Dell Dimension E520 - Manual (Page 69)

Removing and Installing Parts
69
Memory
You can increase your computer memory by installing memory modules on the system board.
Your computer supports DDR2 memory. For additional information on the type of memory supported by
your computer, see "Memory" on page 109.
DDR2 Memory Overview
DDR2 memory modules 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.
The recommended memory configurations are:
– A pair of matched memory modules installed in DIMM connectors 1 and 2
or
– A pair of matched memory modules installed in DIMM connectors 1 and 2 and another matched
pair installed in DIMM connectors 3 and 4
NOTICE:
Do not install ECC or buffered memory modules. Only unbuffered, non-ECC memory is supported.
• If you install mixed pairs of DDR2 533-MHz and DDR2 667-MHz memory, the modules function at
the slowest speed installed.
• Be sure to install a single memory module in DIMM connector 1, the connector closest to the
processor, before you install modules in the other connectors.