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100 Installing System Components
System Memory
You can upgrade your system memory to a maximum of 16 GB by installing
667MHz fully buffered (FB) DDR II memory modules in sets of 1-GB or
2-GB. The eight memory sockets are located on the system board under the
cooling shroud adjacent to the power supply bays. See Figure 6-2. You can
purchase memory upgrade kits from Dell.
NOTICE: If you remove your original memory modules from the system during a
memory upgrade, keep them separate from any new memory modules that you may
have, even if you purchased the new memory modules from Dell. Use only 667 MHz
DDR II FB-DIMMs.
The memory module sockets are divided into two equal branches (0 and 1).
Each branch consists of two channels:
• Channel 0 and channel 1 are in branch 0.
• Channel 2 and channel 3 are in branch 1.
Each channel consists of two DIMM sockets:
• Channel 0 contains DIMM_1, DIMM_5.
• Channel 1 contains DIMM _2, DIMM_6.
• Channel 2 contains DIMM_3, DIMM_7.
• Channel 3 contains DIMM _4, DIMM _8.
The first DIMM socket of each channel has white release tabs.
General Memory Module Installation Guidelines
To ensure optimal performance of your system, observe the following
guidelines when configuring your system memory.
• Use only qualified Fully-Buffered DIMMs (FBDs). FBDs can be either
s
ingle-ranked
or d
ual-ranked
. FBDs m
arked with a 1R are single
-r
anked
and modules marked with a 2R are dual
-r
anked.
• A minimum of two identical FBDs must installed.
• DIMM sockets must be populated by lowest number first.
• FBDs m
ust be installed in pairs of matched memory size, speed, and
technology
, and the total number of FBDs in the configuration must total
two, four, or eight. For best system performance, all four, or eight FBDs
should be identical memory size, speed, and technology.
Book.book Page 100 Monday, September 14, 2009 12:57 PM