets 226 AMD Athlon 137 Third-party Chipsets for Intel Processors 229 AMD Duron 138 SiS Chipsets 229 AMD Athlon XP 138 ULi Electronics Chipsets 232 Athlon MP 139 ATI Chipsets 233 AMD K8 Processors 140 VIA Chipsets 236 AMD Athlon 64 and 64 FX 140 AMD Athlon Chipsets 238 AMD Sempron 143 AMD Chipsets 238 AMD Athlon X2, 64 X2, and 64 FX 144 VIA Chipsets for AMD 239 AMD K10 Processors (Phenom) 146 SiS Chipsets for AMD 242 Processor Upgrades 148 NVIDIA nForce Chipsets for AMD 245 Overclocking 148 ATI Radeon IGP Chipsets 247 Quartz Crystals 149 AMD Athlon 64 Chipsets 249 Modern PC Clocks 151 AMD 8000 (8151) Chipset 249 Overclocking Tips 153 ATI (AMD) 250 Bus Speeds and Multipliers 155 VIA Chipsets for Athlon 64 252 Processor Cooling 157 NVIDIA Chipsets for Athlon 64 253 Heatsinks 162 SiS Chipsets for Athlon 64 255 Liquid Cooling 162 Super I/O Chips 258 Thermally Advantaged Chassis 163 Motherboard Connectors 259 ptg5994185 Processor Troubleshooting Techniques 168 System Bus Types, Functions, and Features 269 4 Motherboards and Buses 171 The Processor Bus (Front-Side Bus) 275 Motherboard Form Factors 171 Calculating Processor Bus Speeds 278 Obsolete Form Factors 172 Types of I/O Buses 279 ATX and Other Modern Form The ISA Bus 280 Factors 182 The Micro Channel Bus 282 Processor Sockets/Slots 195 The EISA Bus 284 Chipsets 198 Local Buses (VESA, PCI, PCI Express, Chipset Evolution 198 AGP) 285 Intel Chipsets 200 System Resources 294 Intel Chipset Model Numbers 200 Interrupts 295 Intel Integrated Graphics DMA Channels 300 Architecture 201 I/O Port Addresses 301 AMD Chipsets 202 Resolving Resource Conflicts 304 Traditional North/South Bridge Using a System-Configuration Architecture 202 Template 306 Hub Architecture 204 Plug-and-Play Systems 309 High-speed North-South Bridge Motherboard Selection Criteria (Knowing Connections 205 What to Look For) 310 Intel’s Early 386/486 Chipsets 206 Chipset Documentation 312 Fifth-Generation (P5 Pentium Class) 5 BIOS 313 Chipsets 207 Sixth-Generation (P6 Pentium Pro/II/III BIOS Basics 313 Class) Chipsets 209 Motherboard ROM BIOS 317 Seventh/Eighth-Generation (Pentium 4/D, ROM Hardware 318 Core 2, and Core i) Chipsets 213 ROM Shadowing 320 Download at WoweBook.Com From the Library of Ross Hagglund This is the Current C–Head at the BOTTOMof the Page Contents v ROM Chip Types 320 DDR3 DIMM Details 408 ROM BIOS Manufacturers 324 RIMM Details 408 BIOS Hardware/Software 327 Determining a Memory Module’s Size Upgrading the BIOS 328 andFeatures 409 Where to Get Your BIOS Update 328 Memory Banks 412 Determining Your BIOS Version 329 Memory Module Speed 413 Checking the BIOS Date 329 Parity and ECC 413 Backing Up Your BIOS 330 Parity Checking 415 Backing Up Your BIOS Setup (CMOS RAM) How Parity Checking Works 416 Settings 330 Error-Correcting Code (ECC) 418 Upgrading a Flash BIOS 331 RAM Upgrades 419 Motherboard CMOS RAM Addresses 337 Upgrade Options and Strategies 419 Year 2000 BIOS Issues 340 Purchasing Memory 421 Preboot Environment 340 Replacing Modules with Higher-Capacity CMOS Setup Specifications 342 Versions 422 Running or Accessing the CMOS Setup Installing Memory Modules 423 Program 342 Troubleshooting Memory 425 BIOS Setup Menus 342 Memory Defect Isolation Procedures 429 Maintenance Menu 343 The System Logical Memory Layout 432 Main Menu 344 7 The ATA/IDE Interface 435 Advanced Menus 345 Security Menu 360 An Overview of the IDE Interface 435 Power Menu 361 Precursors to IDE 435 Boot Menu (Boot Sequence, Order) 363 IDE Origins 436 Exit Menu 365 Origins of ATA 437 Additional BIOS Setup Features 365 ATA Standards 438 ptg5994185 Plug and Play BIOS 367 ATA-1 (AT Attachment Interface for Disk PnP Device IDs 367 Drives) 440 ACPI 368 ATA-2 (AT Attachment Interface with BIOS/MBR Error Messages 369 Extensions-2) 440 BIOS Boot Error Messages 370 ATA-3 (AT Attachment Interface-3) 441 MBR Boot Error Messages 372 ATA/ATAPI-4 (AT Attachment with Packet Interface Extension-4) 