Dell manual Memory

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 Memory
Dell™Optiplex™740Systems
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 of
the specifications for your computer:
lMini Tower Computer (Model #DCSM) Specifications
lDesktop Computer (Model # DCNE) Specifications
lSmall Form Factor Computer (Model # DCCY) 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
or
lA memory module installed in connector DIMM1
or
l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 edge of the system board, before you install modules in the other
connectors.

Mini Tower, Desktop, and Small 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.
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).