Chapter 2 Installing Server Options 29
■ In certain configurations, DIMMs will run slower than their individual
maximum speed. See
TABLE 2-3 for further details.
DIMM Rank Classification Labels
DIMMs come in a variety of ranks: single, dual, or quad. Each DIMM is shipped
with a label identifying its rank classification. TABLE 2-4 identifies the corresponding rank
classification label shipped with each DIMM.
▼ Install DIMMs
Caution – Ensure that all power is removed from the server before removing or
installing DIMMs, or damage to the DIMMs might occur. You must disconnect all
power cables from the system before performing this procedure.
1. Attach an antistatic wrist strap.
See “ESD Handling Procedure” on page 22.
TABLE 2-3 Memory Considerations and Limitations
1 DIMMs are available in two speeds: 1066 MHz and 1333 MHz
2 DIMM speed rules are as follows:
• 3x of the same kind of DIMMs per channel = 800 MHz
• 2x of the same kind of DIMMs per channel = 1333 MHz (for single-rank and
dual-rank DIMMs) or = 800 MHz (for quad-rank DIMMs)
• 1x of the same kind of DIMMs per channel = 1333 MHz (if using 1333 MHz
DIMMs)
*
• 1x of the same kind of DIMMs per channel = 1066 MHz (if using 1066 MHz
DIMMs)
* This DIMM configuration requires CPUs supporting 1333 MHz.
3 The system operates all memory only as fast as the slowest DIMM configuration.
TABLE 2-4 DIMM Classification Labels
Rank Classification Label
Quad-rank DIMM 4Rx4
Dual-rank DIMM 2Rx4
Single-rank DIMM 1Rx4
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