26 Sun Fire X4170, X4270, and X4275 Servers Installation Guide • December 2009
4. Slide the top cover toward the rear of the server about a 0.5 inch (12 mm) [3].
5. Lift up and remove the top cover [4].
Installing Memory Modules (DIMMs)
Caution – This procedure requires that you handle components that are sensitive to
static discharge. This sensitivity can cause the component to fail. To avoid damage,
ensure that you follow antistatic practices as described in “Performing Electrostatic
Discharge and Antistatic Prevention Measures” on page 21.
The servers support a variety of DIMM configurations that can include quad-rank
(QR) DIMMs, dual-rank (DR) DIMMs, or single-rank (SR) DIMMs. When replacing
or upgrading a DIMM on the server you should consider the following:
■ Physical layout of the DIMMs and CPUs
For details, see “DIMM and CPU Physical Layout” on page 26.
■ DIMM population rules
For details, see “DIMM Population Rules” on page 28.
■ Instructions for installing a DIMM
For details, see “Install DIMMs” on page 29.
■ DIMM rank classifications labels
For details, see “DIMM Rank Classification Labels” on page 29.
DIMM and CPU Physical Layout
The physical layout of the DIMMs and CPUs is shown in FIGURE 2-3 and TABLE 2-2.
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