Ddr2 Memory Overview; Addressing Memory With 4-Gb Configurations - Dell GX280DT - GX280 Desktop Computer User Manual

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Memory
Dell™ OptiPlex™ GX280 Systems User's Guide
DDR2 Memory Overview
Addressing Memory With 4-GB Configurations
Replacing/Adding Additional Memory
For information on the type of memory supported by your computer, look under "Memory" in "Specifications."
NOTICE: Before you install new memory modules, download the most recent BIOS for your computer from the Dell Support website at
support.dell.com.
DDR2 Memory Overview
Dual-channel DDR2 memory modules should be installed in pairs of matched memory size, speed, and technology. If the DDR2 memory modules are not
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installed in matched pairs, 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.
NOTE: Always install DDR2 memory modules in the order indicated on the system board.
The recommended memory configurations are:
A memory module installed in connector DIMM1
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or
A pair of matched memory modules installed in connectors DIMM1 and DIMM2
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or
A pair of matched memory modules installed in connectors DIMM1 and DIMM2 and another matched pair installed in connectors DIMM3 and DIMM4
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NOTICE: Do not install ECC memory modules. Doing so may cause the system not to boot or affect performance.
Be sure to install a single memory module in DIMM1, the connector closest to the processor, before you install modules in the other connectors.
NOTE: The small form-factor computer has two slots which are considered an interleaved pair.
A matched pair of memory modules in connectors DIMM1 and DIMM2 (white securing clips)
B matched pair of memory modules in connectors DIMM3 and DIMM4 (black securing clips)
Addressing Memory With 4-GB Configurations
The small-desktop, desktop, small mini-tower, and mini-tower computers support 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