441 6 Memory 375 ATA/ATAPI-5 (AT Attachment with Memory Basics 375 PacketInterface-5) 442 ROM 377 ATA/ATAPI-6 (AT Attachment with DRAM 377 PacketInterface-6) 443 Cache Memory: SRAM 379 ATA/ATAPI-7 (AT Attachment with RAM Types and Performance 381 PacketInterface-7) 444 Fast Page Mode DRAM 383 ATA/ATAPI-8 445 Extended Data Out RAM (EDO) 384 Parallel ATA 445 SDRAM 385 Parallel ATA I/O Connector 445 DDR SDRAM 388 Parallel ATA I/O Cable 448 DDR2 SDRAM 390 Longer and/or Rounded Cables 450 DDR3 392 Parallel ATA Signals 450 RDRAM 393 Parallel ATA Dual-Drive Memory Modules 396 Configurations 451 SIMMs, DIMMs, and RIMMs 397 Parallel ATA PIO Transfer Modes 454 Registered Modules 402 Parallel ATA DMA Transfer Modes 455 SIMM Details 404 Serial ATA 456 SDR DIMM Details 406 Serial ATA Cables and Connectors 458 DDR DIMM Details 407 Serial ATA Configuration 460 DDR2 DIMM Details 407 Advanced Host Controller Interface (AHCI) 461 Download at WoweBook.Com From the Library of Ross Hagglund vi Contents This is the Chapter Title Serial ATA Transfer Modes 462 3 1/2" Drive 517 ATA Features 463 2 1/2" Drive 517 ATA Commands 463 1.8" Drive 517 ATA Security Mode 464 1" Drives 518 Host Protected Area 465 Hard Disk Drive Operation 518 ATA Packet Interface 466 The Ultimate Hard Disk Drive ATA Drive Capacity Limitations 467 Analogy 520 Prefixes for Decimal and Binary Tracks and Sectors 521 Multiples 467 Disk Formatting 524 BIOS Limitations 468 Basic Hard Disk Drive Components 529 CHS Versus LBA 470 Hard Disk Platters (Disks) 530 CHS/LBA and LBA/CHS Conversions 471 Recording Media 530 BIOS Commands Versus ATA Read/Write Heads 532 Commands 472 Head Actuator Mechanisms 534 CHS Limitations (the 528MB Barrier) 472 Air Filters 542 CHS Translation (Breaking the 528MB Hard Disk Temperature Acclimation 543 Barrier) 474 Spindle Motors 543 The 2.1GB and 4.2GB Barriers 477 Logic Boards 544 LBA-Assist Translation 478 Cables and Connectors 545 The 8.4GB Barrier 481 Configuration Items 546 The 137GB Barrier and Beyond 482 Hard Disk Features 546 Operating System and Other Software Capacity 546 Limitations 484 Performance 548 PATA/SATA RAID 485 Reliability 553 Cost 556 8 Magnetic Storage Principles 489 ptg5994185 10 Removable Storage 557 Magnetic Storage 489 History of Magnetic Storage 489 The Role of Removable-Media Drives 557 How Magnetic Fields Are Used to Store Flash Memory Media 557 Data 490 Magnetic Disk Media 557 Read/Write Head Designs 493 Magnetic Tape Media 558 Ferrite 494 Flash Memory Devices 558 Metal-In-Gap 494 Types of Flash Memory Devices 559 Thin-Film 495 Comparing Flash Memory Devices 564 Magneto-Resistive Heads 495 Flash Card Readers 566 Giant Magneto-Resistive Heads 497 Microdrive Technology 568 Head Sliders 498 High-Capacity Magnetic Storage Data-Encoding Schemes 500 Devices 569 FM Encoding 502 Floppy Disk Drives 569 MFM Encoding 502 1.44MB 3 1/2" Drives 570 RLL Encoding 502 Floppy Drive Interfaces 571 Encoding Scheme Comparisons 504 Drive Components 571 Partial-Response, Maximum-Likelihood How the Operating System Uses a Decoders 505 FloppyDisk 577 Capacity Measurements 505 Disk Change 578 Areal Density 506 Floppy Disk Media Types and Perpendicular Magnetic Recording 509 Specifications 579 Floppy Disk Care and Handling 581 9 Hard Disk Storage 513 Tape Drives 582 Definition of a Hard Disk 513 Disadvantages of Tape Backup Hard Drive Advancements 514 Drives 583 Form Factors 515 Advantages of Tape Backup Drives 583 5 1/4" Drive 516 Magneto-Optical Drives 584 Download at WoweBook.Com From the Library of Ross Hagglund This is the Current C–Head at the BOTTOMof the Page Contents vii 11 Optical Storage 585 12 Video Hardware 671 Optical Technology 585 Display Adapters and Monitors 671 CD-based Optical Technology 586 Video Display Adapters 672 CDs: A Brief History 586 Video Adapter Types 672 CD Construction and Technology 587 Integrated Video/Motherboard Mass-producing CDs 587 Chipsets 673 Writable CDs 599 Video