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Removing and Installing Parts

Dell™ Dimension™ C521 Service Manual

Memory

Battery

Cards

Processor

Drives

Power Supply

CD/DVD Drive

Front I/O Panel

Floppy Drive

Fan Assembly

Media Card Reader

System Board

Hard Drive

 

 

 

Memory

If your computer only has one memory module installed on the system board, you can increase your computer memory by installing an additional memory module.

Your computer supports DDR2 memory. For additional information on the type of memory supported by your computer, see Specifications.

DDR2 Memory Overview

Your computer has a minimum memory configuration of one DDR2 memory module. This memory module must be installed in DIMM1. If two or more DDR2 memory modules are installed, they should be installed in pairs of matched memory size, speed, and technology. If the DDR2 memory modules are not installed in matched pairs, the computer will continue to operate, but with a slight reduction in performance. See the label on the module to determine the module's capacity.

NOTE: Always install DDR2 memory modules in the order indicated on the system board.

NOTICE: Do not install ECC or buffered memory modules. Only unbuffered, non-ECC memory is supported.

The recommended memory configurations are:

A memory module installed in connector DIMM1

A pair of matched memory modules installed in connectors DIMM1 and DIMM2

A pair of matched memory modules installed in connectors DIMM1 and DIMM2 and another matched pair installed in connectors DIMM3 and DIMM4

If you install mixed pairs of DDR2 533-MHz (PC2-4300) and DDR2 667-MHz (PC2-5400) memory, the modules function at the slower installed speed.

Be sure to populate the memory modules in order starting with DIMM1, the connector closest to the edge of the system board, before you install modules in the other connectors.

1

Channel A: matched pair of memory modules in connectors DIMM_1 and DIMM_2 (white securing clips)

2

Channel B: matched pair of memory modules in connectors DIMM_3 and DIMM_4 (black securing clips)

NOTE: Memory purchased from Dell is covered under your computer warranty.

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Dell C521 specifications Removing and Installing Parts, DDR2 Memory Overview