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Memory
Dell™ OptiPlex™ GX520 User's Guide
DDR2 Memory Overview
Addressing Memory With 4-GB Configurations
Removing Memory
Replacing/Adding Additional Memory
For information on the type of memory supported by your computer, see the "Memory" section of the specifications for your computer:
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Mini Tower Computer Specifications
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Desktop Computer Specifications
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Small Form Factor Computer Specifications
DDR2 Memory Overview
Dual-channel DDR2 memory modules should be installed in
pairs of matched memory size
. If the DDR2 memory modules are not installed with the same amount
of memory in each channel, the computer will continue to operate, but with a slight reduction in performance. See the label in the upper-right corner of the
module to determine the module's capacity.
The recommended memory configurations are:
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A pair of matched memory modules installed in connectors DIMM1 and DIMM2
or
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A memory module installed in connector DIMM1
Be sure to install a single memory module in DIMM1, the connector closer to the processor, before you install a module in the other connector.
Addressing Memory With 4-GB Configurations
This computer supports a maximum of 4 GB of memory when you use two 2-GB DIMMs. Current operating systems, such as Microsoft
®
Windows
®
XP, can only
use a maximum of 4 GB of address space; however, the amount of memory available to the operating system is 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:
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System ROM
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APIC(s)
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Integrated PCI devices, such as network connectors and SCSI controllers
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PCI cards
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Graphics card
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PCI Express cards (if applicable)
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.
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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.
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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.
NOTICE:
Before you install new memory modules, download the most recent BIOS for your computer from the Dell Support website at
support.dell.com
.
NOTE:
Always install DDR2 memory modules in the order indicated on the system board.
NOTICE:
Do not install ECC memory modules. Doing so may cause the system not to boot or affect performance.
Summary of Contents for OptiPlex GX520
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