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 Memory

Dell™OptiPlex™745cUser'sGuide

DDR2 Memory Overview

Addressing Memory With 4-GB or Greater Configurations (32-bit Operating Systems Only)

Removing Memory

Installing Memory

Your computer supports non-ECC DDR2 memory only. For more information on the type of memory supported by your computer, see the "Memory" section for

the specifications of your computer:

l Mini Tower 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:

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

l A memory module installed in connector DIMM1

l For the mini tower computers only, a pair of matched memory modules installed in connectors DIMM1 and DIMM2 and another matched pair installed in

connectors DIMM3 and DIMM4

Be sure to install a single memory module in DIMM1, the connector closest to the processor, before you install modules in the other connectors.

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Mini Tower Form Factor Matched Pairs

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

NOTICE: Do not install ECC memory modules. Doing so may cause the system not to boot or otherwise impact performance.

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

NOTE: The mini tower computer has four slots.

matched pair of memory modules in connectors DIMM1 and DIMM2 (white securing clips)

matched pair of memory modules in connectors DIMM3 and DIMM4 (black securing clips).