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Removing and Installing Parts
Dell™Dimension™C521ServiceManual
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.
The recommended memory configurations are:
l A memory module installed in connector DIMM1
l A pair of matched memory modules installed in connectors DIMM1 and DIMM2
l A pair of matched memory modules installed in connectors DIMM1 and DIMM2 and another matched pair installed in connectors DIMM3 and DIMM4
l 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.
Memory
Cards
Drives
CD/DVD Drive
Floppy Drive
Media Card Reader
Hard Drive
Battery
Processor
Power Supply
Front I/O Panel
Fan Assembly
System Board
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.
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.