Adapter Components 675 MultiRead Specifications 606 Identifying the Video and System DVD 607 Chipsets 677 DVD History 608 Video RAM 677 DVD Construction and Technology 609 The Digital-to-Analog Converter DVD Tracks and Sectors 610 (DAC) 681 Handling DVD Errors 614 Video Display Interfaces 681 DVD Capacity (Sides and Layers) 615 The System Interface 681 Data Encoding on the Disc 619 The Display Interface 683 Recordable DVD Standards 619 Digital Display Interfaces 687 Multiformat Rewritable DVD Drives 627 TV Display Interfaces 698 Blu-ray Disc (BD) 627 3D Graphics Accelerators 699 HD-DVD 629 How 3D Accelerators Work 699 Optical Disc Formats 630 Application Programming Interfaces 704 CD Formats 630 Dual-GPU Scene Rendering 706 DVD Formats and Standards 639 3D Chipsets 708 Optical Disc File Systems 642 Monitors 708 Ripping/Copying Discs 647 Display Specifications 708 “For Music Use Only” CD-R/RW LCD Technology 718 ptg5994185 Discs 648 CRT Display Technology 720 CD Copy Protection 649 Plasma Display Technology 723 CD Digital Rights Management LCD and DLP Projectors 724 (DRM) 649 Using Multiple Monitors 725 DVD Copy Protection 650 Dualview 726 Optical Drive Performance Homogeneous Adapters 726 Specifications 652 Heterogeneous Adapters 727 CD Data Transfer Rate 652 Video Capture Devices 727 CD Drive Speed 653 Video Troubleshooting and DVD Drive Speed 656 Maintenance 730 Access Time 658 Troubleshooting Video Cards and Buffer/Cache 658 Drivers 730 Direct Memory Access and Video Drivers 732 Ultra-DMA 658 Maintaining Monitors 733 Interface 659 Testing Monitors 734 Loading Mechanism 659 Adjusting Monitors 735 Other Drive Features 660 Bad Pixels 736 Recording Software 660 Troubleshooting Monitors 737 How to Reliably Record Optical Repairing Monitors 738 Discs 661 13 Audio Hardware 739 Booting from a Floppy Disk with Optical Drive Support 662 Early PC Audio Adapters 739 Bootable Optical Discs—El Torito 662 Limitations of Sound Blaster Pro LightScribe and LabelFlash 663 Compatibility 740 Troubleshooting Optical Drives 663 DirectX and Audio Adapters 740 Caring for Optical Media 667 Legacy Audio Support Through Updating the Firmware in an Virtualization 740 Optical Drive 668 Download at WoweBook.Com From the Library of Ross Hagglund viii Contents This is the Chapter Title PC Multimedia History 741 Keyboard Technology 804 Audio Adapter Features 741 Keyswitch Design 804 Basic Connectors 742 The Keyboard Interface 810 Connectors for Advanced Features 744 Typematic Functions 811 Volume Control 745 Keyboard Key Numbers and Scan MIDI Support Features 746 Codes 813 Data Compression 746 International Keyboard Layouts 814 Multipurpose Digital Signal Keyboard/Mouse Interface Processors 747 Connectors 814 Sound Drivers 747 USB Keyboards 816 Sound Cards for Sound Producers 747 Keyboards with Special Features 817 Audio Adapter Concepts and Terms 748 Keyboard Troubleshooting and Repair 817 The Nature of Sound 748 Keyboard Disassembly 819 Evaluating the Quality of Your Audio Cleaning a Keyboard 819 Adapter 748 Keyboard Recommendations 820 Sampling 749 Pointing Devices 821 Motherboard Chipsets with Integrated Ball-Type Mice 822 Audio 750 Optical Mice 823 AC’97 Integrated Audio 750 Pointing Device Interface Types 825 Intel “Azalia” HD Audio 753 Mouse Troubleshooting 827 Installing a Sound Card 753 Scroll Wheels 828 Selecting an Expansion Slot 753 TrackPoint II/III/IV 829 Connecting PC Speakers and Completing Alternative Pointing Devices 831 the Installation 754 Wireless Input Devices 834 Using Your Stereo Instead of Power Management Features of Wireless Speakers 755 Input Devices 835 ptg5994185 Troubleshooting Sound Card Problems 755 Troubleshooting Wireless Input Hardware (Resource) Conflicts 756 Devices 836 Other Sound Card and Onboard Audio 16 Internet Connectivity 837 Problems 756 Speakers 760 Internet Connectivity Trends 837 Speaker Selection Criteria 760 Broadband Internet Access Types 837 Theater and Surround