Dell OptiPlex GX270 - Manual (Page 47)

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Memory
Dell™ OptiPlex™ GX270 Systems User's Guide
Memory Installation Guidelines
For information on the type of memory supported by your computer, look under " Memory " in the Technical Specifications section.
DDR Memory Overview
DDR memory modules should be installed in pairs of matched memory size, speed, and technology. If the DDR memory modules are not installed in matched
pairs, the computer will continue to operate, but with a slight reduction in performance.
The recommended memory configurations are:
l A memory module installed in connector DIMM_1
or
l A pair of matched memory modules installed in connectors DIMM_1 and DIMM_2
or
l A pair of matched memory modules installed in connectors DIMM_1 and DIMM_2 and another matched pair installed in connectors DIMM_3 and DIMM_4
l If you install mixed pairs of PC2700 (DDR 333-MHz) and PC3200 (DDR 400-MHz) memory, the modules function at the slowest speed installed.
l Be sure to install a single memory module in DIMM_1, the connector closest to the processor, before you install modules in the other connectors.
l The actual speed of the SDRAM memory channel will depend on the speed of the processor's front side bus.
Installing Memory in the Small Desktop and Small Mini-Tower Computers
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: Always install DDR memory modules in the order indicated on the system board.
NOTICE: Do not install ECC memory modules.
A matched pair of memory modules in connectors
DIMM_1 and DIMM_2 (white securing clips)
B matched pair of memory modules in connectors
DIMM_3 and DIMM_4 (black securing clips)
NOTE: The small form-factor computer has two memory module connectors: DIMM_1 (channel A) and DIMM_2 (channel B).
NOTE: Memory purchased from Dell is covered under your computer warranty.
NOTICE: If you remove your original memory modules from the computer during a memory upgrade, keep them separate from any new modules that
you may have, even if you purchased the new modules from Dell. If possible, do not pair an original memory module with a new memory module.