Dell OptiPlex GX270 Manuel d'utilisateur Page 48
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Addressing Memory With 4-GB Configurations
Your computer supports a maximum of 4 GB of memory when you use four 1-GB DIMMs. Current operating systems, such as Microsoft®Windows®2000 and
Windows XP, can only use a maximum of 4 GB of address space; however, the amount of memory available to the operating system is slightly less than 4 GB.
Certain components within the computer require address space in the 4-GB range. Any address space reserved for these components cannot be used by
computer memory.
The following components require memory address space:
l System ROM
l APIC(s)
l Integrated PCI devices, such as network connectors
l PCI and AGP cards
l The AGP aperture size specified in system setup
At start-up, the BIOS identifies the components that require address space. The BIOS dynamically calculates the amount of reserved address space required.
The BIOS then subtracts the reserved address space from 4 GB to determine the amount of usable space.
l If the total installed computer memory is less than the usable space, all installed computer memory is available for use only by the operating system.
l If the total installed computer memory is equal to or greater than the usable address space, a small portion of installed memory is available for use by
the operating system.
Installing Memory
1. Shut down the computer through the Start menu.
2. Ensure that your computer and attached devices are turned off. If your computer and attached devices did not automatically turn off when you shut
down your computer, turn them off now.
3. Disconnect any telephone or telecommunication lines from the computer.
4. Disconnect your computer and all attached devices from their electrical outlets, and then press the power button to ground the system board.
5. Remove the computer stand, if it is attached.
6. Open the computer cover.
7. Press out the securing clip at each end of the memory module connector.
Otherwise, your computer may not start properly.
CAUTION: Before you begin any of the procedures in this section, follow the steps in "Safety Instructions."
CAUTION: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of
your computer's electronic components. You can do so by touching an unpainted metal surface on the computer chassis.
NOTICE: To disconnect a network cable, first unplug the cable from your computer and then unplug it from the network wall jack.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.
NOTICE: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface, such as the metal at the back of the
computer. While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm internal components.
1
memory connector closest to microprocessor
- Abbreviations and Acronyms 2
- Advanced Troubleshooting 3
- Reinstalling Drivers 4
- Windows 2000 5
- Creating a Restore Point 6
- Before You Reinstall 6
- Reinstalling Windows XP 7
- Microsoft Windows XP 8
- Advanced Features 10
- Security 11
- Password Protection 11
- Assigning a System Password 12
- Typing Your System Password 12
- Setup Password 13
- System Setup 14
- Boot Sequence 15
- System Setup Options 16
- Booting to a USB Device 18
- Jumper Settings 18
- Power Button 19
- Hyper-Threading 19
- Power Management 20
- Battery 21
- Cleaning Your Computer 23
- Closing the Computer Cover 24
- Ergonomic Computing Habits 25
- Back to Contents Page 26
- Operating System CD 28
- Getting Help 29
- AutoTech Service 30
- Problems With Your Order 31
- Product Information 31
- Before You Call 31
- Contacting Dell 32
- Glossary 40
- DDR Memory Overview 47
- Installing Memory 48
- Removing Memory 50
- Regulatory Notices 51
- IC Notice (Canada Only) 52
- CE Notice (European Union) 52
- ENERGY STAR®Compliance 52
- VCCI Notice (Japan Only) 53
- Class A Device 54
- Class B Device 54
- BSMI Notice (Taiwan Only) 55
- SAFETY: General 57
- SAFETY: Battery Disposal 59
- PCI Cards 101
- Removing a PCI Card 103
- Serial Port Adapters 104
- Opening the Computer Cover 106
- Connecting Drive Cables 107
- Drive Interface Connectors 108
- Power Cable Connector 108
- Hard Drive 109
- Removing a Hard Drive 110
- Installing a Hard Drive 110
- Front-Panel Inserts 112
- Floppy Drive 112
- Removing a Floppy Drive 113
- Installing a Floppy Drive 114
- CD/DVD Drive 115
- Installing a CD/DVD Drive 116
- Cable Routing 117
- Microprocessor 119
- About Your Computer 124
- Back View 125
- Inside Your Computer 126
- System Board Components 127
- AGP and DVI Adapter Cards 129
- Adding a Second Hard Drive 142
- Removing a CD/DVD Drive 148
- Solving Problems 156
- Beep Codes 157
- System Lights 158
- Battery Problems 158
- Card Problems 158
- Drive Problems 159
- CD drive problems 160
- DVD drive problems 160
- Hard drive problems 160
- Dropped or Damaged Computer 161
- Error Messages 161
- General Problems 163
- A solid blue screen appears 164
- Other software problems 164
- Other technical problems 164
- General hardware problems 164
- Keyboard Problems 165
- Memory Problems 165
- Mouse Problems 165
- Network Problems 166
- Power Problems 166
- Printer Problems 167
- Sound and Speaker Problems 168
- System Board Problems 168
- Video and Monitor Problems 169
- Specifications 171
- May20048Y945Rev.A02 175
- Warranty and Return Policy 176
- Adding User Accounts 177
- Fast User Switching 178
- Network Setup Wizard 178
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