Dell OptiPlex 745c (Early 2007) User Manual
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Memory
Dell™ OptiPlex™ 745c User's Guide
Addressing Memory With 4-GB or Greater Configurations (32-bit Operating Systems Only)
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:
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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:
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A pair of matched memory modules installed in connectors DIMM1 and DIMM2
or
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A memory module installed in connector DIMM1
or
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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.
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.
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).