Sound Cable TV (CATV) 838 Considerations 762 Digital Subscriber Line (DSL) 841 Microphones 763 Wireless Broadband 845 Satellite Broadband 846 14 External I/O Interfaces 765 Integrated Services Digital Network Introduction to Input/Output Ports 765 (ISDN) 848 Serial Versus Parallel 765 Leased Lines 849 Universal Serial Bus (USB) 766 Comparing High-speed Internet IEEE 1394 (FireWire or i.LINK) 780 Access 850 Comparing USB and IEEE 1394 Dialup Modems 851 (FireWire) 784 Modem Standards and Protocols 852 Performance Myths and Realities 785 Bits and Baud Rates 853 Hot-Plugging (and Unplugging) 788 Modulation Standards 854 Low-speed External Connections 791 Error-Correction Protocols 855 Serial Ports 791 Data-Compression Standards 856 Parallel Ports 795 56Kbps Modems 856 Internet Connection Security 860 15 Input Devices 801 Having a Backup Plan in Case of Service Keyboards 801 Interruptions 860 Enhanced 101-Key Keyboard 802 Sharing Your Internet Connection 861 104-Key (Windows) Keyboard 803 Routers for Internet Sharing 861 Modem/Router Status LEDs 863 Download at WoweBook.Com From the Library of Ross Hagglund This is the Current C–Head at the BOTTOMof the Page Contents ix 17 Local Area Networking 865 ATX and Newer 934 PC/XT/AT and LPX Power Switches 935 Defining a Network 865 Motherboard Power Connectors 937 Types of Networks 866 AT/LPX Power Supply Connectors 937 Requirements for a Network 866 ATX and ATX12V Motherboard Power Client/Server Versus Peer Networks 867 Connectors 939 Client/Server Networks 867 Backward and Forward Peer-to-Peer Networks 868 Compatibility 952 Comparing Client/Server and Peer-to-Peer Dell Proprietary (Nonstandard) ATX Networks 869 Design 955 Network Architecture Overview 870 Additional Power Connectors 957 Wired Ethernet 871 Peripheral Power Connectors 958 Wireless Ethernet 873 Floppy Power Connectors 958 Which Wireless Ethernet Standard Serial ATA Power Connectors 960 Is Best? 878 PCI Express x16 Graphics Power Bluetooth 878 Connectors 961 Hardware Elements of Your Network 879 Power Supply Specifications 963 Network Interface Cards for Wired Power Supply Loading 963 Ethernet Networks 879 Power Supply Ratings 964 Network Cables for Wired Ethernet 882 Other Power Supply Specifications 966 Wired Network Topologies 890 Power Factor Correction 968 Switches and Hubs for Ethernet Power Supply Safety Certifications 969 Networks 892 Power-Use Calculations 970 Wireless Ethernet Hardware 897 Power Cycling 972 Network Protocols 902 Power Management 975 IP and TCP/IP 903 Energy Star Systems 975 ptg5994185 IPX 904 Advanced Power Management 976 NetBEUI 904 Advanced Configuration and Power Other Home Networking Solutions 905 Interface 976 HomePNA 905 Power Supply Troubleshooting 979 Powerline Networking 906 Overloaded Power Supplies 980 Putting Your Network Together 907 Inadequate Cooling 981 Network Adapters 907 Using Digital Multimeters 982 Cables and Connections Between Specialized Test Equipment 985 Computers 908 Obtaining Replacement Units 986 Hub/Switch/Access Point 909 Sources for Replacement Power Recording Information About Your Supplies 986 Network 909 Power-Protection Systems 987 Installing Networking Software 910 Surge Suppressors (Protectors) 989 Tips and Tricks 912 Phone Line Surge Protectors 989 Sharing Resources 912 Line Conditioners 990 Setting Up Security 912 Backup Power 990 Sharing Internet Connections 912 RTC/NVRAM (CMOS RAM) Batteries 993 18 Power Supplies 913 Modern CMOS Batteries 993 Obsolete or Unique CMOS Batteries 995 The Power Supply 913 CMOS Battery Troubleshooting 996 Primary Function and Operation 913 Positive DC Voltages 914 19 Building or Upgrading Negative DC Voltages 915 Systems 997 The Power Good Signal 916 System Components 997 Power Supply Form Factors 917 Case and Power Supply 999 Obsolete Form Factors 920 Processor 1000 Modern Form Factors 920 Motherboard 1001 Power Switches 934 Download at WoweBook.Com From the Library of Ross Hagglund